KR20240178622A - Frequency synthesis module and automatic tuning system for 5g specialized network - Google Patents

Abstract

The present invention provides a frequency synthesis module and automatic tuning system for a 5G specialized network, characterized in that it includes a low-pass filter unit for low-passing a reference signal, a phase loop unit for detecting a difference between an input signal passing through the low-pass filter unit and an output signal of a divided voltage-controlled oscillator unit to control a voltage-controlled oscillator unit, an operational amplifier unit for amplifying the output signal of the phase loop unit and providing the amplified signal to the voltage-controlled oscillator unit, a voltage-controlled oscillator unit for changing the output frequency according to the provided signal, a division unit for dividing the output frequency of the voltage-controlled oscillator unit and providing the divided signal to the phase loop unit, and a high-pass filter unit for high-passing the output of the voltage-controlled oscillator unit.

Description

{FREQUENCY SYNTHESIS MODULE AND AUTOMATIC TUNING SYSTEM FOR 5G SPECIALIZED NETWORK}

The present invention relates to a frequency synthesis module and an automatic tuning system corresponding to a 5G specialized network, and provides a frequency synthesis module and an automatic tuning system that can be used in a 5G unlicensed frequency and specialized network.

The Frequency Synthesizer Module (FSM) generates various output frequencies based on a single reference frequency, and its main function is to generate signals for upward and downward changes in RF signals.

The existing frequency synthesis module has a problem in the production system that follows manual tuning because it uses a method in which a skilled engineer adjusts the main factors and records/manages the phase noise of each stage. In other words, since it takes more than 8 hours of tuning (calibration) time per frequency synthesis module based on a skilled engineer, there is a disadvantage in low productivity due to increased production period, unit cost, and defense cost share.

In addition, existing frequency synthesis modules have difficulty responding to 5G frequencies as they are products with a bandwidth of 1 to 900 MHz.

(Patent Document 1) Korean Patent Publication No. 10-2002-0056374 (Patent Document 2) Korean Patent Publication No. 10-1036059

The present invention has been made to solve the above-described problems, and relates to a system and method for preventing electric shock accidents in high-voltage lines, which supports a wideband bandwidth, enables a simplified and miniaturized system design, increases product productivity with high-quality phase noise, reduces production costs, secures product competitiveness, and enables localization, operates in a wideband of 10 to 20 GHz or more, and can be immediately applied in various markets using 5G.

The present invention relates to a frequency synthesis module for a 5G specialized network, comprising: a low-pass filter unit for low-passing a reference signal; a phase loop unit for detecting a difference between an input signal passing through the low-pass filter unit and an output signal of a divided voltage-controlled oscillator unit to control a voltage-controlled oscillator unit; an operational amplifier unit for amplifying the output signal of the phase loop unit and providing the amplified signal to the voltage-controlled oscillator unit; a voltage-controlled oscillator unit for changing an output frequency according to the provided signal; a division unit for dividing the output frequency of the voltage-controlled oscillator unit and providing the divided signal to the phase loop; and a high-pass filter unit for high-passing the output of the voltage-controlled oscillator unit.

The above phase loop section is characterized by including a first counter section that counts a reference input signal that has passed through a low-pass filter section, a phase frequency detection section that detects a phase difference between an output signal of the first counter section and an output signal of a voltage-controlled oscillator section, a charge pump section that generates an output voltage based on the output of the phase frequency detection section, and a second counter section that adjusts the frequency of the voltage-controlled oscillator section that has passed through a division section and provides it to the phase frequency detection section.

The above division unit includes a first division unit that reduces the relative phase difference between the output of the phase loop unit and the input of the voltage controlled oscillator, and a second division unit that adjusts the output frequency of the phase loop unit by frequency-dividing the output frequency of the voltage controlled oscillator, and the first division unit divides the output frequency of the voltage controlled oscillator and provides the same to the second division unit, and the second division unit has a constant division ratio, divides the output of the first division unit, and then sends the divided frequency to the phase loop unit through a feedback path to generate an error signal.

In addition, the present invention provides a frequency synthesis module corresponding to a 5G specialized network, characterized by including an input filter unit for removing noise of an input signal, a phase loop unit for controlling a voltage controlled oscillator unit by detecting a difference between a signal provided from the input filter unit and an output signal of a voltage controlled oscillator unit fed back through a low pass selector unit, an operational amplifier unit for amplifying the output signal of the phase loop unit and providing it to the voltage controlled oscillator unit, a voltage controlled oscillator unit for changing an output frequency according to the signal provided from the operational amplifier unit, a band output unit for selecting and outputting a frequency band, an amplifier unit for receiving feedback and amplifying the output of the band output unit, a division unit for dividing the output of the amplifier unit and outputting it, and a low pass selector unit for providing the output of the division unit to the phase loop unit.

The above phase loop section is characterized by including a phase frequency detection section that detects a phase difference between an output signal of an input filter section and an output signal of a voltage-controlled oscillator section, a charge pump section that generates an output voltage based on the output of the phase frequency detection section, and a counter section that adjusts the frequency of the voltage-controlled oscillator section that has passed through a low-pass selection section and provides it to the phase frequency detection section.

The above band output unit is characterized by including a first SPDT switch located at an input terminal, a second SPDT switch located at an output terminal, a first band pass filter and a second band pass filter connected in parallel between the two switches, and a coupler for transmitting the output of the second SPDT switch to the outside.

The above first and second SPDT switches selectively allow the output signal of the voltage-controlled oscillator to pass through a band-pass filter to control the frequency transmitted to the output terminal, wherein the first band-pass filter uses a filter that passes a lower bandwidth among the pass bandwidths, and the second band-pass filter uses a filter that passes an upper bandwidth, and the signal of the coupler is transmitted to the outside through the output terminal or transmitted to the phase loop unit through an amplifier unit, a divider unit, and a low-pass selector unit.

The above low-pass selection unit includes a third SPDT switch located at an input terminal, a fourth SPDT switch located at an output terminal, and a first low-pass filter and a second low-pass filter connected in parallel between the two switches, wherein the third and fourth SPDT switches selectively allow an output signal passing through an amplifier and a divider to pass through the low-pass filter to adjust the frequency transmitted to the phase loop unit, and the first low-pass filter allows a frequency band having low frequency characteristics and blocks a high frequency band, and the second low-pass filter allows a frequency band having high frequency characteristics and blocks a low frequency band.

In addition, the present invention provides an automatic tuning system characterized by including a frequency synthesis module that detects a phase difference between the frequencies of a reference signal and an output signal, receives feedback to adjust an output signal so that the phase difference is reduced within a range of a set reference level, an automatic tuning unit that controls the frequency synthesis module in an open loop state to correct the frequency, and a control unit that determines a correction level corresponding to the phase difference between the frequency of a divided output signal and the frequency of a reference signal.

In this way, the present invention can support wideband bandwidth and enable a simplified and miniaturized system design.

In addition, it is possible to increase product productivity, reduce production costs, secure product competitiveness, and achieve localization of products with high-quality phase noise.

Additionally, it can operate in a wideband from 10 to 20 GHz or more, and can be immediately applied in various markets using 5G.

FIG. 1 is a drawing for explaining a 5G specialized network responsive frequency synthesis module according to one embodiment of the present invention.
FIG. 2 is a drawing for explaining a phase loop section according to one embodiment.
FIG. 3 is a drawing for explaining a 5G specialized network responsive frequency synthesis module according to another embodiment of the present invention.
FIG. 4 is a drawing for explaining a phase loop section according to another embodiment.
Fig. 5 is a drawing for explaining a band output unit according to another embodiment.
FIG. 6 is a drawing for explaining a low pass selector according to another embodiment.
FIG. 7 is a drawing for explaining an automatic tuning system according to one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and these embodiments are provided only to make the disclosure of the present invention complete and to fully inform a person having ordinary skill in the art of the scope of the invention. In the drawings, the same reference numerals refer to the same elements.

It is to be clarified that the division of components in this specification is only a division by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be divided into two or more by more detailed functions. In addition, each component to be described below may additionally perform some or all of the functions of other components in addition to its own main function, and it goes without saying that some of the main functions of each component may be exclusively performed by other components. Therefore, the existence of each component described in this specification should be interpreted functionally. For this reason, it is to be clarified that the configuration of the components of the 5G specialized network-compatible frequency synthesis module and automatic tuning system of the present invention may be different within the scope that the purpose of the present invention can be achieved.

In this specification, relational terms such as first and second, upper and lower, etc. may be used only to distinguish one entity or action from another without necessarily requiring or implying an actual relationship or order between such entities or actions. The terms "comprises," "comprising," or other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of components does not include only the components, but may include other components not expressly listed or inherent in such process, method, article, or apparatus. A component that proceeds as "comprises a ~" excludes, without further limitation, the presence of additional identical components in the process, method, article, or apparatus that includes the component.

FIG. 1 is a drawing for explaining a 5G specialized network responsive frequency synthesis module according to one embodiment of the present invention.

FIG. 2 is a drawing for explaining a phase loop section according to one embodiment.

As illustrated in FIGS. 1 and 2, the 5G-specific network-compatible frequency synthesis module according to the present embodiment includes a low-pass filter unit (100) for low-passing a reference signal, a phase loop unit (200) for detecting a difference between an input signal passing through the low-pass filter unit (100) and an output signal of a divided voltage-controlled oscillator unit (400) to control the voltage-controlled oscillator unit (400), an operational amplifier unit (300) for amplifying the output signal of the phase loop unit (200) and providing it to the voltage-controlled oscillator unit (400), a voltage-controlled oscillator unit (400) for changing the output frequency according to the provided signal, a division unit (500) for dividing the output frequency of the voltage-controlled oscillator unit (400) and providing it to the phase loop unit (200), and a high-pass filter unit (600) for high-passing the output of the voltage-controlled oscillator unit (400).

The low pass filter unit (100) removes high frequency noise and provides a stable voltage to the phase loop unit (200). At this time, it is effective that the voltage provided is a DC voltage. The low pass filter unit (100) is configured with an RC circuit, and a low frequency signal for an input signal is output through the RC circuit, and high frequency signals are not allowed to pass. Through this, a part of the frequency spectrum of the input signal can be removed, and the remaining low frequency components can be accurately filtered and output. Through this, the low pass filter unit (100) removes high frequency components of the output signal of the voltage control oscillator unit (400) and provides a stable DC voltage to the control circuit of the phase loop unit (200), thereby maintaining the circuit stability of the phase loop unit (200).

The phase loop unit (200) includes a first counter unit (210) that counts a reference input signal that has passed through a low pass filter unit (100), a phase frequency detection unit (220) that detects a phase difference between an output signal of the first counter unit (210) and an output signal of a voltage control oscillator unit (400), a charge pump unit (230) that generates an output voltage based on the output of the phase frequency detection unit (220), and a second counter unit (240) that adjusts the frequency of the voltage control oscillator unit (400) that has passed through a frequency divider unit (500) and provides it to the phase frequency detection unit (220).

The first counter unit (210) matches the reference input clock frequency to the output frequency of the voltage control oscillator unit (400). The first counter unit (210) changes the count value to control the output. The first counter (210) is composed of a D flip-flop and can start counting from the end of the previous cycle. Of course, the counter can be initialized according to a reset signal.

The phase frequency detection unit (220) receives the output of the low pass filter unit (100) and the output of the counter unit (240) and detects the frequency and phase difference between these two signals. Through this, the frequency of the voltage control oscillator unit (400) can be adjusted and signal synchronization becomes possible.

The charge pump unit (230) amplifies the output signal of the phase frequency detection unit (220) and controls the control voltage of the voltage control oscillator unit (400). Such a charge pump (230) is configured using a MOSFET, and changes the output by controlling different MOSFETs when the output of the phase frequency detection unit (220) increases and decreases, and at this time, the amount of change is proportional to the amount of change in the output of the phase frequency detection unit (220).

The second counter (240) counts the input clock signal, that is, divides a specific frequency. In addition, it maintains a constant ratio between the output frequency of the voltage control oscillator (400) and the output frequency of the phase loop unit (200). The second counter (240) is a digital counter that uses a counting value to adjust the output frequency. In order to increase the frequency, the counting value decreases, and in order to decrease the frequency, the counting value increases.

The operational amplifier (300) amplifies the output of the phase loop unit (200) and stabilizes the overall circuit operation to adjust the voltage level of the output signal. Through this, the output signal frequency of the voltage control oscillator unit (400) can be adjusted.

The operational amplifier (300) of the present embodiment can be used as a loop filter. That is, it can enable fast locking of the phase loop unit (200) and generation of a stable output signal. In addition, it can also play a filtering role to remove unnecessary signals.

The voltage-controlled oscillator (400) may include an oscillator that generates high-frequency vibrations using an LC circuit, an amplifier that amplifies and outputs an oscillation signal, and a variable-capacity diode whose capacitance changes according to the control voltage.

The voltage-controlled oscillation unit (400) amplifies and outputs an oscillation signal generated from the oscillation circuit, and applies a control voltage to control the oscillation frequency from the variable-capacity diode. When the control voltage increases, the capacitance value of the variable-capacity diode decreases, thereby increasing the oscillation frequency, and when the control voltage decreases, the capacitance of the variable-capacity diode increases, thereby decreasing the oscillation frequency.

The voltage-controlled oscillator (400) changes the frequency of the oscillation circuit according to the input control voltage to output the desired frequency. It is effective for the output frequency to increase in proportion to the input control voltage. It is effective for the voltage-controlled oscillator (400) to detect and compensate for errors using a circuit similar to the phase frequency detection unit (220) of the preceding phase loop unit (200).

In addition, the voltage control oscillator (400) is not limited thereto, and may include a oscillation circuit including an LC or RC circuit, a voltage control circuit including a voltage detection device, and an output circuit that amplifies an output signal of the oscillation circuit and converts it into a waveform. The oscillation circuit oscillates in a certain frequency range, and the voltage control circuit measures an input voltage or current to control the frequency of the oscillation circuit, and applies it to an inductor or capacitor of the oscillation circuit to convert the frequency. In addition, it is also possible to use an infrared IC. That is, when light is generated from infrared, an electric signal can be generated. It may include a tuning diode that controls the output frequency according to the input voltage, a capacitor that determines the output frequency, and an amplifier that amplifies the output signal. That is, a configuration in which the control voltage is adjusted, the capacity of the capacitor is varied according to the control voltage, and the output frequency changes accordingly is also possible.

The voltage-controlled oscillator (400) may further include an oscillation circuit that determines the oscillation frequency, a capacitor that stores and discharges voltage, a voltage controller that controls the oscillation frequency, and a temperature compensation circuit that compensates for the temperature. The size and discharge speed of the capacitor affect the oscillation frequency, and frequency synthesis is possible through the voltage controller. In addition, it is possible to secure the oscillation frequency from changing depending on the temperature through the temperature compensation circuit.

The division unit (500) of the present embodiment includes a first division unit (510) that reduces the relative phase difference between the output of the phase loop unit (200) and the input of the voltage control oscillator unit (400), and a second division unit (520) that divides the output frequency of the voltage control oscillator unit (400) to adjust the output frequency of the phase loop unit (200).

The first division unit (510) divides the output frequency of the voltage control oscillator unit (400) and provides it to the second division unit (520). It is effective for the first division unit (510) to divide the input frequency into integer multiples of 2. The first division unit (510) is implemented using a logic gate, but uses a device that divides by 2 or 4. The first division unit (510) can also send the divided frequency to the phase loop unit (200) through a feedback path to generate an error signal.

The second division unit (520) has a constant division ratio, divides the output of the first division unit (510), and then sends the divided frequency to the phase loop unit (200) through a feedback path to generate an error signal. It is effective for the second division unit (520) to have a structure such as a counter or a binomial divider. Accuracy and resolution can be improved in frequency synthesis through the second division unit (520).

The high-pass filter unit (600) can improve stability and performance by removing low frequencies from the output signal, and can reduce the size of the error signal. In addition, the high-pass filter unit (600) can also produce a desired output frequency. It is effective for the high-pass filter unit (600) to use an RC filter or a digital filter.

The present invention is not limited to the above-described embodiments, and various other embodiments are possible. Below, a 5G-specific network-compatible frequency synthesis module according to another embodiment of the present invention is described. In the following description, any description that overlaps with the description of the above-described embodiment is omitted. In addition, the technology of the description described below can be applied to the above-described embodiments.

FIG. 3 is a drawing for explaining a 5G specialized network responsive frequency synthesis module according to another embodiment of the present invention.

FIG. 4 is a drawing for explaining a phase loop section according to another embodiment.

Fig. 5 is a drawing for explaining a band output unit according to another embodiment.

FIG. 6 is a drawing for explaining a low pass selector according to another embodiment.

As illustrated in FIGS. 3 to 6, the 5G specialized network-compatible frequency synthesis module according to another embodiment of the present invention comprises an input filter unit (1000) for removing noise from an input signal, a phase loop unit (1100) for detecting a difference between a signal provided from the input filter unit (1000) and an output signal of a voltage-controlled oscillator (1300) fed back through a low-pass selector (170) to control the voltage-controlled oscillator (1300), an operational amplifier unit (1200) for amplifying the output signal of the phase loop unit (1100) and providing it to the voltage-controlled oscillator (1300), a voltage-controlled oscillator unit (1300) for changing the output frequency according to the signal provided by the operational amplifier unit (1200), a band output unit (1400) for selecting and outputting a frequency band, an amplifier unit (1500) for receiving and amplifying the output of the band output unit (1400) as a feedback, and a frequency-dividing unit for outputting the output of the amplifier unit (1500). It includes a division unit (1600) and a low pass selection unit (1700) that provides the output of the division unit (1600) to a phase loop unit (1100).

The input filter unit (1000) can generate a signal within a target frequency range by passing a specific frequency band of an input signal, remove signal noise, and extract a signal within a desired band.

It is effective to use a bandpass filter as the input filter unit (1000), and an LC filter or a digital filter can be used as the bandpass filter. The input filter unit (1000) of this other embodiment can be configured in various ways depending on the input frequency band and the desired frequency band. If the input frequency band is narrow and the desired frequency band is narrow, an LC filter is used for the configuration, but if the input frequency band is wide or the desired frequency band is wide, it is effective to use a digital filter. At this time, it is possible to use an FIR (Filtering Infinite Response) filter or an IIR (Infinite Impulse Response) filter as the digital filter.

The phase loop unit (1100) includes a phase frequency detection unit (1110) that detects a phase difference between an output signal of an input filter unit (1000) and an output signal of a voltage control oscillator unit (1300), a charge pump unit (1120) that generates an output voltage based on the output of the phase frequency detection unit (1110), and a counter unit (1130) that adjusts the frequency of the voltage control oscillator unit (1300) that has passed through a low pass selection unit (1700) and provides it to the phase frequency detection unit (1110).

The phase frequency detection unit (1110) receives the output of the input filter unit (1000) and the output of the counter unit (1130) and detects the frequency and phase difference between these two signals. Through this, the frequency of the voltage control oscillator unit (1300) can be adjusted, and signal synchronization becomes possible. The phase frequency detection unit (1110) can be composed of a D preflop and an XOR gate.

The charge pump unit (1120) amplifies the output signal of the phase frequency detection unit (1110) and controls the control voltage of the voltage control oscillator unit (1300). Such a charge pump (1120) is configured using a MOSFET, and changes the output by controlling different MOSFETs when the output of the phase frequency detection unit (1110) increases and decreases, and at this time, the amount of change is proportional to the amount of change in the output of the phase frequency detection unit (1110).

The counter (1130) counts the input signal, that is, divides a specific frequency. In addition, it maintains a constant ratio between the output frequency of the voltage-controlled oscillator (1300) and the output frequency of the phase loop unit (1100). The counter unit (1130) matches the reference input clock frequency to the output frequency of the voltage-controlled oscillator (1300). The counter unit (1130) can control the output by changing the count value. The counter (1130) is a digital counter that uses the count value to control the output frequency. In order to increase the frequency, the count value decreases, and in order to decrease the frequency, the count value increases. Of course, the counter is composed of a D flip-flop, and it is possible to start from the end of the previous cycle when counting. Of course, the counter can be initialized according to a reset signal.

The operational amplifier (1200) amplifies the output of the phase loop unit (1100) and stabilizes the overall circuit operation to adjust the voltage level of the output signal. Through this, the output signal frequency of the voltage control oscillator unit (1300) can be adjusted.

The operational amplifier unit (1200) of the present embodiment can be used as a loop filter. That is, it can enable fast locking of the phase loop unit (1100) and generation of a stable output signal. In addition, it can also play a filtering role to remove unnecessary signals.

The voltage-controlled oscillator (1300) includes an oscillator that generates high-frequency vibrations using an LC circuit, an amplifier that amplifies and outputs an oscillation signal, and a variable-capacity diode whose capacitance changes according to a control voltage.

The voltage-controlled oscillation unit (1300) amplifies and outputs an oscillation signal generated from the oscillation circuit, and applies a control voltage to control the oscillation frequency from the variable-capacity diode. When the control voltage increases, the capacitance value of the variable-capacity diode decreases, thereby increasing the oscillation frequency, and when the control voltage decreases, the capacitance of the variable-capacity diode increases, thereby decreasing the oscillation frequency.

The voltage-controlled oscillator (1300) changes the frequency of the oscillation circuit according to the input control voltage to output the desired frequency. It is effective for the output frequency to increase in proportion to the input control voltage. It is effective for the voltage-controlled oscillator (1300) to detect and compensate for errors using the same circuit as the phase frequency detection unit (1110) of the preceding phase loop unit (1100).

In addition, the voltage control oscillator (1300) is not limited thereto, and may include a oscillation circuit including an LC or RC circuit, a voltage control circuit including a voltage detection device, and an output circuit that amplifies an output signal of the oscillation circuit and converts it into a waveform. The oscillation circuit oscillates in a certain frequency range, and the voltage control circuit measures an input voltage or current to control the frequency of the oscillation circuit, and applies it to an inductor or capacitor of the oscillation circuit to convert the frequency. In addition, it is also possible to use an infrared IC. That is, when light is generated from infrared, an electric signal can be generated. It may include a tuning diode that controls the output frequency according to the input voltage, a capacitor that determines the output frequency, and an amplifier that amplifies the output signal. That is, a configuration in which the control voltage is adjusted, the capacity of the capacitor is varied according to the control voltage, and the output frequency changes accordingly is also possible.

The voltage-controlled oscillator (1300) may further include an oscillation circuit that determines an oscillation frequency, a capacitor that stores and discharges voltage, a voltage controller that controls an oscillation frequency, and a temperature compensation circuit that compensates for temperature. The size and discharge speed of the capacitor affect the oscillation frequency, and frequency synthesis is possible through the voltage controller. In addition, it is possible to secure the oscillation frequency from changing depending on temperature through the temperature compensation circuit.

The band output section (1400) includes a first SPDT switch (1410) located at the input terminal, a second SPDT switch (1420) located at the output terminal, a first band pass filter (1430) and a second band pass filter (1440) connected in parallel between the two switches (1410, 1420), and a coupler (1450) that transmits the output of the second SPDT switch (1420) to the outside.

The first and second SPDT switches (1410, 1420) can selectively allow the output signal of the voltage control oscillator (1300) to pass through a band pass filter to control the frequency transmitted to the output terminal.

The first SPDT switch (1410) converts one input signal into two output signals. This enables distribution of the output signal of the voltage-controlled oscillator (1300). That is, the first SPDT switch (1410) transmits the output signal of the voltage-controlled oscillator (1300) to the first band-pass filter (1430) or the second band-pass filter (1440). This enables selection of a desired frequency band. It is effective that the first SPDT switch (1410) is switched by an external switch control signal.

It is effective for the first band pass filter (1430) to use a filter that passes a lower bandwidth among the pass bandwidths, and for the second band pass filter (1440) to use a filter that passes an upper bandwidth. In the present embodiment, it is effective for the first and second band pass filters (1430, 1440) to filter signals of the same band. Among these, it is effective for the first band pass filter (1430) to pass frequencies lower than the center frequency of the pass bandwidth, and for the second band pass filter (1440) to pass frequencies higher than the center frequency. In this way, it is effective to extract signals of a desired frequency band by passing through the band pass filters. In other words, it is possible to pass signals of a desired band and block signals of other frequency bands.

When the output of the voltage-controlled oscillator (1300) passes through the first band-pass filter (1430) by the first SPDT switch (1410), it is effective that only the lower bandwidth passes, and when it passes through the second band-pass filter (1440), only the upper bandwidth passes. Of course, this describes selective passage, but is not limited thereto, and simultaneous passage may also be possible through division.

The second SPDT switch (1420) is effective in selecting one of the two inputs and transmitting it to the output. The second SPDT switch (1420) is effective in transmitting the signal of the first band pass filter (1430) or the signal of the second band pass filter (1440). The output of the second SPDT switch (1440) is transmitted to the coupler (1450).

The coupler (1450) performs stable signal transmission to improve the output stability of the entire circuit. The coupler (1450) transmits the output signal to the outside and transmits it to another circuit. It is effective that the coupler (1450) is configured with a microstrip line structure. Through this, signal loss can be minimized when transmitting the output signal, thereby ensuring circuit stability.

The signal of the coupler (1450) can be transmitted to the outside through the output terminal, or transmitted to the phase loop unit (1100) through the amplifier unit (1500), the divider unit (1600), and the low pass selector unit (1700).

The amplifier (1500) can accurately measure the error signal by amplifying it through the gain and thereby control the output frequency of the voltage-controlled oscillator (1300). That is, it is effective for the amplifier (1500) to measure the signal input through the coupler (1450) and generate a difference signal with respect to the output frequency of the voltage-controlled oscillator (1300). The amplifier (1500) can amplify the output of the coupler (1450) and provide it to the frequency divider (1600) to control the output frequency more accurately.

The division unit (1600) divides the output of the voltage control oscillator unit (1300) into a clock signal of a fixed frequency. At this time, it is effective that the division is determined by the division ratio. In addition, the division unit (1600) can enable the frequency of the phase loop unit (1100) to be changed. Through such a division unit (1600), it is possible to be sensitive to frequency changes and thus enable rapid frequency changes.

The low pass selector (1700) includes a third SPDT switch (1710) located at the input terminal, a fourth SPDT switch (1720) located at the output terminal, and a first low pass filter (1730) and a second low pass filter (1740) connected in parallel between the two switches.

The third and fourth SPDT switches (1710, 1720) can selectively allow the output signal from the amplifier (1500) and divider (1600) to pass through a low pass filter (1730, 1740) to control the frequency transmitted to the phase loop section.

The third SPDT switch (1710) converts one input signal into two output signals. The third SPDT switch (1710) transfers the output signal of the divider (1600) to the first low-pass filter (1730) or the second low-pass filter (1740). This makes it possible to select a desired frequency band. It is effective that the third SPDT switch (1710) is switched by an external switch control signal.

The first and second low-pass filters (1730, 1740) block signals above a certain level and pass only signals below a certain level. At this time, the first and second low-pass filters (1730, 1740) have set cutoff frequencies, and the first and second low-pass filters (1730, 1740) are defined based on these. That is, the first low-pass filter (1730) passes signals having a frequency lower than the cutoff frequency, and the second low-pass filter (1740) passes signals having a frequency higher than the cutoff frequency.

The first low-pass filter (1730) allows a frequency band with low frequency characteristics and blocks a high frequency band. The second low-pass filter (1740) allows a frequency band with high frequency characteristics and blocks a low frequency band. It is effective that the cutoff frequency is the center frequency.

It is effective that the output of the voltage-controlled oscillator fed back by the third SPDT switch (1710) passes only the low frequency bandwidth when passing through the first low-pass filter (1730), and passes only the high frequency bandwidth when passing through the second low-pass filter (1740). Of course, this describes selective passing, but is not limited thereto, and simultaneous passing may also be possible through division.

The fourth SPDT switch (1720) is effective in selecting one of two inputs and transmitting it to the output. The fourth SPDT switch (1720) is effective in transmitting the signal of the first low-pass filter (1730) or the signal of the second low-pass filter (1740). The output of the fourth SPDT switch (1720) is transmitted to the phase loop unit (1100).

Below, an automatic tuning system for automatically tuning a frequency synthesis module having the above-described structure is described.

FIG. 7 is a drawing for explaining an automatic tuning system according to one embodiment of the present invention.

As illustrated in FIG. 7, the automatic tuning system according to the present embodiment includes a frequency synthesis module (2000) that detects a phase difference between the frequencies of a reference signal and an output signal, receives feedback to reduce the phase difference within a range of a set reference level, and adjusts an output signal; an automatic tuning unit (2100) that controls the frequency synthesis module (2000) in an open loop state to correct the frequency; and a control unit (2200) that determines a correction level corresponding to the phase difference between the frequency of a divided output signal and the frequency of a reference signal.

A frequency synthesis module (2000) may include a low-pass filter section for low-passing a reference signal, a phase loop section for detecting a difference between an input signal passing through the low-pass filter section and an output signal of a divided voltage-controlled oscillator section to control the voltage-controlled oscillator section, an operational amplifier section for amplifying the output signal of the phase loop section and providing the amplified signal to the voltage-controlled oscillator section, a voltage-controlled oscillator section for changing the output frequency according to the provided signal, a division section for dividing the output frequency of the voltage-controlled oscillator section and providing the divided signal to the phase loop section, and a high-pass filter section for high-passing the output of the voltage-controlled oscillator section.

In addition, it is effective that the frequency synthesis module (2000) includes an input filter section for removing noise from an input signal, a phase loop section for detecting a difference between a signal provided from the input filter section and an output signal of a voltage-controlled oscillator fed back through a low-pass selector section to control the voltage-controlled oscillator section, an operational amplifier section for amplifying the output signal of the phase loop section and providing it to the voltage-controlled oscillator section, a voltage-controlled oscillator section for changing the output frequency according to the signal provided from the operational amplifier section, a band output section for selecting a frequency band and outputting it, an amplifier section for receiving feedback on the output of the band output section and amplifying it, a division section for dividing the output of the amplifier section and outputting it, and a low-pass selector section for providing the output of the division section to the phase loop section.

It is effective that the voltage-controlled oscillator of the frequency synthesis module (2000) of the present example includes a bank having a plurality of channels that generate fixed frequencies. The banks can facilitate the control of a plurality of channels. The automatic tuning unit (2100) allows the frequency synthesis module (2000) to operate in an open loop state. The frequency synthesis module is controlled to select a bank of the voltage-controlled oscillator based on a set compensation level. In addition, whether a bank matching the compensation level is selected can be fed back to the control unit (2200) to adjust the frequency signal.

The control unit (2200) compares a frequency signal whose reference frequency is an integer division signal with a reference frequency signal to determine a correction level for selecting a bank corresponding to the output frequency. The correction level can be determined so that a bank is selected by considering the integer division value.

Although the technical idea of the present invention described above has been specifically described in preferred embodiments, it should be noted that the above-described embodiments are for the purpose of explanation and not for the purpose of limitation. In addition, the present invention will be understood by those of ordinary skill in the art that various embodiments are possible within the scope of the technical idea of the present invention.

100: Low pass filter section 200, 1100: Phase loop section
210, 240: Counter section 220: Phase frequency detection section
230: Charge pump section 300, 1200: Operational amplifier section
400, 1300: Voltage control oscillator 500, 1600: Divider
600: High pass filter section 1000: Input filter section
1400: Band Output 1450: Coupler
1410, 1420, 1710, 1720: SPDT switch
1430, 1440: Band pass filter 1500: Amplifier
1700: Low pass selector 1730, 1740: Second low pass filter
2000: Frequency synthesis module 2100: Automatic tuning unit
2200: Control Unit

Claims (6)

A low-pass filter section that low-passes the reference signal;
A phase loop section that detects the difference between the input signal passing through the above low-pass filter section and the output signal of the divided voltage control oscillator section to control the voltage control oscillator section;
An operational amplifier section that amplifies the output signal of the above phase loop section and provides it to a voltage-controlled oscillator section;
A voltage-controlled oscillator that changes the output frequency according to a supplied signal;
A division unit for dividing the output frequency of the voltage control oscillator and providing it to the phase loop unit; and
A frequency synthesis module for a 5G specialized network, characterized by including a high-pass filter section for high-passing the output of a voltage-controlled oscillator section.
In the first paragraph,
A frequency synthesis module corresponding to a 5G specialized network, characterized in that the phase loop section includes a first counter section for counting a reference input signal passing through a low-pass filter section, a phase frequency detection section for detecting a phase difference between an output signal of the first counter section and an output signal of a voltage-controlled oscillator section, a charge pump section for generating an output voltage based on the output of the phase frequency detection section, and a second counter section for adjusting the frequency of the voltage-controlled oscillator section passing through a division section and providing it to the phase frequency detection section.
Input filter section that removes noise from the input signal;
A phase loop section that detects the difference between the signal provided from the above input filter section and the output signal of the voltage control oscillator fed back through the low pass selector section to control the voltage control oscillator;
An operational amplifier section that amplifies the output signal of the above phase loop section and provides it to a voltage-controlled oscillator section;
A voltage-controlled oscillator section that changes the output frequency according to a signal provided by the above operational amplifier section;
Band output section that selects and outputs a frequency band;
An amplifier section that receives and amplifies the output of the above band output section;
A division unit that divides and outputs the output of the above amplifier unit; and
A 5G-specific network-compatible frequency synthesis module characterized by including a low-pass selection unit that provides the output of the above-mentioned division unit to a phase loop unit.
In the third paragraph,
A frequency synthesis module for a 5G specialized network, characterized in that the phase loop section includes a phase frequency detection section for detecting a phase difference between an output signal of an input filter section and an output signal of a voltage-controlled oscillator section, a charge pump section for generating an output voltage based on the output of the phase frequency detection section, and a counter section for adjusting the frequency of the voltage-controlled oscillator section that has passed through a low-pass selection section and providing it to the phase frequency detection section.
In the third paragraph,
A frequency synthesis module corresponding to a 5G specialized network, characterized in that the band output section includes a first SPDT switch located at an input terminal, a second SPDT switch located at an output terminal, a first band pass filter and a second band pass filter connected in parallel between the two switches, and a coupler that transmits the output of the second SPDT switch to the outside.
A frequency synthesis module that detects the phase difference between the frequencies of a reference signal and an output signal, receives feedback, and adjusts the output signal so that the phase difference is reduced within the range of a set reference level;
An automatic tuning unit for correcting the frequency by controlling the frequency synthesis module in an open loop state; and
An automatic tuning system characterized by including a control unit that determines a compensation level corresponding to a phase difference between the frequency of a divided output signal and the frequency of a reference signal.