CN108233923B - VCO, frequency calibration method thereof, electronic device, and computer storage medium - Google Patents
VCO, frequency calibration method thereof, electronic device, and computer storage medium Download PDFInfo
- Publication number
- CN108233923B CN108233923B CN201810018946.9A CN201810018946A CN108233923B CN 108233923 B CN108233923 B CN 108233923B CN 201810018946 A CN201810018946 A CN 201810018946A CN 108233923 B CN108233923 B CN 108233923B
- Authority
- CN
- China
- Prior art keywords
- varactor
- center frequency
- vco
- varactors
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000003247 decreasing effect Effects 0.000 claims abstract description 7
- 238000004590 computer program Methods 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 17
- 238000005259 measurement Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The embodiment of the invention discloses a VCO (voltage controlled oscillator) and a frequency calibration method thereof, electronic equipment and a computer storage medium, wherein the method comprises the following steps: measuring an actual center frequency of a first varactor, wherein the initial center frequency of the first varactor is a target operating frequency of the VCO; if the actual center frequency of the first varactor is deviated from the initial center frequency, measuring the actual center frequency of a second varactor, wherein the varactors in the VCO are sequentially arranged in parallel according to the sequence of gradually increasing or decreasing the initial center frequency, and the second varactors are a preset number of varactors arranged near the first varactor in the VCO; and selecting the second varactor corresponding to the target working frequency as a target varactor based on the actual center frequency of each second varactor, so as to realize the rapid calibration of the VCO.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a VCO (voltage controlled oscillator), a frequency calibration method thereof, electronic equipment and a computer storage medium.
Background
In radio technology, in order to improve the performance of electronic devices, feedback control circuits, such as Phase Locked Loops (PLLs), are widely provided in electronic devices. The PLL is a phase error control system, which compares the phases of a reference signal and an output signal to generate a phase error voltage to adjust the phase of the output signal, so as to achieve the purpose of the output signal having the same frequency as the reference signal. The core device in the PLL is a Voltage Controlled Oscillator (VCO), and the VCO is used to bring the oscillation frequency close to the frequency of the reference signal until the two frequencies are the same, so that the phase of the VCO output signal and the phase of the reference signal keep a certain specific relationship, thereby achieving the purpose of phase locking.
It follows that the VCO plays a critical role in the PLL, and the accuracy of the VCO directly affects the accuracy of the PLL. However, the center frequency of each varactor in the VCO varies with the operating environment (e.g., ambient temperature). Therefore, the VCO needs to be calibrated first before each use of the VCO. The current method of VCO frequency calibration is to re-measure each varactor in the VCO and determine the center frequency of each varactor at the current time.
However, the VCO includes many varactors, and it takes a lot of time to perform a new measurement for each varactor.
Disclosure of Invention
The embodiment of the invention provides a VCO (voltage controlled oscillator), a frequency calibration method thereof, electronic equipment and a computer storage medium, and aims to solve the problem of long time consumption of the conventional VCO frequency calibration method.
In a first aspect, an embodiment of the present invention provides a method for calibrating a frequency of a VCO, including:
measuring an actual center frequency of a first varactor, wherein the initial center frequency of the first varactor is a target operating frequency of the VCO;
if the actual center frequency of the first varactor is deviated from the initial center frequency, measuring the actual center frequency of a second varactor, wherein the varactors in the VCO are sequentially arranged in parallel according to the sequence of gradually increasing or decreasing the initial center frequency, and the second varactors are a preset number of varactors arranged near the first varactor in the VCO;
and selecting a target varactor corresponding to the target working frequency from the second varactors based on the actual center frequency of each of the second varactors.
In a second aspect, an embodiment of the present invention provides a VCO, including:
the plurality of variable capacitance tubes are sequentially connected in parallel according to the sequence that the initial center frequency gradually increases or decreases;
a memory for storing a computer program;
a processor for executing the computer program to implement the method for frequency calibration of a VCO according to the first aspect.
In a third aspect, an embodiment of the present invention provides an electronic device, including: the VCO of the second aspect.
In a fourth aspect, an embodiment of the present invention provides a computer storage medium, where a computer program is stored, and the computer program, when executed, implements the frequency calibration method for a VCO according to the first aspect.
The embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the actual center frequency of the first varactor is measured, wherein the initial center frequency of the first varactor is the target working frequency of the VCO; if the actual center frequency of the first varactor is deviated from the initial center frequency, measuring the actual center frequency of a second varactor, wherein the varactors in the VCO are sequentially arranged in parallel according to the sequence of gradually increasing or decreasing the initial center frequency, and the second varactors are a preset number of varactors arranged near the first varactor in the VCO; and selecting a target varactor corresponding to the target working frequency from the second varactors based on the actual center frequency of each varactor in the second varactors. That is, the method of this embodiment measures the second varactor near the first varactor, and determines the target varactor corresponding to the target operating frequency based on the measured actual center frequency of each varactor in the second varactor, so that the calibration process is simple, the number of times of measurement is greatly reduced, the calibration speed of the VCO is increased, and further, the operating efficiency of the PLL is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a PLL;
FIG. 2 is a diagram of a VCO in accordance with an embodiment of the present invention;
fig. 3 is a flowchart of a method for calibrating a frequency of a VCO according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a first position of a second varactor in a VCO in an embodiment of the present invention;
fig. 5 is a schematic diagram of a second position of the second varactor in the VCO according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a third position of the second varactor in the VCO according to the embodiment of the present invention;
fig. 7 is a diagram illustrating a fourth position of the second varactor in the VCO according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a fifth position of the second varactor in the VCO in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a VCO according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a PLL, and as shown in fig. 1, the PLL includes a phase detector, a loop filter, and a voltage controlled oscillator VCO. Wherein the phase detector is a phase comparison means for comparing the phase of the reference signal ui (t) with the output signal uo (t) of the VCO, the output voltage ud (t) of which is a function of the phase difference corresponding to ui (t) and uo (t). The loop filter filters out the high frequency components and noise in ud (t) to ensure the required performance of the loop. The VCO is controlled by the output voltage uc (t) of the loop filter to make the oscillation frequency close to the frequency of the reference information ui (t) until the two frequencies are the same, so that the phase of the VCO output signal and the phase of the reference signal keep a certain specific relationship, and the purpose of phase locking is achieved.
The PLL operates on the principle that the reference signal ui (t) is compared with the VCO output signal uo (t) in a phase detector, which outputs a voltage ud (t) proportional to the phase difference between the two (i.e., uo (t) and ui (t)), which is referred to as the error voltage. Next, the loop filter filters out the high frequency components in ud (t), and then inputs the filtered ud (t) into the VCO. The output signal frequency of the VCO varies with the variation of the reference signal. When the frequency of the output signal of the VCO is inconsistent with the frequency of the reference signal, the output of the phase detector generates a low-frequency change component, and the frequency of the output signal of the VCO is changed through the loop filter. The above process is cycled until the frequency of the output signal of the VCO is identical to the frequency of the reference signal ui (t), the frequency of the VCO stops changing, and the loop is in a locked state.
As shown in fig. 2, the VCO is composed of a plurality of varactors, each varactor corresponding to a frequency range, and the middle value of each frequency range is taken as the center frequency of the frequency range. However, the center frequency of each varactor in the VCO varies with the operating environment (e.g., ambient temperature). That is, when the environment changes, the actual center frequency of each varactor in the VCO is different from the initial center frequency at the factory, and if the PLL control is still performed according to the initial center frequency of the VCO, the PLL cannot normally operate. Therefore, the VCO needs to be calibrated first before each use of the VCO.
The prior art is to calibrate the VCO by re-measuring the center frequency of each varactor in the VCO. However, the VCO includes many varactors, and it takes a long time to perform a new measurement for each varactor.
In order to solve the above technical problem, an embodiment of the present invention provides a frequency calibration method for a VCO, which includes measuring an actual center frequency of a first varactor, measuring a second varactor near the first varactor if there is a deviation between the actual center frequency of the first varactor and an initial center frequency, and determining a target varactor corresponding to a target operating frequency based on the measured actual center frequency of the second varactor. That is, the method of this embodiment measures the actual center frequency of the second varactor near the first varactor, and the number of times of measurement is small, thereby greatly improving the calibration speed of the VCO and further improving the working efficiency of the PLL.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 3 is a flowchart of a method for calibrating a frequency of a VCO according to an embodiment of the present invention. As shown in fig. 3, the method of this embodiment may include:
and S101, measuring the actual center frequency of the first varactor, wherein the initial center frequency of the first varactor is the target working frequency of the VCO.
The implementation subject of this embodiment is a VCO (specifically, a processor in the VCO), and the VCO may be set alone or in an electronic device. The electronic device may be a television, a bluetooth device, a telemetry device or receiver, etc.
The method of this embodiment may be implemented before the PLL is controlled or when the PLL is in an open loop state.
As shown in fig. 2, the VCO includes a plurality of varactors, each of which is connected in series with a switch, by which the on and off of the varactor is controlled.
Each varactor corresponds to a frequency range, and the middle value of the frequency range is recorded as the center frequency of the varactor. For example, varactor a corresponds to a frequency range of [100GHz, 200GHz ], and then the center frequency of varactor a is 150 GHz.
When the VCO is shipped, the initial center frequency of each varactor in the VCO is measured, specifically, as shown in fig. 2, the switch K1 is closed to open other switches, a test voltage (e.g., a test voltage of 1.5V) is applied across the first varactor, and the initial frequency range of the first varactor is measured. The middle value of this initial frequency range is then taken as the initial center frequency of the first varactor. Referring to the above method, the initial frequency range of each varactor is measured in turn to obtain the initial center frequency corresponding to each varactor.
Each electronic device corresponds to a plurality of different operating frequencies, for example 40 operating frequencies for bluetooth devices. Therefore, the varactors corresponding to the preset working frequencies can be obtained from the initial center frequency corresponding to each varactor.
For example, taking a bluetooth device as an example, assuming that a VCO in the bluetooth device includes 128 varactors, each varactor corresponds to an initial center frequency, and then a one-to-one correspondence between the 128 varactors and the 128 initial center frequencies is obtained, forming table 1:
TABLE 1
| Varactor name | Initial center frequency (GHz) |
| Varactor 1 | 100 |
| Varactor 2 | 102 |
| …… | …… |
| Varactor 128 | 354 |
And then, acquiring the varactors corresponding to the preset working frequencies from the initial center frequency corresponding to each varactor.
Continuing with the above example, assuming that the bluetooth device corresponds to 40 operating frequencies, at this time, initial center frequencies that are one-to-one matched with the 40 operating frequencies can be searched from the 128 initial center frequencies shown in table 1, and the varactors corresponding to the initial center frequencies are denoted as varactors corresponding to the operating frequencies. Thus, a one-to-one correspondence between 40 operating frequencies and 40 varactors can be obtained, forming table 2:
TABLE 2
| Working frequency (GHz) | |
| 100 | |
| 120 | Varactor 11 |
| …… | …… |
| 140 | Varactor 21 |
As can be seen from the above description, table 2 is a part of table 1, where tables 1 and 2 may be set at the time of factory shipment and stored in the electronic device, and the calibration apparatus may obtain the initial center frequency corresponding to each varactor in the VCO and the varactor corresponding to each operating frequency from the electronic device.
In actual use, the electronic device operates at any one of the operating frequencies, for example, in actual use, the bluetooth device operates at any one of the 40 operating frequencies, and the operating frequency is recorded as the target operating frequency of the VCO. That is, the purpose of PLL control in an electronic device is to desirably lock the frequency of the electronic device to the target operating frequency so that the electronic device stably operates at the target operating frequency.
For example, since the target operating frequency of the VCO is 120GHz, as can be seen from table 1 or 2, varactor 11 corresponding to 120GHz is referred to as the first varactor 11 in the VCO.
Due to the change of the environment, the center frequency of the first varactor changes. For example, the environment where the bluetooth device is in during production is different from the environment where the bluetooth device is in at the present time, so that the initial center frequency of the first varactor in the bluetooth device is different from the actual center frequency of the first varactor at the present time, and it is necessary to measure the actual center frequency of the first varactor.
The actual center frequency of the first varactor is measured in the same manner as the initial center frequency of each varactor in the VCO. Specifically, a test voltage (e.g., a test voltage of 1.5V) is applied across the first varactor to obtain a frequency range of the first varactor, and a center frequency of the frequency range is defined as an actual center frequency of the first varactor.
This embodiment only measures the actual center frequency of first varactor promptly, calibrates the VCO based on this measuring result, compares and measures each varactor in prior art and compare, greatly reduced measured data volume, and then improved the calibration efficiency of VCO.
And S102, if the actual center frequency of the first varactor is deviated from the initial center frequency, measuring the actual center frequency of a second varactor, wherein the varactors in the VCO are sequentially arranged in parallel according to the sequence of gradual increase or decrease of the initial center frequency, and the second varactors are a preset number of varactors arranged near the first varactor in the VCO.
And S103, selecting the second varactor corresponding to the target working frequency as a target varactor based on the actual center frequency of each second varactor.
In particular, the actual center frequency of the first varactor is obtained according to the above steps, and the initial center frequency of the first varactor can be obtained from table 1. Then, the actual center frequency is compared with the initial center frequency to determine whether there is a deviation between the actual center frequency and the initial center frequency of the first varactor.
The actual center frequency of the varactor may vary around the initial center frequency of the varactor as the environment changes, and varactors in a VCO are arranged in parallel in order of increasing or decreasing initial center frequency. Thus, when there is a deviation between the actual center frequency of the first varactor and the initial center frequency, it can be determined that the target operating frequency is the same as the center frequency of one of the varactors in the vicinity of the first varactor.
In this way, a predetermined number of varactors arranged in the vicinity of the first varactor can be obtained as second varactors from the respective varactors of the VCO. For example, the first 10 varactors of the first varactor are obtained, and these 10 varactors are taken as the second varactor; or the last 10 varactors of the first varactor are obtained, and the 10 varactors are used as the second varactor; alternatively, the first 5 varactors and the last 5 varactors of the first varactor are obtained, and these 10 varactors are taken as the second varactor. The number of the obtained second varactors is not limited in this embodiment, and is specifically determined according to actual needs.
Then, the center frequency of each second varactor at the current moment is measured, and the actual center frequency of each second varactor is obtained.
The actual center frequency of each second varactor is measured in the same manner as the initial center frequency of each varactor in the VCO. Specifically, a test voltage (for example, a test voltage of 1.5V) is applied to both ends of each second varactor to obtain a frequency range of each second varactor, and a center frequency of each frequency range is used as an actual center frequency of the corresponding second varactor.
In this way a one-to-one correspondence between each second varactor and its corresponding actual center frequency can be obtained. Then, a second varactor corresponding to the target operating frequency is searched from the corresponding relation, and the second varactor is determined as a target varactor corresponding to the target operating frequency.
In one example, it is assumed that the initial center frequency and the target operating frequency of the first varactor are both 120 GHz. The first 3 varactors of the first varactor are obtained from the varactors of the VCO and are sequentially noted as a second varactor 1, a second varactor 2, and a second varactor 3. As can be seen from table 1, the first varactor corresponding to the initial center frequency of 120GHz is varactor 11, and therefore, the first 3 varactors of varactor 11 are varactor 10, varactor 9, and varactor 8, respectively. That is, the second varactor 1 is varactor 10, the second varactor 2 is varactor 9, and the second varactor 3 is varactor 8.
Then, the second varactor 1, the second varactor 2, and the second varactor 3 are measured, and the actual center frequencies at the current time are obtained as: 122GHz, 120GHz and 118 GHz. At this time, from the actual center frequency of each second varactor, it is determined that the varactor corresponding to the target operating frequency of 120GHz is the second varactor 2, and the second varactor 2 is the varactor 9 in table 1, so that the varactor 9 is the target varactor corresponding to the target operating frequency at the current time. That is, the target varactor corresponding to the target operating frequency 120GHz is changed from the previous varactor 11 to the varactor 9 after calibration in this embodiment, and accurate calibration of the VCO is achieved.
That is, the present embodiment only measures the center frequencies of a certain number of second varactors, and determines a target varactor corresponding to a target operating frequency based on the measurement result, thereby implementing calibration of the VCO. Compared with the prior art that each varactor is measured, the method greatly reduces the measured data volume and further improves the calibration efficiency of the VCO.
In a possible implementation manner of this embodiment, in step S103, the target operating frequency may be compared with the actual center frequency of each second varactor one by one, so as to determine the second varactor corresponding to the target operating frequency, and the second varactor is used as the target varactor.
In another possible implementation manner of this embodiment, in step S103, specifically, a second varactor corresponding to the target operating frequency is determined from actual center frequencies of the second varactors based on a dichotomy, and the second varactor is used as the target varactor.
For example, the actual center frequencies of the second varactors are sorted from small to large (or arranged from large to small), the median of the largest actual center frequency and the smallest actual center frequency is obtained, and the median is compared with the target operating frequency. When the target operating frequency is between the intermediate value and the maximum actual center frequency, the intermediate value of the intermediate value and the maximum actual center frequency is obtained, and the new intermediate value is compared with the target operating frequency. This gradually narrows the interval until the intermediate value is equal to the target operating frequency. The method can quickly obtain the target varactor corresponding to the target working frequency, and further improve the calibration speed of the VCO.
According to the frequency calibration method of the VCO, the actual center frequency of the first varactor is measured, wherein the initial center frequency of the first varactor is the target working frequency of the VCO; if the actual center frequency of the first varactor is deviated from the initial center frequency, measuring the actual center frequency of a second varactor, wherein the varactors in the VCO are sequentially arranged in parallel according to the sequence of gradually increasing or decreasing the initial center frequency, and the second varactors are a preset number of varactors arranged near the first varactor in the VCO; and selecting the second varactor corresponding to the target working frequency as the target varactor based on the actual center frequency of each second varactor. That is, the method of this embodiment measures the second varactor near the first varactor, and determines the target varactor corresponding to the target operating frequency based on the measured actual center frequency of the second varactor, so that the calibration process is simple, the number of times of measurement is greatly reduced, the calibration speed of the VCO is increased, and the operating efficiency of the PLL is further increased.
In this embodiment, the difference of the initial center frequencies between two adjacent varactors in the VCO is the same, and the predetermined number is the ratio of the deviation to the difference.
Specifically, as shown in fig. 2, the difference between the initial center frequencies of two adjacent varactors in the VCO is the same, where the preset number (denoted as M) of the second varactors is the ratio of the deviation (i.e., the difference between the actual center frequency of the first varactor and the initial center frequency) to the difference (i.e., the difference between the initial center frequencies of two adjacent varactors in the VCO). For example, as shown in table 1, the difference between the initial center frequencies of two adjacent varactors in the VCO is 2GHz, and if the deviation between the actual center frequency of the first varactor and the initial center frequency is 10GHz, the preset number M is 10GHz/2GHz =5, and at this time, if the varactors in the VCO sequentially increase the parallel devices from small to large according to the initial center frequency, the first 5 varactors of the first varactor can be selected as the second varactors.
It should be noted that M is a positive integer, and when the ratio of the deviation between the actual center frequency of the first varactor and the initial center frequency and the difference between the initial center frequencies of two adjacent varactors in the VCO is a decimal number, the integer number of the decimal number is added with 1 to obtain the value of M, for example, when the above ratio is 2.3, M is taken to be 3.
Optionally, the preset number M may be greater than a ratio of the deviation to a difference between initial center frequencies of two adjacent varactors in the VCO. For example, if the ratio of the deviation to the difference between the initial center frequencies of two adjacent varactors in the VCO is 5, then M may be a positive integer greater than 5.
In a possible implementation of this embodiment, if the deviation is greater than 0, the initial center frequency of each of the second varactors is smaller than the initial center frequency of the first varactor.
The above steps may include the following two cases according to different setting modes of varactors in the VCO:
in the first case, it is assumed that the varactors in the VCO of this embodiment are sequentially arranged in parallel from small to large according to the initial center frequency, and at this time, if the deviation (i.e., the difference) between the actual center frequency of the first varactor and the initial center frequency is greater than 0, the initial center frequency of each second varactor of this embodiment is smaller than the initial center frequency of the first varactor.
Specifically, fig. 4 is a schematic diagram of a first position of a second varactor in a VCO according to an embodiment of the present invention, and as shown in fig. 4, the varactors in the VCO are sequentially arranged in parallel from small to large according to an initial center frequency, and when it is determined that an actual center frequency of a first varactor is greater than the initial center frequency, that is, a deviation between the actual center frequency of the first varactor and the initial center frequency is greater than 0, it is described that a center frequency of each varactor in the VCO at the current time is increased from the respective initial center frequency. At this time, the target operating frequency falls on the center frequencies of the first M varactors of the first varactor, and therefore, the first M varactors of the first varactor (i.e., the varactors in the dashed box of fig. 4) are obtained and are referred to as second varactors, and the initial center frequencies of these second varactors are all lower than the initial center frequency of the first varactor.
For example, referring to table 1, assuming that the initial center frequency and the target operating frequency of the first varactor are both 120GHz, and the actual center frequency of the first varactor at the current time is 124GHz, at this time, the deviation between the actual center frequency of the first varactor and the initial center frequency thereof is 4GHz > 0. Because each varactor in the VCO increases progressively the parallel arrangement from small to large according to initial center frequency in proper order, can confirm that target operating frequency 120GHz can fall on the center frequency of a certain varactor in the preceding M varactors of first varactor this moment, and then obtain the preceding M varactors of first varactor in each varactor of follow VCO, mark this preceding M varactors as the second varactor, the initial center frequency of these second varactors all is less than the initial center frequency of first varactor.
In the second case, it is assumed that the varactors in the VCO of this embodiment are sequentially arranged in parallel from the initial center frequency to the initial center frequency, and at this time, if the deviation (i.e., the difference) between the actual center frequency of the first varactor and the initial center frequency is greater than 0, the initial center frequency of each second varactor of this embodiment is smaller than the initial center frequency of the first varactor.
Specifically, fig. 5 is a schematic diagram of a second position of the second varactor in the VCO according to the embodiment of the present invention, as shown in fig. 5, the varactors in the VCO are sequentially arranged in parallel in a descending order according to the initial center frequency, and when it is determined that the actual center frequency of the first varactor is greater than the initial center frequency, that is, the deviation between the actual center frequency of the first varactor and the initial center frequency is greater than 0, it is described that the center frequency of each varactor in the VCO at the current time is increased from the respective initial center frequency. At this time, the target operating frequency falls on the center frequencies of the last M varactors of the first varactor, and therefore, the last M varactors of the first varactor (i.e., each varactor in the dashed box of fig. 5) are obtained, and these last M varactors are referred to as second varactors, and the initial center frequencies of these second varactors are all smaller than the initial center frequency of the first varactor.
For example, assuming that the initial center frequency and the target operating frequency of the first varactor are both 120GHz, and the actual center frequency of the first varactor at the present time is 124GHz, at this time, the deviation of the actual center frequency of the first varactor from the initial center frequency thereof is 4GHz > 0. Because each varactor in the VCO is arranged in parallel in a descending order from large to small according to the initial center frequency, the target working frequency of 120GHz can be determined to fall on the center frequency of one varactor in the last M varactors of the first varactor, and then the last M varactors of the first varactor are obtained from each varactor of the VCO, the last M varactors are marked as second varactors, and the initial center frequencies of the second varactors are all smaller than the initial center frequency of the first varactor.
In another possible implementation of this embodiment, if the deviation is smaller than 0, the initial center frequency of each of the second varactors is larger than the initial center frequency of the first varactor.
The above steps may include the following two cases according to different setting modes of varactors in the VCO:
in the first case, it is assumed that the varactors in the VCO of this embodiment are sequentially arranged in parallel from small to large according to the initial center frequency, and at this time, if the deviation (i.e., the difference) between the actual center frequency of the first varactor and the initial center frequency is smaller than 0, the initial center frequency of each second varactor of this embodiment is greater than the initial center frequency of the first varactor.
Specifically, fig. 6 is a schematic diagram of a third position of the second varactor in the VCO according to the embodiment of the present invention, as shown in fig. 6, the varactors in the VCO are sequentially arranged in parallel from small to large according to the initial center frequency, and when it is determined that the actual center frequency of the first varactor is smaller than the initial center frequency, that is, the deviation between the actual center frequency of the first varactor and the initial center frequency is smaller than 0, it is described that the center frequency of each varactor in the VCO at the current time is smaller than the respective initial center frequency. At this time, the target operating frequency may fall on the center frequency of the last M varactors of the first varactor. Thus, the last M varactors of the first varactor (i.e., each varactor in the dashed box of fig. 6) are obtained, and these last M varactors are denoted as second varactors, and the initial center frequencies of these second varactors are all greater than the initial center frequency of the first varactor.
For example, referring to table 1, assuming that the initial center frequency and the target operating frequency of the first varactor are both 120GHz, the actual center frequency of the first varactor at the present time is 118GHz, and at this time, the deviation between the actual center frequency of the first varactor and the initial center frequency thereof is-2 GHz < 0. Because each varactor in the VCO increases progressively the parallel arrangement from small to large according to initial center frequency in proper order, can confirm that target operating frequency 120GHz can fall on the center frequency of a certain varactor in the last M varactors of first varactor this moment, and then obtain the last M varactors of first varactor in each varactor of follow VCO, mark this back M varactors as the second varactor, the initial center frequency of these second varactors all is greater than the initial center frequency of first varactor.
In the second case, it is assumed that the varactors in the VCO of this embodiment are sequentially arranged in parallel from the initial center frequency to the initial center frequency, and at this time, if the deviation (i.e., the difference) between the actual center frequency of the first varactor and the initial center frequency is smaller than 0, the initial center frequency of each second varactor of this embodiment is greater than the initial center frequency of the first varactor.
Specifically, fig. 7 is a fourth position schematic diagram of the second varactor in the VCO according to the embodiment of the present invention, and as shown in fig. 7, the varactors in the VCO are sequentially arranged in parallel in a descending order according to the initial center frequency, and when it is determined that the actual center frequency of the first varactor is smaller than the initial center frequency, that is, the deviation between the actual center frequency of the first varactor and the initial center frequency is smaller than 0, it is indicated that the center frequency of each varactor in the VCO at the current time is smaller than the respective initial center frequency. At this time, the target operating frequency falls on the center frequencies of the first M varactors of the first varactor, and therefore, the first M varactors of the first varactor (i.e., the varactors in the dashed box of fig. 7) are obtained and are referred to as second varactors, and the initial center frequencies of these second varactors are all greater than the initial center frequency of the first varactor.
For example, assuming that the initial center frequency and the target operating frequency of the first varactor are both 120GHz, and the actual center frequency of the first varactor at the present time is 118GHz, the deviation between the actual center frequency of the first varactor and the initial center frequency thereof is-2 GHz < 0. Because each varactor in the VCO is arranged in parallel in a descending order from large to small according to the initial center frequency, it can be determined that the target working frequency 120GHz can fall on the center frequency of one varactor in the first M varactors of the first varactor, then the first M varactors of the first varactor are obtained from each varactor of the VCO, the first M varactors are marked as second varactors, and the initial center frequencies of the second varactors are all greater than the initial center frequency of the first varactor.
It should be noted that, in this embodiment, if there is no deviation between the actual center frequency of the first varactor and the initial center frequency, that is, when the actual center frequency of the first varactor is equal to the initial center frequency, it is stated that the center frequency of the first varactor is not changed, the first varactor may be selected as the target varactor.
According to the VCO frequency calibration method provided by the embodiment of the present invention, if the deviation is greater than 0, it is determined that the initial center frequency of each second varactor is smaller than the initial center frequency of the first varactor, and if the deviation is smaller than 0, it is determined that the initial center frequency of each second varactor is greater than the initial center frequency of the first varactor, thereby accurately determining the second varactor.
In yet another possible implementation manner of this embodiment, the difference of the initial center frequencies between two adjacent varactors in the VCO of this embodiment is the same, and the predetermined number is twice the ratio of the deviation to the difference, that is, the predetermined number of this embodiment is 2M.
At this time, the first M varactors and the last M varactors of the first varactor in the VCO may be used as the second varactor.
Because each varactor in the VCO sequentially increases progressively from small to large according to the initial center frequency and is arranged in parallel or sequentially decreases progressively from large to small and is arranged in parallel, when the actual center frequency of the first varactor is deviated from the initial center frequency, the target working frequency can be determined to fall on the center frequency corresponding to a certain varactor nearby the first varactor, and at the moment, a plurality of varactors nearby the first varactor can be used as the second varactor.
Specifically, fig. 8 is a schematic diagram of a fifth position of the second varactor in the VCO according to the embodiment of the present invention, and as shown in fig. 8, with the first varactor as a center, M varactors (i.e., varactors in a dashed box in fig. 8) are respectively taken from two sides of the first varactor, that is, the first M varactors of the first varactor are obtained from the VCO as the second varactors, and the last M varactors of the first varactor are obtained as the second varactors at the same time, so that 2M second varactors are obtained.
Compared with the above embodiments, the method of this embodiment does not determine the sequential arrangement of the varactors in the VCO and the deviation of the actual center frequency of the first varactor from the initial center frequency, and directly takes M varactors from both sides of the first varactor as the second varactors, so that the whole process is simpler.
Fig. 9 is a schematic structural diagram of a VCO according to an embodiment of the present invention, and as shown in fig. 9, a VCO100 according to this embodiment includes: the VCO frequency calibration method comprises a plurality of varactors 10, a memory 11 and a processor 12, wherein the varactors 10 are sequentially and parallelly arranged according to an order of gradually increasing or decreasing an initial center frequency, the memory 11 is used for storing a computer program, and the processor 12 is used for executing the computer program and executing the technical scheme of the VCO frequency calibration method.
Fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 10, the electronic device 200 according to the embodiment includes: such as the VCO100 shown in fig. 9.
When at least a part of the functions of the frequency calibration method for the VCO in the embodiment of the present invention are implemented by software, the embodiment of the present invention further provides a computer storage medium, which is used to store the computer software instructions for performing the frequency calibration for the VCO described above, and when the computer storage medium is run on a computer, the computer storage medium enables the computer to perform various possible frequency calibration methods for the VCO in the above method embodiments. The processes or functions described in accordance with the embodiments of the present invention may be generated in whole or in part when the computer-executable instructions are loaded and executed on a computer. The computer instructions may be stored on a computer storage medium or transmitted from one computer storage medium to another via wireless (e.g., cellular, infrared, short-range wireless, microwave, etc.) to another website site, computer, server, or data center. The computer storage media may be any available media that can be accessed by a computer or a data storage device, such as a server, data center, etc., that incorporates one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., SSD), among others.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A method of frequency calibration of a VCO, comprising:
measuring an actual center frequency of a first varactor, wherein the initial center frequency of the first varactor is a target operating frequency of the VCO;
if the actual center frequency of the first varactor is deviated from the initial center frequency, measuring the actual center frequency of a second varactor, wherein the varactors in the VCO are sequentially arranged in parallel according to the sequence of gradually increasing or decreasing the initial center frequency, and the second varactors are a preset number of varactors arranged near the first varactor in the VCO;
selecting a target varactor corresponding to the target working frequency from the second varactors based on the actual center frequency of each of the second varactors;
the difference of the initial center frequencies between two adjacent varactors in the VCO is the same, and the preset number is a ratio of the deviation to the difference.
2. The method of claim 1, wherein an initial center frequency of each of the second varactors is less than an initial center frequency of the first varactor if the deviation is greater than 0.
3. The method of claim 1, wherein an initial center frequency of each of the second varactors is greater than an initial center frequency of the first varactor if the deviation is less than 0.
4. The method of claim 1, further comprising: and if no deviation exists between the actual center frequency and the initial center frequency of the first varactor, selecting the first varactor as a target varactor.
5. A VCO, comprising:
the plurality of variable capacitance tubes are sequentially connected in parallel according to the sequence that the initial center frequency gradually increases or decreases;
a memory for storing a computer program;
a processor for executing the computer program to implement the method of frequency calibration of a VCO according to any of claims 1 to 4.
6. An electronic device comprising the VCO of claim 5.
7. A computer storage medium, characterized in that the storage medium has stored therein a computer program which, when executed, implements a method of frequency calibration of a VCO according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810018946.9A CN108233923B (en) | 2018-01-09 | 2018-01-09 | VCO, frequency calibration method thereof, electronic device, and computer storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810018946.9A CN108233923B (en) | 2018-01-09 | 2018-01-09 | VCO, frequency calibration method thereof, electronic device, and computer storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108233923A CN108233923A (en) | 2018-06-29 |
| CN108233923B true CN108233923B (en) | 2021-09-14 |
Family
ID=62640403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810018946.9A Active CN108233923B (en) | 2018-01-09 | 2018-01-09 | VCO, frequency calibration method thereof, electronic device, and computer storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108233923B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399542A (en) * | 2008-09-16 | 2009-04-01 | 上海芯略电子科技有限公司 | Phase lock loop having temperature drift compensation and method thereof |
| CN102017422A (en) * | 2008-05-07 | 2011-04-13 | 高通股份有限公司 | VCO capacitor bank trimming and calibration |
| JP2012199761A (en) * | 2011-03-22 | 2012-10-18 | Nec Corp | Phase-locked loop and method of controlling the same |
| CN103036560A (en) * | 2012-12-13 | 2013-04-10 | 广州润芯信息技术有限公司 | Phase-locked loop and circuit and method of closed loop frequency self-calibration of phase-locked loop |
| CN103095295A (en) * | 2012-12-28 | 2013-05-08 | 重庆西南集成电路设计有限责任公司 | Phase-locking frequency synthesizer, self-adaptation frequency calibration circuit and calibration method |
| CN103404032A (en) * | 2011-03-03 | 2013-11-20 | 高通股份有限公司 | Temperature compensation and coarse tune bank switches in a low phase noise VCO |
| CN104242924A (en) * | 2013-07-26 | 2014-12-24 | 西安电子科技大学 | Multi-band inductance-capacitance voltage-controlled oscillator with automatic frequency calibrating function |
| CN104579330A (en) * | 2015-01-20 | 2015-04-29 | 北京华强智连微电子有限责任公司 | Two-step automatic frequency calibration circuit and method of phase-locked loop |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7038552B2 (en) * | 2003-10-07 | 2006-05-02 | Analog Devices, Inc. | Voltage controlled oscillator having improved phase noise |
| US20160099678A1 (en) * | 2014-10-06 | 2016-04-07 | Qualcomm Incorporated | Vco, pll, and varactor calibration |
-
2018
- 2018-01-09 CN CN201810018946.9A patent/CN108233923B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102017422A (en) * | 2008-05-07 | 2011-04-13 | 高通股份有限公司 | VCO capacitor bank trimming and calibration |
| CN101399542A (en) * | 2008-09-16 | 2009-04-01 | 上海芯略电子科技有限公司 | Phase lock loop having temperature drift compensation and method thereof |
| CN103404032A (en) * | 2011-03-03 | 2013-11-20 | 高通股份有限公司 | Temperature compensation and coarse tune bank switches in a low phase noise VCO |
| JP2012199761A (en) * | 2011-03-22 | 2012-10-18 | Nec Corp | Phase-locked loop and method of controlling the same |
| CN103036560A (en) * | 2012-12-13 | 2013-04-10 | 广州润芯信息技术有限公司 | Phase-locked loop and circuit and method of closed loop frequency self-calibration of phase-locked loop |
| CN103095295A (en) * | 2012-12-28 | 2013-05-08 | 重庆西南集成电路设计有限责任公司 | Phase-locking frequency synthesizer, self-adaptation frequency calibration circuit and calibration method |
| CN104242924A (en) * | 2013-07-26 | 2014-12-24 | 西安电子科技大学 | Multi-band inductance-capacitance voltage-controlled oscillator with automatic frequency calibrating function |
| CN104579330A (en) * | 2015-01-20 | 2015-04-29 | 北京华强智连微电子有限责任公司 | Two-step automatic frequency calibration circuit and method of phase-locked loop |
Non-Patent Citations (3)
| Title |
|---|
| A 0.5 V LC-VCO with improved varactor tuning technique;Zhiqun Li;《Analog Integr Circ Sig Process》;20131227;参见正文第835-840页以及图3、图7 * |
| U波段小数分频锁相环型频率综合器;阴亚东;《固体电子学研究与进展》;20100930;全文 * |
| 自调谐V C O 频段选择技术比较与设计;黄水龙;《设计与开关》;20051031;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108233923A (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9455854B2 (en) | Phase-locked loop frequency calibration method and system | |
| US9413369B2 (en) | Digital phase-locked loop (DPLL), method of controlling DPLL, and ultra low power (ULP) transceiver using DPLL | |
| US9337850B2 (en) | All-digital phase-locked loop (ADPLL) with reduced settling time | |
| CN101091316B (en) | Method and device for Vco center frequency tuning and limiting gain variation | |
| US8704603B2 (en) | Low power wideband LO using tuned injection locked oscillator | |
| CN106656173B (en) | Frequency calibration circuit of oscillator and frequency calibration method thereof | |
| US8019564B2 (en) | Systems and methods for calibrating the loop bandwidth of a phase-locked loop (PLL) | |
| US7382199B2 (en) | Methods for auto-calibration and fast tuning of voltage controlled oscillators in phase-lock loops | |
| JP5573484B2 (en) | Phase synchronization circuit and wireless communication device | |
| US10425039B2 (en) | Apparatus and method for calibrating frequency of oscillator in response to external signal | |
| US7609122B2 (en) | Method and system for calibration of a tank circuit in a phase lock loop | |
| US11356058B1 (en) | Oscillator with frequency variation compensation | |
| KR102375949B1 (en) | Apparatus and method for controlling output of frequency synthesizer | |
| CN107820681A (en) | Fast coarse and fine tuning calibration of multi-curve calibrated synthesizer within target window | |
| KR20060030056A (en) | Loop-Filter Calibration for Phase-Locked Loops | |
| TW201914215A (en) | Method of controlling digitally controlled oscillator | |
| CN108023589A (en) | A kind of transmitting frequency calibration method and circuit | |
| CN108233923B (en) | VCO, frequency calibration method thereof, electronic device, and computer storage medium | |
| CN108259036B (en) | VCO, frequency calibration method thereof, electronic device, and computer storage medium | |
| CN111884649B (en) | Circuit calibration method, device, circuit, equipment and storage medium | |
| US9784770B2 (en) | Devices and methods of measuring gain of a voltage-controlled oscillator | |
| US7312664B2 (en) | Methods and apparatuses for testing a voltage-controlled oscillator (VCO) to verify operation across supply voltage and/or temperature | |
| Pilipenko | Testing of Numerical Simulation Methods for Hybrid Frequency Synthesizers | |
| US12052022B2 (en) | Coarse-mover with sequential finer tuning step | |
| JP2011166473A (en) | Semiconductor integrated circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |