CN112737618A - Temperature compensation method for radio frequency receiver - Google Patents
Temperature compensation method for radio frequency receiver Download PDFInfo
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- CN112737618A CN112737618A CN202110245090.0A CN202110245090A CN112737618A CN 112737618 A CN112737618 A CN 112737618A CN 202110245090 A CN202110245090 A CN 202110245090A CN 112737618 A CN112737618 A CN 112737618A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/14—Compensating for temperature change
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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
- H04B1/16—Circuits
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Abstract
A temperature compensation device for a radio frequency receiver comprises a clock buffer, an amplitude equalizer, a harmonic selection circuit, a radio frequency amplification circuit, an amplitude stabilizing circuit and a multi-channel selection circuit. The clock buffer is used for converting a reference source signal into a square wave signal, the amplitude equalizer is used for equalizing the amplitude value of the harmonic wave of the square wave signal, the harmonic wave selection circuit selects one path of harmonic wave signal of the square wave signal to send to the radio frequency amplification circuit and the amplitude stabilizing circuit for amplification and amplitude stabilization, and the multichannel selection circuit outputs the amplified and amplitude stabilized harmonic wave signal to one path of the multiple paths of frequency input channels of the radio frequency receiver to be used as a temperature calibration compensation signal of the radio frequency receiver in the frequency input channels. Because the radio frequency receiver receives the radio frequency signals of different frequency bands and adopts different frequency input channels and adopts different temperature calibration compensation signals for the different frequency input channels, the measurement of the radio frequency receiver is more accurate and the stability is better.
Description
The application is a divisional application with the name of 'temperature compensation device and method for radio frequency receiver, radio frequency receiver' of application number 202011542562.0, filed on 24.12.2020.
Technical Field
The invention relates to the technical field of radio frequency circuits, in particular to a temperature compensation method for a radio frequency receiver.
Background
The channel gain of the rf signal receiving channel of the conventional rf receiver varies with the temperature. If the rf receiver needs to accurately measure the power of the received rf signal, the measurement result will be inaccurate due to the channel gain variation of the rf channel. Therefore, it is necessary to perform gain detection on the rf signal receiving channel and compensate the power measured by the rf signal receiving channel according to the detected gain, so as to meet the requirement of accurate measurement of the rf receiver. In the prior art, when temperature compensation is carried out on a radio frequency signal receiving channel, the problems of large temperature compensation data processing capacity, poor long-term stability, low compensation accuracy, complex circuit, narrow compensation range and the like exist.
Disclosure of Invention
The invention mainly solves the technical problem of temperature compensation of the radio frequency receiver.
According to a first aspect, an embodiment provides a temperature compensation apparatus for a radio frequency receiver, including a clock buffer, an amplitude equalizer, a harmonic selection circuit, a radio frequency amplification circuit, an amplitude stabilizing circuit, and a multi-channel selection circuit;
the clock buffer is used for converting a reference source signal into a square wave signal and then outputting the square wave signal to the amplitude equalizer; the amplitude equalizer is used for equalizing the amplitude value of the harmonic wave of the square wave signal; the harmonic selection circuit is used for selecting one path of harmonic signal of the square wave signal and sending the harmonic signal to the radio frequency amplification circuit; the radio frequency amplifying circuit is used for amplifying the harmonic signal output by the harmonic selection circuit; the amplitude stabilizing circuit is used for stabilizing the amplitude of the amplified harmonic signals; the multichannel selection circuit is used for outputting the harmonic signal after amplitude stabilization to one frequency input channel of the radio frequency receiver so as to be used as a temperature calibration compensation signal of the radio frequency receiver in the frequency input channel; the radio frequency receiver comprises at least two frequency input channels, and each frequency input channel is used for receiving radio frequency signals of different frequency bands.
In one embodiment, the harmonic selection circuit comprises a first switch selection circuit, a second switch selection circuit and at least two filters; the first switch selection circuit comprises first connection ends and second connection ends, the number of the second connection ends is the same as that of the filters, the first connection ends of the first switch selection circuit are connected with the amplitude equalizer, and each second connection end of the first switch selection circuit is connected with one filter; the second switch selection circuit comprises first connection ends and second connection ends, the number of the second connection ends is the same as that of the filters, the first connection ends of the second switch selection circuit are connected with the radio frequency amplification circuit, and each second connection end of the second switch selection circuit is connected with one filter; the filters comprise band-pass filters, and the frequency bands of radio-frequency signals passed by the band-pass filters are different.
In an embodiment, the rf amplifying circuit includes a first rf amplifier, an input terminal of the first rf amplifier is connected to the first connection terminal of the second switch selecting circuit, and an output terminal of the first rf amplifier is connected to the amplitude stabilizing circuit.
In one embodiment, the amplitude stabilizing circuit comprises a first connection end, a second connection end, a voltage variable attenuator, a second radio frequency amplifier, a filter selection circuit and a negative feedback circuit;
the first connecting end of the amplitude stabilizing circuit is connected with the radio frequency amplifying circuit; the second connecting end of the amplitude stabilizing circuit is connected with the multi-channel selection circuit; the voltage variable attenuator comprises a harmonic signal input end, a harmonic signal output end and a control voltage input end, the harmonic signal input end of the voltage variable attenuator is connected with the first connecting end of the amplitude stabilizing circuit, the harmonic signal output end of the voltage variable attenuator is connected with the input end of the second radio frequency amplifier, the control voltage input end of the voltage variable attenuator is connected with the negative feedback circuit, and the voltage variable attenuator is used for attenuating the harmonic signal; the output end of the second radio frequency amplifier is connected with the filtering selection circuit, and the second radio frequency amplifier is used for amplifying the attenuated harmonic signals; the filtering selection circuit comprises a third switch selection circuit, a fourth switch selection circuit and at least two filters; the third switch selection circuit of the filtering selection circuit comprises a first connection end and second connection ends with the same number as the filters, the first connection end of the third switch selection circuit of the filtering selection circuit is connected with the output end of the second radio frequency amplifier, and each second connection end of the third switch selection circuit is connected with one filter; the fourth switch selection circuit of the filtering selection circuit comprises a first connection end and second connection ends, the number of the second connection ends is the same as that of the filters, and the first connection end of the fourth switch selection circuit of the filtering selection circuit is connected with the second connection end of the amplitude stabilizing circuit; each second connection of the fourth switch selection circuit is connected to one of the filters; the filters comprise band-pass filters, and the frequency bands of radio-frequency signals passed by the band-pass filters are different; the filtering selection circuit is used for filtering useless signals in the harmonic signals;
the negative feedback circuit comprises a first connecting end and a second connecting end, the first connecting end of the negative feedback circuit is connected with the second connecting end of the amplitude stabilizing circuit, the second connecting end of the negative feedback circuit is connected with the control voltage input end of the voltage variable attenuator, and the negative feedback circuit is used for extracting a harmonic calibration signal of the harmonic signal, converting the harmonic calibration signal into a direct current voltage signal and comparing the direct current voltage signal with a preset reference voltage to generate a control voltage for the voltage variable attenuator.
In one embodiment, the negative feedback circuit comprises a coupling circuit, a detector, a DAC and an operational amplifier;
the coupling circuit comprises a first connecting end and a second connecting end, the first connecting end of the coupling circuit is connected with the first connecting end of the negative feedback circuit, and the second connecting end of the coupling circuit is connected with the detector;
the detector comprises a first connecting end and a second connecting end, the first connecting end of the detector is connected with the second connecting end of the coupling circuit, and the second connecting end of the detector is connected with the operational amplifier;
the output end of the DAC is connected with the operational amplifier and is used for outputting a preset reference voltage to the operational amplifier;
the operational amplifier comprises two input ends and an output end, one input end of the operational amplifier is connected with the second connecting end of the detector, the other input end of the operational amplifier is connected with the output end of the DAC, and the output end of the operational amplifier is connected with the second connecting end of the negative feedback circuit.
In one embodiment, the multi-channel selection circuit comprises a temperature calibration signal input terminal, a receiver input terminal, a radio frequency switch circuit and a fifth switch selection circuit;
the temperature calibration signal input end of the multichannel selection circuit is connected with the second connecting end of the amplitude stabilizing circuit, and the receiver input end is used as the radio frequency signal input end of the radio frequency receiver;
the radio frequency switch circuit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end of the radio frequency switch circuit is connected with the temperature calibration signal input end of the multichannel selection circuit, the second connecting end of the radio frequency switch circuit is connected with the receiver input end of the multichannel selection circuit, the third connecting end of the radio frequency switch circuit is connected with the fifth switch selection circuit, and the radio frequency switch circuit is used for connecting the first connecting end and the third connecting end of the radio frequency switch circuit or connecting the second connecting end and the third connecting end of the radio frequency switch circuit;
the fifth switch selection circuit comprises a first connecting end and second connecting ends, the number of the second connecting ends is the same as that of the radio frequency signal receiving channels of the radio frequency receiver, the first connecting end of the fifth switch selection circuit is connected with the third connecting end of the radio frequency switch circuit, and each second connecting end of the fifth switch selection circuit is connected with one radio frequency signal receiving channel of the radio frequency receiver; the radio frequency receiver comprises at least two radio frequency signal receiving channels.
According to a second aspect, an embodiment provides a radio frequency receiver comprising the temperature compensation device of the first aspect.
According to a third aspect, an embodiment provides a temperature compensation method for a radio frequency receiver, the radio frequency receiver including at least two radio frequency signal receiving channels, each of the radio frequency signal receiving channels receiving a radio frequency signal in a different frequency range, the temperature compensation method including:
obtaining a gain compensation value of each radio frequency signal receiving channel, wherein the gain compensation value is a difference between a power measurement value and a calibration power when the radio frequency signal receiving channel receives a preset harmonic calibration signal, and the calibration power is a power value of a corresponding harmonic calibration signal measured when the radio frequency signal receiving channel is subjected to factory calibration;
measuring the temperature of each radio frequency signal receiving channel according to a preset time interval;
and when the difference between the temperature value of the radio frequency signal receiving channel obtained by current measurement and the temperature value of the radio frequency signal receiving channel measured last time is larger than a preset threshold value, executing gain calibration once, and resetting the gain compensation value of the radio frequency signal receiving channel.
In one embodiment, the resetting the gain compensation value of the rf signal receiving channel includes:
modifying the gain compensation value to a difference of the real-time power measurement and the scaled power.
The temperature compensation device according to the embodiment comprises a clock buffer, an amplitude equalizer, a harmonic selection circuit, a radio frequency amplification circuit, an amplitude stabilizing circuit and a multi-channel selection circuit. The clock buffer is used for converting a reference source signal into a square wave signal, the amplitude equalizer is used for equalizing the amplitude value of the harmonic wave of the square wave signal, the harmonic wave selection circuit selects one path of harmonic wave signal of the square wave signal to send to the radio frequency amplification circuit and the amplitude stabilizing circuit for amplification and amplitude stabilization, and the multichannel selection circuit outputs the amplified and amplitude stabilized harmonic wave signal to one path of frequency input channel of the multipath frequency input channel of the radio frequency receiver to be used as a temperature calibration compensation signal of the radio frequency receiver in the path of frequency input channel. Because the radio frequency receiver receives the radio frequency signals of different frequency bands and adopts different frequency input channels and adopts different temperature calibration compensation signals for the different frequency input channels, the measurement of the radio frequency receiver is more accurate and the stability is better.
Drawings
FIG. 1 is a schematic structural diagram of a temperature compensation device according to an embodiment;
FIG. 2 is a schematic circuit diagram of a harmonic selection circuit according to an embodiment;
FIG. 3 is a schematic diagram of a circuit structure of an embodiment of an amplitude stabilizing circuit;
FIG. 4 is a schematic diagram of a circuit configuration of a multi-channel selection circuit in one embodiment;
FIG. 5 is a schematic diagram illustrating an exemplary embodiment of an RF receiver;
fig. 6 is a flow chart illustrating a temperature compensation method for an rf receiver according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
The method for performing temperature compensation in the existing receiver mainly comprises the following steps:
the first method is to acquire the gain characteristics of the equipment at different temperatures in advance to obtain the change relation of the gain along with the temperature, acquire the temperature of the equipment by using a temperature sensor when the equipment works, inquire the corresponding gain according to the acquired temperature and then compensate the gain. By adopting the mode to carry out temperature compensation, the workload of data acquisition in the early stage is large, the device can age along with the lapse of time, the relation of gain along with the change of temperature also changes along with the change of the device, and the compensation effect can be slowly deteriorated.
In the second method, a temperature compensation device is used for compensating the influence of temperature on the gain, but the influence of the temperature on the gain can only be reduced by using the temperature compensation device, and accurate compensation cannot be realized.
And a third method is to add a temperature compensation calibration source in the equipment for gain calibration. When calibration is needed in the using process, the output of the calibration source is connected to a receiving channel of the receiver, and the measured power value is compared with the calibration value measured in the factory to obtain a compensation value. The method can solve the problem of device aging, but the output power of the temperature compensation calibration source needs to be kept unchanged in a wider temperature range, so that the circuit design becomes complicated, and only a narrower frequency range can be output usually, and all frequency points in a receiving frequency band cannot be calibrated.
The three methods have the advantages that the temperature compensation data acquisition workload is large, the compensation effect becomes poor along with the time, the compensation is inaccurate, the circuit design is complex, the cost is high, even if a single-frequency point signal is adopted by a temperature compensation calibration source, the temperature compensation calibration source can only be used for the calibration compensation of one frequency point, and the calibration of a plurality of different frequency channels cannot be realized.
In the embodiment of the invention, the radio frequency receiver receives the radio frequency signals of different frequency bands and adopts different frequency input channels, and different temperature calibration compensation signals are adopted for the different frequency input channels, so that the measurement of the radio frequency receiver is more accurate and the stability is better.
The first embodiment is as follows:
referring to fig. 1, a schematic diagram of a temperature compensation apparatus in an embodiment is shown, the temperature compensation apparatus includes a clock buffer 20, an amplitude equalizer 21, a harmonic selection circuit 22, a radio frequency amplification circuit 23, an amplitude stabilizing circuit 24, and a multi-channel selection circuit 25. The clock buffer 20 is configured to convert a reference source signal into a square wave signal and output the square wave signal to the amplitude equalizer 21, the amplitude equalizer 21 is configured to equalize an amplitude value of a harmonic of the square wave signal, the harmonic selection circuit 22 is configured to select one path of a harmonic signal of the square wave signal and send the harmonic signal to the radio frequency amplification circuit, the radio frequency amplification circuit 23 is configured to amplify the harmonic signal output by the harmonic selection circuit 22, the amplitude stabilizing circuit 24 is configured to stabilize the amplitude of the amplified harmonic signal, and the multi-channel selection circuit 25 is configured to output the amplitude-stabilized harmonic signal to one path of frequency input channels of the radio frequency receiver 3, so as to be used as a temperature calibration compensation signal of the radio frequency receiver 3 in the path of frequency input channels. The rf receiver 3 includes at least two frequency input channels, and each frequency input channel is configured to receive rf signals of different frequency bands. In one embodiment, the reference source signal is emitted by a reference source 1. In one embodiment, the reference source 1 is a reference source 1 of a radio frequency receiver 3.
Referring to fig. 2, a schematic circuit diagram of a harmonic selection circuit in an embodiment is shown, and the harmonic selection circuit 22 includes a first switch selection circuit 223, a second switch selection circuit 224, and at least two filters 222. The first switch selection circuit 223 includes first connection terminals and second connection terminals in the same number as the filters 222, the first connection terminals of the first switch selection circuit 223 are connected to the amplitude equalizer 21, and each of the second connection terminals of the first switch selection circuit 223 is connected to one of the filters 222. The second switch selection circuit 224 includes first connection terminals and second connection terminals having the same number as the filters 222, the first connection terminals of the second switch selection circuit 224 are connected to the rf amplification circuit 23, each second connection terminal of the second switch selection circuit 224 is connected to one filter 222, and the filters 222 include band pass filters, and frequency bands of the rf signals passed by each band pass filter are different. In one embodiment, the rf amplifying circuit 23 includes a first rf amplifier 231, an input terminal of the first rf amplifier 231 is connected to the first connection terminal of the second switch selection circuit 224, and an output terminal of the first rf amplifier 231 is connected to the amplitude stabilizing circuit 24.
Referring to fig. 3, which is a schematic diagram of a circuit structure of an embodiment of an amplitude stabilizing circuit, the amplitude stabilizing circuit 24 includes a first connection terminal, a second connection terminal, a voltage variable attenuator 240, a second rf amplifier 241, a filter selection circuit 242, and a negative feedback circuit 243. The first connection end of the amplitude stabilizing circuit 24 is connected with the radio frequency amplification circuit 23, the second connection end of the amplitude stabilizing circuit 24 is connected with the multi-channel selection circuit 25, the voltage variable attenuator 240 comprises a harmonic signal input end, a harmonic signal output end and a control voltage input end, the harmonic signal input end of the voltage variable attenuator 240 is connected with the first connection end of the amplitude stabilizing circuit 24, the harmonic signal output end of the voltage variable attenuator 240 is connected with the input end of the second radio frequency amplifier 241, the control voltage input end of the voltage variable attenuator 240 is connected with the negative feedback circuit 243, and the voltage variable attenuator 240 is used for attenuating harmonic signals. The output end of the second rf amplifier 241 is connected to the filter selection circuit 242, and the second rf amplifier 241 is used for amplifying the attenuated harmonic signal. The filter selection circuit 242 includes a third switch selection circuit 2421, a fourth switch selection circuit 2422, and at least two filters 2423. The third switch selection circuit of the filter selection circuit 2421 includes a first connection terminal and second connection terminals with the same number as the filters 2423 of the filter selection circuit 242, the first connection terminal of the third switch selection circuit 2421 of the filter selection circuit 242 is connected with the output terminal of the second radio frequency amplifier 241, each second connection terminal of the third switch selection circuit 2421 is connected with one filter 2423, the fourth switch selection circuit 2422 of the filter selection circuit 242 includes a first connection terminal and second connection terminals with the same number as the filters 2423, the first connection terminal of the fourth switch selection circuit 2422 of the filter selection circuit 242 is connected with the second connection terminal of the amplitude stabilizing circuit 24, each second connection terminal of the fourth switch selection circuit 2422 is connected with one filter 2423, the filters 2423 include band pass filters, the frequency bands of the radio frequency signals passed by each band pass filter are different, and the filter selection circuit 242 is used for filtering the unwanted signals in the harmonic signals. The negative feedback circuit 243 includes a first connection end and a second connection end, the first connection end of the negative feedback circuit 243 is connected with the second connection end of the amplitude stabilizing circuit 24, the second connection end of the negative feedback circuit 243 is connected with the control voltage input end of the voltage variable attenuator 240, and the negative feedback circuit 243 is used for extracting a harmonic calibration signal of the harmonic signal, converting the harmonic calibration signal into a direct current voltage signal, and comparing the direct current voltage signal with a preset reference voltage to generate a control voltage for the voltage variable attenuator 240. The negative feedback circuit 243 includes a coupling circuit 2431, a detector 2432, a DAC2433, and an operational amplifier 2434. The coupling circuit 2431 includes a first connection terminal and a second connection terminal, the first connection terminal of the coupling circuit 2431 is connected to the first connection terminal of the negative feedback circuit 243, and the second connection terminal of the coupling circuit 2431 is connected to the wave detector 2432. The detector 2432 includes a first connection terminal and a second connection terminal, the first connection terminal of the detector 2432 is connected to the second connection terminal of the coupling circuit 2431, and the second connection terminal of the detector 2432 is connected to the operational amplifier 2434. The output terminal of the DAC2433 is connected to the operational amplifier 2434, and is used for outputting a predetermined reference voltage to the operational amplifier 2434. The operational amplifier 2434 includes two input terminals and an output terminal, one input terminal of the operational amplifier 2434 is connected to the second connection terminal of the detector 2432, the other input terminal is connected to the output terminal of the DAC2433, and the output terminal of the operational amplifier 2434 is connected to the second connection terminal of the negative feedback circuit 243. In one embodiment, the coupling circuit 2431 includes a coupling resistor.
Referring to fig. 4, which is a schematic diagram of a circuit structure of a multi-channel selection circuit according to an embodiment, the multi-channel selection circuit 25 includes a temperature calibration signal input terminal, a receiver input terminal, an rf switch circuit 251, and a fifth switch selection circuit 252. The temperature calibration signal input terminal of the multi-channel selection circuit 25 is connected to the second connection terminal of the amplitude stabilizing circuit 24, and the receiver input terminal is used as the radio frequency signal input terminal 250 of the radio frequency receiver. The radio frequency switch circuit 251 comprises a first connection end, a second connection end and a third connection end, the first connection end of the radio frequency switch circuit 251 is connected with the temperature calibration signal input end of the multichannel selection circuit 25, the second connection end of the radio frequency switch circuit 251 is connected with the receiver input end of the multichannel selection circuit 25, the third connection end of the radio frequency switch circuit 251 is connected with the fifth switch selection circuit 252, and the radio frequency switch circuit 251 is used for connecting the first connection end and the third connection end of the radio frequency switch circuit 251 or connecting the second connection end and the third connection end of the radio frequency switch circuit 251. The fifth switch selection circuit 252 includes a first connection end and second connection ends, the number of which is the same as that of the radio frequency signal receiving channels of the radio frequency receiver 3, the first connection end of the fifth switch selection circuit 252 is connected with the third connection end of the radio frequency switch circuit 251, each second connection end of the fifth switch selection circuit 252 is connected with one radio frequency signal receiving channel of the radio frequency receiver 3, and the radio frequency receiver 3 includes at least two radio frequency signal receiving channels. The rf receiver 3 is configured to perform signal post-processing, such as filtering, amplifying, frequency converting, and sampling, on the rf signal input by the frequency input channel.
In one embodiment, the present application further discloses a radio frequency receiver including the temperature compensation device as described above. The radio frequency receiver is a broadband receiver and can work on different carrier frequencies, as the frequency range of received radio frequency signals is very wide, radio frequency receiving channels need to be divided, and different frequency bands use different frequency input channels, so that signal processing such as filtering, frequency conversion and amplification can be conveniently carried out, and the radio frequency receiver can achieve better performance. In one embodiment, the rf receiver has 4 channels, and the actual number of channels may be greater than 4 or less than 4. Since different frequency input channels operate in different frequency bands, the temperature compensation device also needs to be able to generate temperature calibration signals within the frequency band range of the corresponding channel for temperature compensation of the different frequency input channels. The temperature compensation device utilizes a reference source and a clock buffer which are arranged in the radio frequency receiver to generate a square wave with fundamental frequency as the frequency of a reference signal, the square wave contains abundant harmonic waves, the frequency range of each frequency input channel of the radio frequency receiver can have the harmonic waves falling into, and the frequency input channel can be calibrated only by taking one harmonic signal from each frequency input channel. The square wave is passed through an amplitude equalizer so that the amplitudes of the harmonics used for temperature calibration compensation do not differ too much. And then selecting the harmonic calibration signal of the corresponding channel through a harmonic selection circuit. The selected harmonic calibration signal is subjected to two-stage amplification and one-stage attenuation, the amplitude of the harmonic calibration signal is adjusted, other useless harmonic signals are filtered by the filtering wave selection circuit, and finally the harmonic calibration signal is output to the radio frequency receiver through the frequency input channel. A voltage variable attenuator and a second radio frequency amplifier in the amplitude stabilizing circuit are used for amplitude adjustment, and a filtering selection circuit is used for filtering useless signals. The coupling resistor, the detector, the DAC and the operational amplifier jointly form a negative feedback circuit. The coupling resistor is used for extracting a harmonic calibration signal, the extracted signal is converted into a direct-current voltage signal after passing through the detector, the direct-current voltage signal is compared with a reference voltage generated by the DAC in the operational amplifier, a control voltage is generated and is supplied to the voltage variable attenuator, and the attenuation amount is adjusted. When the power output by the temperature compensation device is larger than a preset value, the amplitude of the signal extracted by the coupling resistor is larger, the direct-current voltage output by the detector is larger than the voltage reference output by the DAC, the output control voltage of the operational amplifier is increased, and the attenuation of the voltage variable attenuator is increased to reduce the output power. Similarly, when the output power of the calibration signal generating device is smaller than the preset value, the output control voltage of the operational amplifier is reduced, so that the attenuation amount of the voltage variable attenuator is reduced to increase the output power. Through negative feedback regulation, the output power of the calibration signal generation device is finally equal to the preset value. The preset value can be adjusted through the voltage reference output by the DAC, and when the voltage reference output by the DAC is reduced, the preset value is reduced. The voltage reference output by the DAC is not changed, the preset value is not changed, so the stability of the power output by the calibration signal generating device is determined by the voltage reference output by the DAC, a DAC with small temperature drift can be selected, the change of the output voltage along with the temperature is small, the change of the power output by the calibration signal generating device along with the temperature can be considered to be not changed along with the temperature, and the calibration signal can be used as a temperature calibration compensation signal.
Referring to fig. 5, a schematic diagram of a working flow of an rf receiver according to an embodiment includes:
And step 200, entering a temperature calibration mode.
The radio frequency switch circuit is connected with the multi-channel selection circuit and the frequency receiving channel of the radio frequency receiver.
And step 300, sequentially switching to each frequency receiving channel, and simultaneously outputting a temperature calibration compensation signal of the corresponding channel by the temperature compensation device.
The fifth switch selection circuit switches the frequency receiving channel of the radio frequency receiver in sequence, namely switches the connection channel 1, the channel 2, the channel … and the channel n. When any frequency receiving channel is connected, the temperature compensation device outputs the temperature calibration compensation signal of the corresponding channel, for example, if the fifth switch selection circuit is connected with the channel 1, the harmonic selection circuit selects the connected filter 1, and the filter selection circuit selects the connected filter 1, so that the temperature compensation device outputs the temperature calibration compensation signal of the corresponding channel 1.
And step 400, recording the power value obtained by measuring each channel and the temperature of the receiver during calibration, and subtracting the calibration power from the power value to obtain a gain compensation value.
And respectively acquiring power values of each frequency receiving channel of the radio frequency receiver when receiving the respective temperature compensation signal, wherein the power values are used for acquiring gain compensation values of the respective frequency receiving channels.
And repeating the second step when the difference value between the monitored current equipment temperature and the temperature during the last temperature calibration is larger than the preset threshold value.
And when the difference value between the monitored current equipment temperature and the temperature during the last temperature calibration is smaller than a preset threshold value, the radio frequency receiver continues to work.
The radio frequency receiver of the embodiment of the application can realize the temperature compensation of a plurality of different frequency band frequency receiving channels, in addition, the negative feedback circuit increases the amplitude stability of the temperature compensation calibration signal, and the problem of poor compensation effect caused by aging of devices is solved during real-time temperature compensation. In particular, the hardware cost of the temperature compensation device is reduced by utilizing the existing reference source and clock buffer of the radio frequency receiver.
In the embodiment of the application, the temperature compensation device comprises a clock buffer, an amplitude equalizer, a harmonic selection circuit, a radio frequency amplification circuit, an amplitude stabilizing circuit and a multi-channel selection circuit. The clock buffer is used for converting a reference source signal into a square wave signal, the amplitude equalizer is used for equalizing the amplitude value of the harmonic wave of the square wave signal, the harmonic wave selection circuit selects one path of harmonic wave signal of the square wave signal to send to the radio frequency amplification circuit and the amplitude stabilizing circuit for amplification and amplitude stabilization, and the multichannel selection circuit outputs the amplified and amplitude stabilized harmonic wave signal to one path of the multiple paths of frequency input channels of the radio frequency receiver to be used as a temperature calibration compensation signal of the radio frequency receiver in the frequency input channels. Because the radio frequency receiver receives the radio frequency signals of different frequency bands and adopts different frequency input channels and adopts different temperature calibration compensation signals for the different frequency input channels, the measurement of the radio frequency receiver is more accurate and the stability is better.
Example two:
referring to fig. 6, a flow chart of an embodiment of a temperature compensation method for an rf receiver is shown, the rf receiver includes at least two rf signal receiving channels, and frequency ranges of rf signals received by the rf signal receiving channels are different, the temperature compensation method includes:
And acquiring a gain compensation value of each radio frequency signal receiving channel, wherein the gain compensation value is the difference between a power measurement value and a calibration power when the radio frequency signal receiving channel receives a preset harmonic calibration signal, and the calibration power is the power value of the corresponding harmonic calibration signal measured by the radio frequency signal receiving channel during factory calibration.
The temperature of each RF signal receiving channel is measured at a predetermined time interval.
In step 230, the gain compensation value is reset.
And when the difference between the temperature value of the radio frequency signal receiving channel obtained by current measurement and the temperature value of the radio frequency signal receiving channel measured last time is greater than a preset threshold value, executing gain calibration once, wherein the process of executing gain calibration is a process of acquiring a gain compensation value of the receiving channel and is used for resetting the gain compensation value of the radio frequency signal receiving channel. Wherein resetting the gain compensation value of the RF signal receiving channel is changing the gain compensation value to the difference between the real-time power measurement value and the scaled power.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a processor, all or part of the functions in the above embodiments may be implemented.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (4)
1. A temperature compensation method for a radio frequency receiver, wherein the radio frequency receiver includes at least two radio frequency signal receiving channels, and a frequency range of a radio frequency signal received by each of the radio frequency signal receiving channels is different, the temperature compensation method comprising:
obtaining a gain compensation value of each radio frequency signal receiving channel, wherein the gain compensation value is a difference between a power measurement value and a calibration power when the radio frequency signal receiving channel receives a preset harmonic calibration signal, and the calibration power is a power value of a corresponding harmonic calibration signal measured when the radio frequency signal receiving channel is subjected to factory calibration;
measuring the temperature of each radio frequency signal receiving channel according to a preset time interval;
and when the difference between the temperature value of the radio frequency signal receiving channel obtained by the current measurement and the temperature value of the radio frequency signal receiving channel measured last time is larger than a preset threshold value, the gain compensation value of each radio frequency signal receiving channel is obtained again.
2. The method of temperature compensation according to claim 1, wherein said re-obtaining the gain compensation value for each of said rf signal receiving channels comprises:
modifying the gain compensation value to a difference of the real-time power measurement and the scaled power.
3. The method of claim 2, wherein said measuring the temperature of each of said rf signal receiving channels at a predetermined time interval comprises:
sequentially switching the radio frequency receiving channels of the radio frequency receiver;
and respectively acquiring a power value when each frequency receiving channel of the radio frequency receiver receives the respective temperature compensation signal, wherein the power value is used as a power measurement value of the frequency receiving channel and is used for acquiring a gain compensation value of the respective frequency receiving channel.
4. A computer-readable storage medium, characterized in that the medium has stored thereon a program executable by a processor to implement the temperature compensation method according to any one of claims 1 or 2.
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| CN116879855A (en) * | 2023-09-05 | 2023-10-13 | 成都梓峡信息技术有限公司 | Radar electronic countermeasure signal processing system and method |
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| CN114629457B (en) * | 2021-12-30 | 2024-10-11 | 北京无线电计量测试研究所 | Device and method for controlling frequency source and frequency source |
| CN114895102B (en) * | 2022-02-25 | 2023-05-09 | 电子科技大学 | High-isolation input/output stage large dynamic range power detection circuit |
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| CN112737618B (en) | 2022-04-12 |
| CN112272036B (en) | 2021-03-23 |
| CN112272036A (en) | 2021-01-26 |
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