CN114374401B - Automatic gain control radio frequency receiver - Google Patents
Automatic gain control radio frequency receiver Download PDFInfo
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- CN114374401B CN114374401B CN202111556952.8A CN202111556952A CN114374401B CN 114374401 B CN114374401 B CN 114374401B CN 202111556952 A CN202111556952 A CN 202111556952A CN 114374401 B CN114374401 B CN 114374401B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/52—Transmission power control [TPC] using AGC [Automatic Gain Control] circuits or amplifiers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application relates to an automatic gain control radio frequency receiver, which comprises a wiring terminal for receiving radio frequency signals, wherein the wiring terminal is connected with a low-noise amplifier, the low-noise amplifier is connected with a voltage-current converter, the voltage-current converter is respectively connected with two mixers, each mixer is connected with a transimpedance amplifier, each transimpedance amplifier is connected with a low-pass filter, each low-pass filter is connected with a variable gain amplifier, each variable gain amplifier is connected with a digital-to-analog converter, and the two digital-to-analog converters are commonly connected with a processing control module; the low-noise amplifier, the voltage-to-current converter, the mixer, the transimpedance amplifier and the variable gain amplifier are used for coarsely and finely adjusting gain coefficients; the processing control module is used for calculating the frequency of the radio frequency signal and controlling the low-noise amplifier, the voltage-current converter, the mixer, the transimpedance amplifier and the variable gain amplifier to adjust the gain coefficient. The application can realize a wider gain coefficient adjusting range and high-precision adjustment.
Description
Technical Field
The application relates to the field of radio frequency technology, in particular to an automatic gain control radio frequency receiver.
Background
A radio frequency receiver is a device that can remotely receive a radio frequency signal and then reverse modulate the signal to recover it to an electrical information source. Currently, radio frequency receivers are widely used in various fields of vehicle monitoring, remote control, and telemetry. The radio frequency receiver is mainly divided into a superheterodyne receiver, a zero intermediate frequency receiver and a near zero intermediate frequency receiver.
The zero intermediate frequency receiver has the advantages of easy integration, small volume and low power consumption, is greatly influenced by direct current offset, and has poor noise and linearity. Specifically, when the phase difference of the two local oscillation signals is not accurate to 90 degrees, the two paths of signals overlap, distortion is generated, a higher error rate is caused, and baseband I/Q signal mismatch is caused. Similarly, gain mismatch can also cause degradation in receiver performance. Therefore, in the process of manufacturing the zero intermediate frequency receiver, the requirements on the performance of the radio frequency receiver are generally higher, and the low-noise amplification gain range is wide enough and thin enough, and the wide-range high-adjustment precision automatic gain control is also required.
Disclosure of Invention
In order to enable automatic gain control with a wide range of high accuracy, the present application provides an automatic gain controlled radio frequency receiver.
The application provides an automatic gain control radio frequency receiver which adopts the following technical scheme:
The automatic gain control radio frequency receiver comprises a receiving terminal for receiving radio frequency signals, wherein the receiving terminal is connected with a low-noise amplifier, the low-noise amplifier is connected with a voltage-current converter, the voltage-current converter is respectively connected with two mixers, each mixer is connected with a transimpedance amplifier, each transimpedance amplifier is connected with a low-pass filter, each low-pass filter is connected with a variable gain amplifier, each variable gain amplifier is connected with a digital-to-analog converter, and the two digital-to-analog converters are commonly connected with a processing control module;
the phase difference of local oscillation signals accessed by the two mixers is 90 degrees;
the low-noise amplifier, the voltage-to-current converter, the mixer, the transimpedance amplifier and the variable gain amplifier are all used for coarse adjustment of gain coefficients;
another variable gain amplifier is used to fine tune the gain factor;
The processing control module is also respectively connected with the low-noise amplifier, the voltage-current converter, the frequency mixer, the transimpedance amplifier and the variable gain amplifier, and is used for calculating the frequency value of the radio frequency signal and controlling the low-noise amplifier, the voltage-current converter, the frequency mixer, the transimpedance amplifier and the variable gain amplifier to adjust gain coefficients.
Through adopting above-mentioned technical scheme, the low noise amplifier, voltage-current converter, the mixer, the transimpedance amplifier and a variable gain amplifier that set up all can carry out coarse adjustment to gain factor, and each has certain accommodation, and another variable gain amplifier can carry out fine adjustment, through adjusting low noise amplifier, voltage-current converter, the mixer, transimpedance amplifier and variable gain amplifier, can make up the gain factor that forms wide range, because variable gain amplifier can carry out fine adjustment, consequently, can realize the regulation of gain factor that is wider simultaneously, still can realize high accuracy and adjust.
Optionally, the gain steps of the low noise amplifier, the voltage-to-current converter, the mixer, the transimpedance amplifier, and the variable gain amplifier for coarse gain factor are at least 2dB;
the gain step of the variable gain amplifier for fine tuning the gain factor is 1dB.
By adopting the technical scheme, the gain coefficients of the low-noise amplifier, the voltage-current converter, the mixer, the transimpedance amplifier and the variable gain amplifier for coarse adjustment of the gain coefficients can be adjusted, the gain coefficient which is relatively close to the target gain coefficient can be obtained, and then the gain coefficient of the variable gain amplifier for fine adjustment of the gain coefficient can be adjusted, so that the target gain coefficient can be reached, and high-precision adjustment can be realized.
Optionally, the device further comprises two peak detection modules, wherein the two peak detection modules are respectively connected with the output ends of the two transimpedance amplifiers and are used for detecting the peak value of the output voltage of the transimpedance amplifiers and outputting a peak detection signal;
The processing control module is connected with the peak detection module and is used for reducing gain coefficients of the low-noise amplifier, the voltage-current converter, the mixer and the transimpedance amplifier when the voltage value reflected by the received peak detection signal exceeds a threshold value.
By adopting the technical scheme, the gain coefficients of the low-noise amplifier, the voltage-current converter, the mixer and the transimpedance amplifier can be reduced, so that the later-stage saturation can be avoided.
Optionally, the system further comprises two bandwidth calibration modules, wherein the two bandwidth calibration modules are respectively connected with the output ends of the two low-pass filters.
By adopting the technical scheme, the problems of distortion and the like of signals are prevented.
Optionally, the device further comprises a quadrature offset calibration module, and the quadrature offset calibration module is respectively connected with the two mixers.
By adopting the technical scheme, the quadrature offset calibration module can calibrate the phase difference of the I signal and the Q signal, and prevent the two paths of signals from overlapping and further forming distortion.
Optionally, the device further comprises two direct current offset calibration modules, wherein the two direct current offset calibration modules are respectively connected with the two mixers and used for compensating direct current leakage generated by the mixers.
By adopting the technical scheme, when the radio frequency signal and the local oscillator signal are mixed, the local oscillator signal possibly enters the radio frequency port, and the radio frequency signal also possibly enters the local oscillator port, so that direct current components are generated by self-mixing, and the direct current components can influence the mixed signal, and therefore, a part of direct current imbalance can be eliminated through the direct current imbalance calibration module.
Optionally, the device further comprises a check group and two linearity detection modules, wherein the two linearity detection modules are respectively connected with the two mixers and used for detecting linearity and outputting a linearity detection signal;
the processing control module is respectively connected with the two linearity detection modules and is also used for controlling the check group to be connected with and replace a group of mixers, transimpedance amplifiers, low-pass filters, variable gain amplifiers and digital-to-analog converters with abnormal linearity when the linearity value reflected by any received linearity detection signal exceeds a preset linearity range;
The check group comprises the mixer, a transimpedance amplifier, a low-pass filter, a variable gain amplifier, a digital-to-analog converter and a linearity detection module.
By adopting the technical scheme, the check group can replace an abnormal group of mixer, transimpedance amplifier, low-pass filter, variable gain amplifier and digital-to-analog converter when the receiver is abnormal, so as to position the abnormality and further ensure the accuracy of the frequency of the radio frequency signal received by the receiver.
Optionally, the process control module is configured to:
acquiring a linearity value exceeding a preset linearity range before accessing a check group, and marking the linearity value as an original linearity value;
Determining the frequency value of the radio frequency signal according to the mixed signals output by the two digital-to-analog converters, and marking the frequency value as a frequency detection value;
Obtaining a linearity value of the check group after accessing the check group, and recording the linearity value as a check linearity value;
Determining the frequency value of the radio frequency signal according to the mixed signals output by the two digital-to-analog converters, and marking the frequency value as a frequency check value;
judging whether the frequency check value is the same as the frequency detection value, if so, adjusting and recording parameters enabling the check linearity value to be in a preset linearity range for output;
If not, outputting an alarm signal.
By adopting the technical scheme, when the frequency check value and the frequency detection value are the same, the replaced mixer, the transimpedance amplifier, the low-pass filter, the variable gain amplifier and the digital-analog converter are not abnormal, the parameters added in the mixing process are set to be problematic, and when the frequency check value and the frequency detection value are different, the replaced mixer, the transimpedance amplifier, the low-pass filter, the variable gain amplifier and the digital-analog converter are abnormal, and the maintenance of workers can be timely reminded through alarming.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The low-noise amplifier, the voltage-current converter, the mixer, the transimpedance amplifier and the variable gain amplifier can be arranged to be capable of roughly adjusting the gain coefficient, each variable gain amplifier has a certain adjusting range, the other variable gain amplifier can be finely adjusted, the low-noise amplifier, the voltage-current converter, the mixer, the transimpedance amplifier and the variable gain amplifier can be combined to form a wide range of gain coefficient, and the variable gain amplifier can be finely adjusted, so that the wide gain coefficient adjusting range is realized, and meanwhile, the high-precision adjustment can be realized;
2. The peak detection module can detect the peak value of the current output by the transimpedance amplifier, and when the peak value exceeds a threshold value, the gain coefficients of the low-noise amplifier, the voltage-current converter, the mixer and the transimpedance amplifier are reduced to avoid the later-stage saturation;
3. Through setting up the check group, can replace unusual a set of mixer, transimpedance amplifier, low pass filter, variable gain amplifier and digital analog converter when the receiver takes place unusually to fix a position unusually, and then ensure the accuracy of the frequency of the radio frequency signal that the receiver received.
Drawings
Fig. 1 is a schematic circuit diagram of an automatic gain control radio frequency receiver according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a control system of an automatic gain control radio frequency receiver according to an embodiment of the present application.
Reference numerals illustrate: 1. a receiving terminal; 2. a low noise amplifier; 3. a voltage-to-current converter; 4. a mixer; 41. a quadrature offset calibration module; 42. a direct current offset calibration module; 43. a linearity detection module; 5. a transimpedance amplifier; 51. a peak detection module; 6. a low pass filter; 61. a bandwidth calibration module; 7. a variable gain amplifier; 8. a digital-to-analog converter; 9. a process control module; 10. and (5) checking the group.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings 1-2 and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The embodiment of the application discloses an automatic gain control radio frequency receiver. Referring to fig. 1 and 2, the automatic gain controlled radio frequency receiver includes a receiving terminal 1, a low noise amplifier 2, a voltage-to-current converter 3, a mixer 4, a transimpedance amplifier 5, a low pass filter 6, a variable gain amplifier 7, a digital-to-analog converter 8, and a process control module 9. The radio frequency receiver has the advantages of wide and thin low-noise amplification gain range and wide-range high-adjustment-precision automatic gain control.
The receiving terminal 1 is used for receiving a radio frequency signal, and may be a receiving antenna.
The low noise amplifier 2 is connected to the receiving terminal 1 for amplifying the radio frequency signal. Because the noise coefficient generated by the low-noise amplifier 2 is low, the radio frequency signal with low noise coefficient can be obtained after the amplification by the low-noise amplifier 2.
The voltage-to-current converter 3 is connected to the low noise amplifier 2 and is used for converting the voltage-form radio frequency signal into the current-form radio frequency signal so as to drive the mixer 4 to mix.
In consideration of the problem of image interference generated during the mixing process, in the present application, the mixers 4 are provided with two to perform I/Q demodulation while reducing the complexity of the system.
The two mixers 4 are respectively connected with the voltage-current converter 3 and are used for mixing the radio frequency signals with the local oscillation signals to obtain mixed signals. It should be noted that the phase difference of the local oscillation signals accessed by the two mixers 4 must be 90 °, otherwise, the Q signal will be mixed into the I signal and interfere with the I signal, meanwhile, the I signal will also be mixed into the Q signal and interfere with the Q signal, and further, the overlapping of the two signals will cause signal distortion and increase the error rate. In one specific example, one local oscillator signal is 0 ° or 180 ° in phase and the other local oscillator signal is 90 ° or 270 °. Preferably, in order to ensure that the two local oscillator signals are exactly orthogonal, the two local oscillator signals are preferably a sine signal and a cosine signal.
It will be appreciated that in actual demodulation, the quadrature accuracy of the two local oscillator signals will vary with processing and temperature conditions. Thus, to alleviate signal distortion and error problems caused by overlapping two signals, two quadrature offset calibration modules 41 are included.
The two quadrature offset calibration modules 41 are respectively connected to the two mixers 4, and are used for calibrating the two local oscillation signals when the phase difference of the two local oscillation signals is not 90 °. Preferably, the quadrature offset calibration block 41 is QEC.
It should be noted that, in addition to the phase difference of the two local oscillation signals in the I/Q demodulation process, the demodulation process may be affected, and there may be interference between the radio frequency signal and the local oscillation signals. Specifically, a part of local oscillation signals may leak to the radio frequency port, and correspondingly, a part of radio frequency signals may also leak to the local oscillation port, so that self-mixing occurs in the mixing process, and further direct current leakage occurs.
To this end, the radio frequency receiver of the present application further includes a DC offset calibration module 42. The dc offset adjustment module 42 is provided with two. The two dc offset calibration modules 42 are respectively connected to the two mixers 4 to compensate dc leakage generated by the mixers 4.
Correspondingly, the transimpedance amplifier 5 is also provided with two. The two transimpedance amplifiers 5 are respectively connected with the two mixers 4 and are used for converting current into voltage and amplifying and outputting the voltage. The signal is amplified, and the amplification of the noise signal can be effectively restrained. Furthermore, the present application can partially eliminate the dc offset by injecting a controllable current at the input of the transimpedance amplifier 5.
The low-pass filters 6 are provided in two. The two low-pass filters 6 are respectively connected with the two transimpedance amplifiers 5 for eliminating the interference of high-frequency components in the mixed signal.
The variable gain amplifier 7 is provided with two. The two variable gain amplifiers 7 are respectively connected with two low-pass filters 6 for amplifying the mixed signal with only low-frequency components by a certain multiple, wherein the amplification can be adjusted according to actual needs.
The digital-to-analog converter 8 is also provided with two. Two digital-to-analog converters 8 are connected to two variable gain amplifiers 7, respectively.
The processing control module 9 is respectively connected with the two digital-to-analog converters 8, receives two paths of mixed signals with only low-frequency components, and obtains the frequency value of the radio frequency signal according to the two paths of mixed signals with only low-frequency components.
Up to this point, the functions of the radio frequency receiver have been basically implemented by the above-described receiving terminal 1, low noise amplifier 2, voltage-to-current converter 3, mixer 4, transimpedance amplifier 5, low pass filter 6, variable gain amplifier 7, digital-to-analog converter 8, and process control module 9.
It will be appreciated that the low noise amplifier 2, the voltage to current converter 3, the mixer 4, the transimpedance amplifier 5 and the variable gain amplifier 7 are all configured with corresponding gain coefficients. By setting different gain coefficients for the noise amplifier, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5, and the variable gain amplifier 7, an adjustable wide range of gain coefficients can be obtained.
Further, the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5, and one variable gain amplifier 7 are used for coarse adjustment of the gain factor, and the other variable gain amplifier 7 is used for fine adjustment of the gain factor.
Specifically, the gain steps of the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5, and the variable gain amplifier 7 for coarse gain factor are at least 2dB. In the application, the gain coefficient gears of the low-noise amplifier 2 are-18 dB, -12dB, 0dB, 12dB, 18dB and 24dB; the gain factor gears of the voltage-to-current converter 3, the mixer 4 and the transimpedance amplifier 5 are-6 dB, 0dB, 3dB, 6dB, 9dB, 12dB, 15dB, 18dB, 21dB and 24dB; the gain factor gears of the variable gain amplifier 7 for coarse tuning the gain factor are 0dB, 6dB, 12dB and 18dB.
The gain step of the variable gain amplifier 7 for fine-tuning the gain factor is 1dB, and in the present application, the tuning range of the gain factor is 0dB to 5dB.
When the gain coefficients of the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5 and the variable gain amplifier 7 are all set at the respective highest gear, the radio frequency receiver of the present application can obtain the maximum gain coefficient of 81dB.
Since the receiver is easily interfered by a strong interference signal of the high-frequency loop at both sides of the receiving frequency when receiving the weak useful signal, so that the nonlinear device is saturated and nonlinear distortion is generated, which hinders communication and even causes the performance of the receiver to be reduced, the radio frequency receiver of the present application further comprises a peak detection module 51.
The peak detection module 51 is provided with two. The two peak detection modules 51 are respectively connected to the output ends of the two transimpedance amplifiers 5, and are used for detecting the peak value of the output voltage of the transimpedance amplifiers 5 and outputting a peak detection signal. Preferably, the peak detection module 51 is a digital peak detector.
The processing control module 9 is further connected to the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5 and the peak detection module 51, respectively, to receive a peak detection signal, and is configured to control the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4 and the transimpedance amplifier 5 to adjust gain coefficients when a voltage value reflected by the received peak detection signal exceeds a threshold value, so as to reduce gain coefficients of the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4 and the transimpedance amplifier 5, thereby avoiding saturation of a subsequent stage. Of course, the processing control module 9 is further connected to two variable gain amplifiers 7 for controlling the two variable gain amplifiers 7 to adjust the gain coefficients.
The radio frequency receiver of the present application further comprises a bandwidth calibration module 61. The bandwidth calibration module 61 is provided with two. The two bandwidth calibration modules 61 are respectively connected to the output ends of the two low-pass filters 6, and are used for calibrating the bandwidths of the low-pass filters 6, so that the filtered mixed signal with only low-frequency components is more accurate.
For a radio frequency receiver, linearity is also an important indicator of its performance. Therefore, in order to obtain the radio frequency receiver with high linearity, the application can also judge the linearity of the radio frequency receiver.
In particular, the linearity of the rf receiver is determined by a plurality of parameters, for which purpose the application further comprises a linearity detection module 43.
The linearity detection modules 43 are two, and the two linearity detection modules 43 are respectively connected with the two mixers 4 and are used for detecting the linearity of the mixers 4 and outputting a linearity detection signal. Linearity can be measured by 1dB compression point, second order intermodulation point, and third order intermodulation point. The specific measurement mode is a conventional technical means of a person skilled in the relevant field, and the application is not described too much.
It will be appreciated that when the linearity does not reach the target range, this may be due to unreasonable settings of other parameters, and of course that there is a fault in the mixer 4, transimpedance amplifier 5, low pass filter 6, variable gain amplifier 7, digital to analog converter 8 and linearity detection module 43 on the I and Q channels, and therefore a check group 10 is also provided. The verification set 10 comprises a mixer 4, a transimpedance amplifier 5, a low pass filter 6, a variable gain amplifier 7, a digital-to-analog converter 8, a peak detection module 51, a bandwidth calibration module 61, a quadrature offset calibration module 41, a direct current offset calibration module 42 and a linearity detection module 43, which are connected in the same manner as mentioned above.
The processing control module 9 is respectively connected to the two linearity detection modules 43 to receive the linearity detection signals, and is further configured to control the check group 10 to access and replace the group of mixers 4, the transimpedance amplifier 5, the low-pass filter 6, the variable gain amplifier 7 and the digital-to-analog converter 8 with abnormal linearity when the linearity value reflected by any one of the received linearity detection signals exceeds the preset linearity range, so as to further determine the cause of the abnormal linearity. Wherein the mixer 4, transimpedance amplifier 5, low pass filter 6, variable gain amplifier 7 and digital to analog converter 8 of the check group 10 are considered to be free of faults.
The specific processing procedure of the processing control module 9 in the case of linear abnormality is as follows:
Firstly, the linearity value exceeding the preset linearity range is acquired before the check group 10 is accessed, and is recorded as an original linearity value. At the same time, the frequency value of the radio frequency signal is determined from the mixed signal of only the low frequency components acquired from the two digital-analog converters 8, and is noted as a frequency detection value.
Then, after the check group 10 is accessed, the linearity value of the check group 10 is obtained and is recorded as a check linearity value. Meanwhile, the frequency value of the radio frequency signal is determined from the mixed signal of only the low frequency components acquired from the two digital-to-analog converters 8, and is recorded as a frequency check value.
And then, judging whether the frequency check value is the same as the frequency detection value, if so, adjusting and recording parameters which enable the check linearity value to be in a preset linearity range for output, and if not, outputting an alarm signal.
It should be noted that, when the frequency check value is the same as the frequency detection value, since the check group 10 has no fault, the group of the mixer 4, the transimpedance amplifier 5, the low-pass filter 6, the variable gain amplifier 7, and the digital-to-analog converter 8 corresponding to the original linearity value has no fault, i.e., the abnormality of the original linearity value is caused by the abnormality of the related parameters. The relevant parameters are adjusted in the calibration set 10 so that the calibration linearity value is within the preset linearity range, and the parameters at this time are recorded for output. Further, the parameters of the set of mixers 4, the transimpedance amplifier 5, the low-pass filter 6, the variable gain amplifier 7 and the digital-to-analog converter 8 corresponding to the original linearity value are adjusted to the same value as the recorded parameters, so that the linearity within the preset linearity range can be obtained, and further the radio frequency receiver with higher linearity is obtained.
When the frequency check value is different from the frequency detection value, the group of mixers 4, the transimpedance amplifier 5, the low-pass filter 6, the variable gain amplifier 7 and the digital-to-analog converter 8 corresponding to the original linearity value are described to have faults, and maintenance or replacement is needed, and an alarm signal is output to remind an operator to check. The specific maintenance mode can be to replace the mixer 4, the transimpedance amplifier 5, the low-pass filter 6, the variable gain amplifier 7 and the digital-to-analog converter 8 in sequence, and successfully locate the fault position when the frequency detection value is the same as the frequency check value after replacement.
In the present application, the processing control module 9 is an MCU, where the preset linearity range can be adaptively designed according to actual needs.
The implementation principle of the automatic gain control radio frequency receiver in the embodiment of the application is as follows: the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5 and one variable gain amplifier 7 are all arranged to be capable of roughly adjusting gain factors, and each of the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5 and the one variable gain amplifier 7 is all provided with a certain adjusting range, and the other variable gain amplifier 7 is arranged to be capable of finely adjusting. By adjusting the low noise amplifier 2, the voltage-to-current converter 3, the mixer 4, the transimpedance amplifier 5, and the variable gain amplifier 7 to different gain factor steps, it is possible to achieve the effect of changing the gain factor in a 1dB gain step manner, achieving a wide-range high-accuracy adjustment of the gain factor. Meanwhile, the problems of direct loss, nonlinear distortion and the like can be restrained.
The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (6)
1. An automatic gain controlled radio frequency receiver, characterized by: the radio frequency signal receiving device comprises a receiving terminal (1) for receiving radio frequency signals, wherein the receiving terminal (1) is connected with a low-noise amplifier (2), the low-noise amplifier (2) is connected with a voltage-current converter (3), the voltage-current converter (3) is respectively connected with two mixers (4), each mixer (4) is connected with a transimpedance amplifier (5), each transimpedance amplifier (5) is connected with a low-pass filter (6), each low-pass filter (6) is connected with a variable gain amplifier (7), each variable gain amplifier (7) is connected with a digital-to-analog converter (8), and the two digital-to-analog converters (8) are commonly connected with a processing control module (9);
the phase difference of local oscillation signals accessed by the two mixers (4) is 90 degrees;
The low-noise amplifier (2), the voltage-to-current converter (3), the mixer (4), the transimpedance amplifier (5) and the variable gain amplifier (7) are all used for coarse adjustment of gain coefficients;
another variable gain amplifier (7) for fine tuning the gain factor;
The processing control module (9) is also respectively connected with the low-noise amplifier (2), the voltage-current converter (3), the mixer (4), the transimpedance amplifier (5) and the variable gain amplifier (7), and is used for calculating the frequency value of the radio frequency signal and controlling the low-noise amplifier (2), the voltage-current converter (3), the mixer (4), the transimpedance amplifier (5) and the variable gain amplifier (7) to adjust gain coefficients;
Wherein the automatic gain controlled radio frequency receiver further comprises: the device comprises a checking group (10) and two linearity detection modules (43), wherein the two linearity detection modules (43) are respectively connected with two mixers (4) and are used for detecting linearity and outputting linearity detection signals;
The processing control module (9) is respectively connected with the two linearity detection modules (43) and is also used for controlling the check group (10) to be connected with and replace a group of mixers (4), transimpedance amplifiers (5), low-pass filters (6), variable gain amplifiers (7) and digital-to-analog converters (8) with abnormal linearity when the linearity value reflected by any received linearity detection signal exceeds a preset linearity range;
the verification group (10) comprises the mixer (4), a transimpedance amplifier (5), a low-pass filter (6), a variable gain amplifier (7), a digital-to-analog converter (8) and a linearity detection module (43);
Wherein the process control module (9) is configured to: acquiring a linearity value exceeding a preset linearity range before accessing a check group (10), and recording the linearity value as an original linearity value; determining the frequency value of the radio frequency signal according to the mixed signals output by the two digital-to-analog converters (8), and marking the frequency value as a frequency detection value; obtaining a linearity value of the check group (10) after the check group (10) is accessed, and marking the linearity value as a check linearity value; determining the frequency value of the radio frequency signal according to the mixed signals output by the two digital-to-analog converters (8), and marking the frequency value as a frequency check value; judging whether the frequency check value is the same as the frequency detection value, if so, adjusting and recording parameters enabling the check linearity value to be in a preset linearity range for output; if not, outputting an alarm signal.
2. The automatic gain controlled radio frequency receiver of claim 1, wherein: the gain steps of the low noise amplifier (2), the voltage-to-current converter (3), the mixer (4), the transimpedance amplifier (5) and the variable gain amplifier (7) for coarse gain factor are at least 2dB;
the gain step of the variable gain amplifier (7) for fine tuning the gain factor is 1dB.
3. The automatic gain controlled radio frequency receiver of claim 2, wherein: the device further comprises two peak detection modules (51), wherein the two peak detection modules (51) are respectively connected with the output ends of the two transimpedance amplifiers (5) and are used for detecting the peak value of the output voltage of the transimpedance amplifiers (5) and outputting peak detection signals;
The processing control module (9) is connected with the peak detection module (51) and is used for reducing gain coefficients of the low-noise amplifier (2), the voltage-current converter (3), the mixer (4) and the transimpedance amplifier (5) when a voltage value reflected by a received peak detection signal exceeds a threshold value.
4. The automatic gain controlled radio frequency receiver of claim 3, wherein: the device further comprises two bandwidth calibration modules (61), wherein the two bandwidth calibration modules (61) are respectively connected with the output ends of the two low-pass filters (6).
5. The automatic gain controlled radio frequency receiver of claim 4, wherein: the circuit further comprises a quadrature offset calibration module (41), and the quadrature offset calibration module (41) is respectively connected with the two mixers (4).
6. The automatic gain controlled radio frequency receiver of claim 5, wherein: the direct current offset calibration device further comprises two direct current offset calibration modules (42), wherein the two direct current offset calibration modules (42) are respectively connected with the two mixers (4) and are used for compensating direct current leakage generated by the mixers (4).
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788511A (en) * | 2016-12-30 | 2017-05-31 | 北京时代民芯科技有限公司 | A kind of wideband radio receiver |
| CN112653486A (en) * | 2020-12-10 | 2021-04-13 | 北京时代民芯科技有限公司 | Broadband radio frequency transceiver capable of expanding receiving channel bandwidth |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6651021B2 (en) * | 2001-06-15 | 2003-11-18 | Skyworks Solutions, Inc. | System using adaptive circuitry to improve performance and provide linearity and dynamic range on demand |
| CN101895266B (en) * | 2010-07-20 | 2013-01-16 | 上海文络电子科技有限公司 | Mixed-signal automatic gain control system and control method thereof |
| CN202750081U (en) * | 2012-06-11 | 2013-02-20 | 桂林电子科技大学 | Software defined radio receiver comprising multi-level automatic gain control modules |
| CN104283574B (en) * | 2013-07-10 | 2017-04-12 | 清华大学 | software radio receiver circuit |
| US9698838B1 (en) * | 2015-12-23 | 2017-07-04 | Intel Corporation | Real-time blocker-adaptive broadband wireless receiver for low-power operation under co-existence in 5G and beyond |
| CN107276621B (en) * | 2017-06-01 | 2019-03-29 | 博流智能科技（南京）有限公司 | Take into account the receiver AGC system and method for plurality of application scenes |
| CN109756240B (en) * | 2019-01-25 | 2021-02-09 | 广州全盛威信息技术有限公司 | Wireless communication receiver with gain control device and gain control method |
| CN113267718B (en) * | 2021-07-19 | 2021-09-17 | 成都市克莱微波科技有限公司 | Power amplifier testing method and device and computer readable storage medium |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788511A (en) * | 2016-12-30 | 2017-05-31 | 北京时代民芯科技有限公司 | A kind of wideband radio receiver |
| CN112653486A (en) * | 2020-12-10 | 2021-04-13 | 北京时代民芯科技有限公司 | Broadband radio frequency transceiver capable of expanding receiving channel bandwidth |
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