JP4378246B2 - Ripple characteristic correction circuit and ripple characteristic correction method - Google Patents

Description

  The present invention relates to a ripple characteristic correction circuit and a ripple characteristic correction method.

It has been conventionally known that a ripple in the baseband band (a signal amplitude varies depending on a signal frequency) exists when a spread spectrum modulation signal for communication passes through a circuit. Conventionally, ripple is considered to be one of the indicators of circuit performance, so in order to obtain a circuit with little influence of ripple, a trimmer capacitor for correcting the ripple component in advance is provided at the circuit input stage. When the product including the circuit is installed and shipped, the ripple of the circuit is measured to adjust the capacitance of the trimmer capacitor to minimize the product ripple. This principle is described in detail in Non-Patent Document 1, for example.
Koichi Shimoda, Shinkai Sakurai, “Basics of Electronics (New Edition)”, Physics Selection 1, Kasuga Sobo, March 25, 1987, P.A. 254-255

  However, recently, high accuracy is often required for the amplitude component of the baseband signal of a circuit. For example, when quadrature amplitude modulation is performed in a communication device, extremely accurate amplitude control is required to identify communication signals multiplexed by amplitude. In this way, even if settings are made so that ripples are kept to a minimum at the time of shipment by the conventional method described above, the effects of slight changes in ripples due to the external environment such as temperature and humidity have been considered so far. Increasingly, such a slight change in ripple cannot be ignored.

  The present invention has been made in view of the above problems, and an object of the present invention is to enable ripples in a circuit to be further reduced by making it possible to measure circuit ripples at any time. A characteristic correction circuit and a ripple characteristic correction method are provided.

  A ripple characteristic correction circuit according to the present invention for solving the above-described problems is a ripple that measures a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including a first circuit and a second circuit. In the characteristic correction circuit, first ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the first circuit, and the ripple output from the first circuit. A frequency conversion unit that converts the frequency of the ripple measurement signal so that the measurement signal becomes the reference frequency, and a second that inputs the ripple measurement signal that is frequency-converted by the frequency conversion unit to the second circuit. Ripple measurement signal input means; amplitude measurement means for measuring the amplitude of the ripple measurement signal output from the second circuit; Based on an amplitude of each of the frequency difference measured by serial amplitude measuring means, characterized in that it comprises a ripple calculating means for calculating a feature quantity of the ripple of the first circuit.

  By doing so, the ripple can be detected without using a special measuring device, and the ripple of the first circuit can be corrected at any time using the detection result. It becomes possible to further reduce the influence of.

  In the ripple characteristic correction circuit, amplitude changing means for changing the amplitude of the signal input to the first circuit so as to cancel the ripple of the first circuit indicated by the ripple characteristic amount calculated by the ripple calculating means. , May be further included.

  According to another aspect of the present invention, there is provided a ripple characteristic correction circuit that measures a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including a first circuit and a second circuit. In the correction circuit, first ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals having a reference frequency to the first circuit, and the ripple measurement signal output from the first circuit are A frequency conversion means for converting the frequency of the ripple measurement signal so as to have a frequency difference different from a reference frequency, and a second circuit for inputting the ripple measurement signal frequency-converted by the frequency conversion means to the second circuit. Ripple measurement signal input means, amplitude measurement means for measuring the amplitude of the ripple measurement signal output from the second circuit, and the amplitude Based on an amplitude of each of the frequency difference measured by the constant unit, characterized in that it comprises a ripple calculating means for calculating a feature quantity of the ripple of the second circuit.

  By doing so, it is possible to detect ripples without using a special measuring device, so that the ripples in the second circuit can be corrected at any time using the detection results. It becomes possible to further reduce the influence of.

  Further, in the ripple characteristic correction circuit, amplitude changing means for changing the amplitude of the signal output from the second circuit so as to cancel the ripple of the second circuit indicated by the ripple characteristic amount calculated by the ripple calculating means. , May be further included.

  According to another aspect of the present invention, there is provided a communication apparatus including a transmission circuit and a reception circuit, wherein the transmission circuit converts at least one stage of frequency for converting a transmission signal into a transmission frequency. A first ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the transmission circuit, and the ripple conversion signal is generated by the frequency conversion means. Ripple measurement signal frequency conversion means for converting the frequency of the ripple measurement signal so as to be the reference frequency, and a second ripple measurement signal for inputting the ripple measurement signal output from the transmission circuit to the reception circuit. A signal input unit, an amplitude measurement unit that measures the amplitude of the ripple measurement signal output from the reception circuit, and the amplitude measurement unit. Ripple calculating means for calculating a feature amount of a ripple indicating a change in the amplitude of the output signal due to a change in the frequency of the input signal in the transmission circuit based on the measured amplitude for each frequency difference. . In this way, it is possible to calculate the ripple feature value of the transmission circuit of the communication device, and to calculate the ripple feature value without using a special measuring device even after the communication device is put into operation. As a result, the influence of ripple can be further reduced. It is preferable that the ripple measurement signal frequency conversion means converts the frequency of the ripple measurement signal by a final-stage frequency conversion means among the plurality of frequency conversion means. Further, it may further include amplitude changing means for changing the amplitude of the signal input to the transmission circuit so as to cancel the ripple of the transmission circuit indicated by the ripple feature amount calculated by the ripple calculation means.

  According to another aspect of the present invention, there is provided a communication apparatus including a transmission circuit and a reception circuit, wherein the transmission circuit converts at least one stage of frequency for converting a transmission signal into a transmission frequency. First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals having a reference frequency to the transmission circuit, and the ripple conversion signal is converted to the reference frequency by the frequency conversion means. Ripple measurement signal frequency converting means for converting the frequency of the ripple measurement signal so as to have different frequency differences, and second ripple measurement for inputting the ripple measurement signal output from the transmission circuit to the reception circuit. Signal input means, amplitude measurement means for measuring the amplitude of the ripple measurement signal output from the receiving circuit, and amplitude measurement means Ripple calculating means for calculating a feature quantity of a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in the receiving circuit based on an amplitude measured for each frequency difference . In this way, it is possible to calculate the ripple feature value of the receiving circuit of the communication device, and to calculate the ripple feature value without using a special measurement device even after the communication device is put into operation. As a result, the influence of ripple can be further reduced. It is preferable that the ripple measurement signal frequency conversion means converts the frequency of the ripple measurement signal by a final-stage frequency conversion means among the plurality of frequency conversion means. Further, it may further include amplitude changing means for changing the amplitude of the signal output from the receiving circuit so as to cancel the ripple of the receiving circuit indicated by the ripple feature amount calculated by the ripple calculating means.

  According to another aspect of the present invention, there is provided a communication device including a transmission circuit and a reception circuit, wherein the reception circuit converts at least one frequency for converting a received signal into an intermediate frequency. First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the transmission circuit, and the ripple measurement signal output from the transmission circuit. A ripple measurement signal for converting the frequency of the ripple measurement signal so that the ripple measurement signal becomes the reference frequency by the second ripple measurement signal input means and the frequency conversion means. A frequency conversion unit, an amplitude measurement unit that measures the amplitude of the ripple measurement signal output from the reception circuit, and the amplitude measurement unit. Ripple calculating means for calculating a feature amount of a ripple indicating a change in the amplitude of the output signal due to a change in the frequency of the input signal in the transmission circuit based on the measured amplitude for each frequency difference. . Even in this way, it is possible to calculate the ripple feature value of the transmission circuit of the communication device, and to calculate the ripple feature value without using a special measurement device even after the communication device is put into operation. As a result, the influence of ripple can be further reduced. It is preferable that the ripple measurement signal frequency conversion means converts the frequency of the ripple measurement signal by a first-stage frequency conversion means among the plurality of frequency conversion means. Further, it may further include amplitude changing means for changing the amplitude of the signal input to the transmission circuit so as to cancel the ripple of the transmission circuit indicated by the ripple feature amount calculated by the ripple calculation means.

  According to another aspect of the present invention, there is provided a communication device including a transmission circuit and a reception circuit, wherein the reception circuit converts at least one frequency for converting a received signal into an intermediate frequency. A first ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals having a reference frequency to the transmission circuit, and the ripple measurement signal output from the transmission circuit as the reception circuit. The second ripple measurement signal input means for inputting to the signal and the frequency conversion means for converting the frequency of the ripple measurement signal so that the ripple measurement signal has a different frequency difference from the reference frequency. A signal frequency converting means, an amplitude measuring means for measuring the amplitude of the ripple measuring signal output from the receiving circuit, and the amplitude measuring means Ripple calculating means for calculating a feature quantity of a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in the receiving circuit based on an amplitude measured for each frequency difference . Even in this way, it is possible to calculate the ripple feature value of the receiving circuit of the communication device, and to calculate the ripple feature value without using a special measuring device even after the communication device is put into operation. As a result, the influence of ripple can be further reduced. It is preferable that the ripple measurement signal frequency conversion means converts the frequency of the ripple measurement signal by a first-stage frequency conversion means among the plurality of frequency conversion means. Further, it may further include amplitude changing means for changing the amplitude of the signal output from the receiving circuit so as to cancel the ripple of the receiving circuit indicated by the ripple feature amount calculated by the ripple calculating means.

  The ripple characteristic correction method according to the present invention is a ripple characteristic correction method for measuring a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including a first circuit and a second circuit. A first ripple measurement signal input step for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the first circuit, and the ripple measurement signal output from the first circuit is the reference circuit A frequency conversion step for converting the frequency of the ripple measurement signal so as to obtain a frequency, and a second ripple measurement signal input step for inputting the ripple measurement signal frequency-converted in the frequency conversion step to the second circuit. And an amplitude measurement step for measuring the amplitude of the ripple measurement signal output from the second circuit; Serial based on the amplitude of each of the frequency difference is measured in the amplitude measurement step, characterized in that it comprises a ripple calculating step of calculating a feature value of the ripple of the first circuit. The method may further include an amplitude changing step of changing the amplitude of the signal input to the first circuit so as to cancel the ripple of the first circuit indicated by the ripple feature amount calculated in the ripple calculating step. .

  According to another aspect of the present invention, there is provided a ripple characteristic correction method for measuring a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including a first circuit and a second circuit. In the correction method, first ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals having a reference frequency to the first circuit, and the ripple measurement signal output from the first circuit are A frequency conversion step for converting the frequency of the ripple measurement signal so as to have a frequency difference different from the reference frequency, and a second signal for inputting the ripple measurement signal that is frequency-converted in the frequency conversion step to the second circuit. A ripple measurement signal input step and an amplitude measurement step for measuring the amplitude of the ripple measurement signal output from the second circuit. And flop, based on an amplitude of each of the frequency difference is measured in the amplitude measurement step, characterized in that it comprises a ripple calculating step of calculating a feature value of the ripple of the second circuit. The method may further include an amplitude changing step of changing the amplitude of the signal output from the second circuit so as to cancel the ripple of the second circuit indicated by the ripple feature amount calculated in the ripple calculating step. .

  Embodiments of the present invention will be described with reference to the drawings.

  As illustrated in FIG. 1, the ripple characteristic correction circuit 10 according to the present exemplary embodiment includes a first circuit 12, a second circuit 14, a frequency conversion circuit 16, and a control circuit 18. The signal from the control circuit 18 is output to the first circuit 12 and the frequency conversion circuit 16, the signal from the first circuit 12 is output to the frequency conversion circuit 16, and the signal from the frequency conversion circuit 16 is output to the second circuit 14. The signal from the second circuit 14 is output to the control circuit 18.

  The ripple in the baseband band means that the amplitude of the signal is slightly different depending on the frequency of the baseband signal. In other words, outputs when a plurality of signals input with the same amplitude and different frequencies pass through the circuit are output with different amplitudes. The amplitude deviation amount in this case is referred to as a ripple. The ripple is generally represented by a difference from an amplitude at a certain reference frequency. In the present embodiment, the ripple is generated in the first circuit 12 or the second circuit 14. That is, the first circuit 12 and the second circuit 14 include circuit elements that easily generate ripples. The ripple characteristic correction circuit 10 measures a ripple generated in the first circuit 12 or the second circuit 14.

  Hereinafter, the operation of the ripple characteristic correction circuit 10 will be described.

  First, the first embodiment will be described. The control circuit 18 inputs a ripple measurement signal having a reference frequency serving as a reference and a predetermined frequency difference (including zero frequency difference) to the first circuit 12. The ripple measurement signal is preferably a traveling wave having a constant frequency and amplitude. The traveling wave is usually composed of electromagnetic waves (including light), but the same applies to, for example, sound waves and other vibration waves.

  The input ripple measurement signal is output from the first circuit 12 to the frequency conversion circuit 16. The frequency conversion circuit 16 converts the frequency of the ripple measurement signal so that the frequency of the ripple measurement signal becomes the reference frequency. That is, receiving the data indicating the frequency difference between the frequency of the ripple measurement signal and the reference frequency from the control circuit 18, the frequency of the ripple measurement signal is converted so as to cancel the frequency difference. Then, the frequency conversion circuit 16 outputs the ripple measurement signal to the second circuit 14.

  The second circuit 14 outputs the input signal for ripple measurement to the control circuit 18. For the ripple measurement signal thus obtained, the control circuit 18 measures the amplitude of the signal.

  The ripple characteristic correction circuit 10 sequentially performs the above processing on a plurality of ripple measurement signals, and calculates the relationship between the frequency and the amplitude of the ripple measurement signal obtained as a result as the ripple of the first circuit 12. That is, the difference in amplitude from the amplitude at the reference frequency for each frequency difference from the reference frequency is acquired as a ripple.

  Next, a second embodiment will be described. The control circuit 18 sequentially inputs a reference frequency ripple measurement signal to the plurality of first circuits 12. This ripple measurement signal is also preferably a traveling wave having a constant frequency and amplitude. The traveling wave is usually composed of electromagnetic waves (including light), but the same applies to, for example, sound waves and other vibration waves.

  The input ripple measurement signal is output from the first circuit 12 to the frequency conversion circuit 16. In the frequency conversion circuit 16, the frequency of the ripple measurement signal is converted so that the frequency of the ripple measurement signal has a predetermined frequency difference (including zero frequency difference) from the reference frequency. In other words, the control circuit 18 receives data indicating a frequency difference between the frequency of the ripple measurement signal and the reference frequency, and converts the frequency of the ripple measurement signal so as to have the frequency difference. Then, the frequency conversion circuit 16 outputs the ripple measurement signal to the second circuit 14.

  The second circuit 14 outputs the input signal for ripple measurement to the control circuit 18. For the ripple measurement signal thus obtained, the control circuit 18 measures the amplitude of the signal.

  The ripple characteristic correction circuit 10 sequentially performs the above processing on a plurality of ripple measurement signals, and calculates the relationship between the frequency and the amplitude of the ripple measurement signal obtained as a result as the ripple of the second circuit 14. That is, the difference in amplitude from the amplitude at the reference frequency for each frequency difference from the reference frequency is acquired as a ripple.

  As described above, the ripple characteristic correction circuit 10 can detect the ripple of any circuit by measuring the input of the first circuit 12 and the output of the second circuit 14. That is, since the frequency is converted when outputting the ripple measurement signal from the first circuit 12 to the second circuit 14, the ripple in the circuit through which the ripple measurement signal having no frequency difference from the reference frequency passes is Since it becomes constant regardless of the frequency difference, the control circuit 18 can measure the ripple of only the circuit having the frequency difference from the reference frequency. A signal that passes through these circuits by making an amplitude difference in advance between the signal input to the first circuit 12 or the signal output from the second circuit 14 so as to cancel the ripple obtained as described above. For example, it is possible to further reduce the influence of the ripple that the communication signal receives on the circuit.

  Next, an embodiment when the above ripple measurement process is applied to a communication apparatus will be described.

  As illustrated in FIG. 2, the communication device 20 according to the present embodiment is a wireless communication device including a control unit 22, a storage unit 24, a transmission unit 26, a switching unit 28, an antenna 30, and a reception unit 32. The transmission unit 26 includes a frequency conversion unit 34, and the reception unit 32 includes a frequency conversion unit 36. Specifically, it may be a base station device or mobile station device used in mobile communication such as a mobile phone or a wireless LAN, or may be a wireless device used in amateur radio or the like. It can also be used in fixed wireless communication such as FWA (Fixed Wireless Access).

  The control unit 22 controls each unit of the communication device 20 and executes processing related to signal transmission / reception control and communication and data communication. The storage unit 24 operates as a work memory for the control unit 22. The storage unit 24 holds programs and parameters related to various processes performed by the control unit 22. Further, a program according to the present invention is also stored. The transmission unit 26 includes at least one frequency conversion unit 34. Then, encoding / modulation processing and amplification processing for transmitting the transmission signal input from the control unit 22 are performed, and frequency conversion processing in the superheterodyne method is performed in the frequency conversion unit 34 to switch the transmission signal. 28 for output. And the switching part 28 outputs the transmission signal output from the transmission part 26 via the antenna 30 to a radio area at the time of transmission. The time of transmission refers to a transmission time slot when, for example, a time division duplex method is adopted.

  When a signal arriving at the antenna 30 is received, that is, in a reception time slot, the switching unit 28 outputs the received reception signal to the reception unit 32. The reception unit 32 includes at least one frequency conversion unit 36. Then, in addition to demodulation / decoding processing and amplification processing for receiving the reception signal input from the switching unit 28, the frequency conversion unit 36 performs frequency conversion processing in the superheterodyne method, and sends the reception signal to the control unit 22. Output.

  FIG. 3 is a hardware configuration diagram for explaining an example of the above configuration of the communication device 20 in more detail. As shown in the figure, the communication device 20 includes a transmission baseband control unit 40 and a reception baseband control unit 82, which are included in the control unit 22. The transmission baseband control unit 40 and the reception baseband control unit 82 are connected to the storage unit 24 and to each other.

  The transmission baseband control unit 40 is connected to the transmission unit 26 via a D / A converter 44 included in the control unit 22. The D / A converter 44 inputs an analog signal to the transmission unit 26 in accordance with an instruction from the transmission baseband control unit 40. The analog signal is input to an amplifier 46 included in the transmission unit 26, and further, a primary IF-BPF 48, a multiplier 50, an amplifier 52, a secondary IF-BPF 54, a multiplier 56, an RF-BPF 58, and an amplifier 60 are provided. The transmission signals are processed in order. D is an abbreviation for digital, A is an analog, BPF is a band pass filter, IF is an intermediate frequency, and RF is a radio frequency. The amplifier 60 is connected to the switching unit 28 and outputs a transmission signal to the switching unit 28. Here, DUP (duplexer) is used as the switching unit 28. However, for example, when the communication device 20 is simplex, SW (switch, SWitch) may be used.

  The receiving unit 32 is connected to the switching unit 28 by an amplifier 64 and receives a radio signal received by the antenna 30 from the switching unit 28. Further, the RF-BPF 66, the multiplier 68, the amplifier 70, the primary IF-BPF 72, the multiplier 74, the amplifier 76, and the secondary IF-BPF 78 are connected in this order, and the received signal is processed. Then, the received signal is input to the A / D converter 80 included in the control unit 22, and the received signal is digitized. Information indicating the reception signal is output to the reception baseband control unit 82.

  The communication device 20 employs a conventionally known double superheterodyne method, and the transmission unit 26 and the reception unit 32 transmit and receive signals while converting the communication signal into a two-stage intermediate frequency. Note that the transmission unit 26 finally converts the frequency of the communication signal to a radio frequency as a transmission frequency in order to transmit the communication signal to the radio section. The frequency conversion processing is performed by the multiplier 50, the multiplier 56, the multiplier 68, and the multiplier 74, and the frequency conversion is performed by multiplying signals from the local oscillator 90, the local oscillator 92, and the local oscillator 94. Is called. As for the local oscillator 92 and the local oscillator 94, a fractional N (fractional frequency division) synthesizer capable of precisely converting the frequency according to instructions from the transmission baseband control unit 40 and the reception baseband control unit 82, respectively. It is desirable to use it.

  Next, the ripple measurement process in the communication device 20 will be described.

  First, a first example and a second example will be described as examples of the first embodiment.

  FIG. 4 is a hardware configuration diagram of the communication device 20 according to the first embodiment and the second embodiment. The hardware configuration itself is the same as that of the communication device 20 described in FIG. 3, but the amplifier 46, the primary IF-BPF 48, the multiplier 50, the amplifier 52, and the secondary IF-BPF 54 constitute the first circuit 12, The multiplier 56 constitutes the frequency conversion circuit 16, and includes an RF-BPF 58, an amplifier 60, a switching unit 28, an amplifier 64, an RF-BPF 66, a multiplier 68, an amplifier 70, a primary IF-BPF 72, a multiplier 74, an amplifier 76, The secondary IF-BPF 78 constitutes the second circuit 14. The control unit 22 constitutes the control circuit 18. With such a configuration, the frequency conversion circuit 16 exists between the first circuit 12 and the second circuit 14, and the signal output from the first circuit 12 is converted to the frequency conversion circuit 16. The frequency can be converted by the local oscillator 92 and input to the second circuit 14. As shown in FIG. 3, the transmission unit 26 has two multipliers for frequency conversion. In the case of ripple measurement processing, the multiplication closest to the final stage, that is, the switching unit 28 is performed. It is possible to use a multiplier and not use other multipliers.

  In the first embodiment, first, in the control unit 22, the transmission baseband control unit 40 instructs the D / A converter 44 to transmit a ripple measurement signal. At this time, a plurality of ripple measurement signals are sequentially transmitted, each transmission frequency is made different, and a frequency difference from the reference frequency is provided. Of course, there may be a ripple measurement signal that is the reference frequency itself. The ripple measurement signal is preferably a sine wave (unmodulated carrier wave). That is, it is desirable that the traveling wave has a constant frequency.

  The ripple measurement signal is amplified and frequency-converted in the first circuit 12 by the same processing as the communication signal. Then, the multiplier 56 included in the frequency conversion circuit 16 cancels the frequency difference and performs frequency conversion so that the frequency of the ripple measurement signal becomes the reference frequency. At this time, by transmitting a frequency difference from the reference frequency from the transmission baseband control unit 40 to the local oscillator 92, a signal having a frequency for canceling the frequency difference can be oscillated in the local oscillator 92. The frequency-converted ripple measurement signal is input to the second circuit 14 and output to the reception baseband control unit 82 as a signal amplified, frequency-converted, and demodulated by the same processing as the communication signal. However, the switching unit 28 performs processing for inputting a signal from the transmission unit 26 to the reception unit 32. This process may be, for example, a process of detecting a leakage high frequency from the transmission unit 26 in the amplifier 64.

  The amplitude of the ripple measurement signal received in this way varies depending on the frequency when the signal is input from the control circuit 18 to the first circuit 12 due to the influence of the ripple. Then, the reception baseband control unit 82 calculates the relationship between the frequency of the input signal to the first circuit 12 and the amplitude of the corresponding output signal as a feature value indicating the ripple characteristic of the first circuit 12. Then, the calculated ripple feature amount of the first circuit 12 is stored in the storage unit 24. Then, the influence of the ripple received by the transmission signal in the first circuit 12 is reduced by making a difference in the amplitude of the communication signal transmitted by the transmission baseband control unit 40 according to the stored feature amount of the ripple. Is possible. Further, by storing the ripples acquired in this way in the storage unit 24, the amplitude of the communication signal transmitted from the first circuit 12 can be prevented from being influenced by the ripples in the output from the first circuit 12. If a change is made in advance according to the stored ripple, a trimmer capacitor for performing a correction to cancel the ripple component in advance is installed at the input stage of the circuit, and when the product including the circuit is shipped, The effect of the ripple in the first circuit 12 on the communication signal transmitted from the antenna 30 is further reduced as compared with the case where the capacitance of the trimmer capacitor is adjusted by measuring the ripple and the ripple as a product is minimized. can do. That is, even after the operation of the communication device 20 is started, the ripple can be measured at any time as long as the ripple measurement signal can be passed through the circuit, and the amplitude of the transmission signal can be corrected according to the stored ripple. Therefore, the ripple can be corrected in response to a slight change in the ripple due to the external environment such as temperature and humidity.

  The processing of the control unit 22 in the first embodiment described above will be described more specifically with reference to the processing flowchart.

FIG. 6 is a process flowchart of a process for calculating the ripple of the transmission unit 26 in the control unit 22 in the first embodiment. First, the control unit 22 secures storage areas for the variable F _bc , the variable F _w , the variable N, the sweep counter A, and the variable F _lo , and sets the center frequency and baseband frequency as the reference for the frequency of the ripple measurement signal, respectively. Substitute the bandwidth, baseband bandwidth sweep step, 0 and RF local frequency (S100). The RF local frequency is a frequency for converting the frequency of a signal into a frequency in a radio section. Then, a ripple measurement signal is input to the transmission unit 26 at a frequency of F _bc − (F _w / 2) + (A × F _w / N) (S102). The multiplier 56 multiplies the signal of frequency F _lo + (F _w / 2) − (A × F _w / N) in order to perform frequency conversion of the ripple measurement signal. Then, the frequency of the ripple measurement signal is converted to F _bc + F _lo (S104). That is, for the subsequent ripple measurement signal, the frequency is constant regardless of the sweep counter A. And further, the multiplier 68 multiplies the signal of frequency _{F lo,} converts the frequency of the ripple measurement signal _{F bc} (S106). In this way, the frequency of the ripple measurement signal returns to the frequency when input to the transmission unit 26. Then, the amplitude which is the reception voltage of the ripple measurement signal input from the reception unit 32 is acquired, and − (F _w / 2) + (A ×) which is a frequency difference from the center frequency when input to the transmission unit 26. The amplitude is stored in association with F _w / N) (S108). Then, A is increased by 1 (S110). The processing from S102 to S108 is repeated until A becomes N (S112). When A = N, the change in the received voltage for each difference between the frequency input to the transmitting unit 26 and the center frequency F _bc is performed. Then, it is calculated as a ripple feature value of the transmission unit 26 and stored in the storage unit 24 (S114). The stored feature amount of the ripple may be a correspondence table of a frequency difference between the output frequency and the center frequency and a voltage difference (amplitude difference) between the reception voltage at the center frequency. Or a regression equation.

  Next, in the second embodiment, first, in the control unit 22, the transmission baseband control unit 40 instructs the D / A converter 44 to transmit a ripple measurement signal. At this time, a plurality of ripple measurement signals are sequentially transmitted, and each frequency is set as a predetermined reference frequency. The ripple measurement signal is preferably a sine wave (unmodulated carrier wave). That is, it is desirable that the traveling wave has a constant frequency.

  The ripple measurement signal is amplified and frequency-converted in the first circuit 12 by the same processing as the communication signal. Then, the multiplier 56 included in the frequency conversion circuit 16 performs frequency conversion so as to have a predetermined frequency difference from the reference frequency. At this time, by transmitting a frequency difference from the reference frequency from the transmission baseband control unit 40 to the local oscillator 92, a signal having a frequency for providing the frequency difference can be oscillated in the local oscillator 92. The frequency-converted ripple measurement signal is input to the second circuit 14 and output to the reception baseband control unit 82 as a signal amplified, frequency-converted, and demodulated by the same processing as the communication signal. However, the switching unit 28 performs processing for inputting a signal from the transmission unit 26 to the reception unit 32. This process may be, for example, a process of detecting a leakage high frequency from the transmission unit 26 in the amplifier 64.

  The amplitude of the ripple measurement signal received in this way varies depending on the frequency when the signal is input from the frequency conversion circuit 16 to the second circuit 14 due to the influence of the ripple. Then, the reception baseband control unit 82 calculates the relationship between the frequency of the input signal to the second circuit 14 and the amplitude of the corresponding output signal as a feature value indicating the ripple characteristic of the second circuit 14. The calculated feature amount of the ripple of the second circuit 14 is stored in the storage unit 24. Then, by controlling the amplitude of the output signal in the A / D converter 80 of the reception signal output by the switching unit 28 according to the stored feature value of the ripple, the ripple received by the transmission signal in the second circuit 14 is controlled. It becomes possible to reduce the influence.

  The second circuit 14 includes an RF-BPF 58 and an amplifier 60. If measurement is performed on ripples in the baseband frequency band, circuit elements that contribute to the generation of ripples in the baseband frequency band. Are the primary IF-BPF 48, the secondary IF-BPF 54, the primary IF-BPF 72, and the secondary IF-BPF 78, and most of the calculated ripples are generated in these. For this reason, the ripple in the second circuit 14 can be substantially used as the ripple of the receiving unit 32.

  Then, by storing the ripples acquired in this way in the storage unit 24, the reception baseband control unit 82 according to the stored ripples so as to eliminate the influence of the ripples in the output from the reception unit 32. If a correction is performed in step (3), a trimmer capacitor for correcting the ripple component in advance is installed at the input stage of the circuit, and when the product including the circuit is shipped, the ripple of the circuit is measured. Compared with adjusting the capacity and minimizing the ripple as a product, the influence of the ripple at the receiving unit 32 on the communication signal received by the antenna 30 can be further reduced. That is, even after the operation of the communication device 20 is started, as long as the ripple measurement signal can be passed through the circuit, the ripple can be measured at any time, and the amplitude of the received signal can be corrected according to the stored ripple. Therefore, the ripple can be corrected in response to a slight change in the ripple due to the external environment such as temperature and humidity.

  The processing of the control unit 22 in the second embodiment described above will be described more specifically with reference to the processing flowchart.

FIG. 7 is a process flow diagram of a process of calculating the ripple of the reception unit 32 in the control unit 22 in the second embodiment. First, the control unit 22 secures storage areas for the variable F _bc , the variable F _w , the variable N, the sweep counter A, and the variable F _lo , and sets the center frequency and baseband frequency as the reference for the frequency of the ripple measurement signal, respectively. Substitute the bandwidth, baseband bandwidth sweep step, 0 and RF local frequency (S150). Then, a ripple measurement signal is input to the transmission unit 26 at a frequency of F _bc (S152). The multiplier 56 multiplies the signal of frequency F _lo + (F _w / 2) − (A × F _w / N) in order to perform frequency conversion of the ripple measurement signal. Then, the frequency of the ripple measurement signal is converted into F _bc + F _lo + (F _w / 2) − (A × F _w / N) (S154). That is, for the subsequent ripple measurement signal, the frequency is changed by the sweep counter A. And further, the multiplier 68 multiplies the signal of frequency _{F lo,} the frequency of the ripple measurement signal _{F bc + (F w / 2} ) - into a _{(A × F w / N)} (S156). Then, the amplitude that is the reception voltage of the ripple measurement signal input from the reception unit 32 is acquired and is the frequency difference from the center frequency when input to the transmission unit 26 (F _w / 2) − (A × F _The amplitude is stored in association with ( _w / N) (S158). Then, A is increased by 1 (S160). The processing from S152 to S158 is repeated until A becomes N (S162), and when A = N, the change in the reception voltage for each difference between the center frequency F _bc and the frequency when input to the transmission unit 26 is performed. Then, it is calculated as a ripple feature amount of the receiving unit 32 and stored in the storage unit 24 (S164). The stored feature amount of the ripple may be a correspondence table of a frequency difference between the output frequency and the center frequency and a voltage difference (amplitude difference) between the reception voltage at the center frequency. Or a regression equation.

  Next, a third example and a fourth example will be described as examples of the second embodiment.

  FIG. 5 is a hardware configuration diagram of the communication device 20 according to the third embodiment and the fourth embodiment. The hardware configuration itself is the same as that of the communication apparatus 20 described in FIG. 3, but the amplifier 46, the primary IF-BPF 48, the multiplier 50, the amplifier 52, the secondary IF-BPF 54, the multiplier 56, the RF-BPF 58, The amplifier 60, the switching unit 28, the amplifier 64, and the RF-BPF 66 constitute the first circuit 12, the multiplier 68 constitutes the frequency conversion circuit 16, the amplifier 70, the primary IF-BPF 72, the multiplier 74, the amplifier 76, The secondary IF-BPF 78 constitutes the second circuit 14. The control unit 22 constitutes the control circuit 18. With such a configuration, the frequency conversion circuit 16 exists between the first circuit 12 and the second circuit 14, and the signal output from the first circuit 12 is converted to the frequency conversion circuit 16. The frequency can be converted by the local oscillator 92 and input to the second circuit 14. As shown in FIG. 3, the receiver 32 has two multipliers for frequency conversion. In the case of the ripple measurement process, the multiplication closest to the first stage, that is, the switching unit 28 is performed. A multiplier may be used and no other multipliers may be used.

  In the third embodiment, first, in the control unit 22, the transmission baseband control unit 40 instructs the D / A converter 44 to transmit a ripple measurement signal. At this time, a plurality of ripple measurement signals are sequentially transmitted, each transmission frequency is made different, and a frequency difference from the reference frequency is provided. Of course, there may be a ripple measurement signal that is the reference frequency itself. The ripple measurement signal is preferably a sine wave (unmodulated carrier wave). That is, it is desirable that the traveling wave has a constant frequency.

  The ripple measurement signal is amplified and frequency-converted in the first circuit 12 by the same processing as the communication signal. However, the switching unit 28 performs processing for inputting a signal from the transmission unit 26 to the reception unit 32. This process may be, for example, a process of detecting a leakage high frequency from the transmission unit 26 in the amplifier 64. The multiplier 68 included in the frequency conversion circuit 16 cancels the frequency difference and performs frequency conversion so that the frequency of the ripple measurement signal becomes the reference frequency. At this time, by transmitting a frequency difference from the reference frequency from the reception baseband control unit 82 to the local oscillator 94, a signal having a frequency for canceling the frequency difference can be oscillated in the local oscillator 94. The frequency-converted ripple measurement signal is input to the second circuit 14 and output to the reception baseband control unit 82 as a signal amplified, frequency-converted, and demodulated by the same processing as the communication signal.

  The amplitude of the ripple measurement signal received in this way varies depending on the frequency when the signal is input from the control circuit 18 to the first circuit 12 due to the influence of the ripple. Then, the reception baseband control unit 82 calculates the relationship between the frequency of the input signal to the first circuit 12 and the amplitude of the corresponding output signal as a feature value indicating the ripple characteristic of the first circuit 12. Then, the calculated ripple feature amount of the first circuit 12 is stored in the storage unit 24. Then, by controlling the amplitude of the communication signal transmitted by the transmission baseband control unit 40 in accordance with the stored feature amount of the ripple, the influence of the ripple received by the transmission signal in the first circuit 12 can be reduced. It becomes possible.

  The first circuit 12 also includes an amplifier 64 and an RF-BPF 66. When measurement is performed on ripples in the baseband frequency band, circuit elements that contribute to the generation of ripples in the baseband frequency band are as follows. The primary IF-BPF 48, the secondary IF-BPF 54, the primary IF-BPF 72, and the secondary IF-BPF 78, and most of the calculated ripples are generated in these. For this reason, the ripple in the first circuit 12 can be substantially used as the ripple of the transmitter 26.

  Then, by storing the ripple acquired in this way in the storage unit 24, the amplitude of the communication signal transmitted from the first circuit 12 can be prevented from being influenced by the ripple in the output from the first circuit 12. If a change is made in advance according to the stored ripple, a trimmer capacitor for performing a correction to cancel the ripple component in advance is installed at the input stage of the circuit, and when the product including the circuit is shipped, The effect of the ripple in the first circuit 12 on the transmission power of the communication signal transmitted from the antenna 30 as compared to adjusting the capacitance of the trimmer capacitor by measuring the ripple and minimizing the ripple as a product. Can be further reduced. That is, even after the operation of the communication device 20 is started, the ripple can be measured at any time as long as the ripple measurement signal can be passed through the circuit, and the amplitude of the transmission signal can be corrected according to the stored ripple. Therefore, the ripple can be corrected in response to a slight change in the ripple due to the external environment such as temperature and humidity.

  The processing of the control unit 22 in the third embodiment described above will be described more specifically with reference to the processing flowchart.

FIG. 8 is a process flow diagram of a process for calculating the ripple of the transmission unit 26 in the control unit 22 in the third embodiment. First, the control unit 22 secures storage areas for the variable F _bc , the variable F _w , the variable N, the sweep counter A, and the variable F _lo , and sets the center frequency and baseband frequency as the reference for the frequency of the ripple measurement signal, respectively. Substitute the bandwidth, baseband bandwidth sweep step, 0 and RF local frequency (S200). Then, a ripple measurement signal is input to the transmission unit 26 at a frequency of F _bc − (F _w / 2) + (A × F _w / N) (S202). The multiplier 56 multiplies the signal of the frequency _{Flo in} order to perform frequency conversion of the ripple measurement signal. Then, the frequency of the ripple measurement signal is converted to F _bc − (F _w / 2) + (A × F _w / N) + F _lo (S204). And further, in the multiplier 68, the frequency _{F lo - (F w / 2} ) + multiplies the signal _{(A × F w / N)} , for converting the frequency of the ripple measurement signal _{F bc} (S206). That is, for the subsequent ripple measurement signal, the frequency is constant regardless of the sweep counter A. In this way, the frequency of the ripple measurement signal returns to the frequency when input to the transmission unit 26. Then, the amplitude which is the reception voltage of the ripple measurement signal input from the reception unit 32 is acquired, and − (F _w / 2) + (A ×) which is a frequency difference from the center frequency when input to the transmission unit 26. The amplitude is stored in association with F _w / N) (S208). Then, A is increased by 1 (S210). The processing from S202 to S208 is repeated until A becomes N (S212), and when A = N, the change in the received voltage for each difference between the center frequency F _bc and the frequency when input to the transmitter 26 is performed. Then, it is calculated as the ripple feature amount of the transmission unit 26 and stored in the storage unit 24 (S214). The stored feature amount of the ripple may be a correspondence table of a frequency difference between the output frequency and the center frequency and a voltage difference (amplitude difference) between the reception voltage at the center frequency. Or a regression equation.

  Next, in the fourth embodiment, first, in the control unit 22, the transmission baseband control unit 40 instructs the D / A converter 44 to transmit a ripple measurement signal. At this time, a plurality of ripple measurement signals are sequentially transmitted, and each frequency is set as a predetermined reference frequency. The ripple measurement signal is preferably a sine wave. That is, it is desirable that the traveling wave has a constant frequency.

  The ripple measurement signal is amplified and frequency-converted in the first circuit 12 by the same processing as the communication signal. However, the switching unit 28 performs processing for inputting a signal from the transmission unit 26 to the reception unit 32. This process may be, for example, a process of detecting a leakage high frequency from the transmission unit 26 in the amplifier 64. Then, the multiplier 68 included in the frequency conversion circuit 16 performs frequency conversion so as to have a predetermined frequency difference from the reference frequency. At this time, by transmitting a frequency difference from the reference frequency from the reception baseband control unit 82 to the local oscillator 94, a signal having a frequency for providing the frequency difference can be oscillated in the local oscillator 94. The frequency-converted ripple measurement signal is input to the second circuit 14 and output to the reception baseband control unit 82 as a signal amplified, frequency-converted, and demodulated by the same processing as the communication signal.

  The amplitude of the ripple measurement signal received in this way varies depending on the oscillation frequency of the local oscillator 94 due to the influence of the ripple of the second circuit 14. Then, the reception baseband control unit 82 calculates the relationship between the oscillation frequency of the local oscillator 94 and the amplitude of the corresponding output signal as a feature value indicating the ripple characteristic of the second circuit 14. The calculated feature amount of the ripple of the second circuit 14 is stored in the storage unit 24. Then, by making a difference in the amplitude of the output signal of the A / D converter 80 in accordance with the stored feature value of the ripple, it becomes possible to reduce the influence of the ripple that the transmission signal receives in the second circuit 14. .

  Then, by storing the ripple acquired in this manner in the storage unit 24, the reception baseband control unit is previously set according to the stored ripple so that the influence of the ripple is eliminated in the output from the reception unit 32. If the correction is performed at 82, a trimmer capacitor for correcting the ripple component in advance is installed at the input stage of the circuit, and when the product including the circuit is shipped, the ripple of the circuit is measured. As a result, the influence of the ripple at the receiving unit 32 on the communication signal received by the antenna 30 can be further reduced as compared with the case where the ripple of the product is minimized. That is, even after the operation of the communication device 20 is started, as long as the ripple measurement signal can be passed through the circuit, the ripple can be measured at any time, and the amplitude of the received signal can be corrected according to the stored ripple. Therefore, the ripple can be corrected in response to a slight change in the ripple due to the external environment such as temperature and humidity.

  The processing of the control unit 22 in the fourth embodiment described above will be described more specifically with reference to the processing flowchart.

FIG. 9 is a process flow diagram of a process of calculating the ripple of the receiving unit 32 in the control unit 22 in the fourth embodiment. First, the control unit 22 secures storage areas for the variable F _bc , the variable F _w , the variable N, the sweep counter A, and the variable F _lo , and sets the center frequency and baseband frequency as the reference for the frequency of the ripple measurement signal, respectively. Substitute the bandwidth, baseband bandwidth sweep step, 0 and RF local frequency (S250). Then, a ripple measurement signal is input to the transmission unit 26 at a frequency of F _bc (S252). The multiplier 56 multiplies the signal of the frequency _{Flo in} order to perform frequency conversion of the ripple measurement signal. Then, the frequency of the ripple measurement signal is converted to F _bc + F _lo (S254). That is, for the subsequent ripple measurement signal, the frequency is changed by the sweep counter A. Further, the multiplier 68 multiplies the signal of frequency F _lo + (F _w / 2) − (A × F _w / N), and sets the frequency of the ripple measurement signal to F _bc − (F _w / 2). Conversion to + (A × F _w / N) (S256). Then, the amplitude which is the reception voltage of the ripple measurement signal input from the reception unit 32 is acquired, and − (F _w / 2) + (A ×) which is a frequency difference from the center frequency when input to the transmission unit 26. The amplitude is stored in association with F _w / N) (S258). Then, A is increased by 1 (S260). The processing from S252 to S258 is repeated until A becomes N (S262). When A = N, the change in the received voltage for each difference between the center frequency F _bc and the frequency when input to the transmission unit 26 is performed. Then, it is calculated as a ripple feature amount of the receiving unit 32 and stored in the storage unit 24 (S264). The stored feature amount of the ripple may be a correspondence table of a frequency difference between the output frequency and the center frequency and a voltage difference (amplitude difference) between the reception voltage at the center frequency. Or a regression equation.

It is a block diagram of the ripple characteristic correction circuit which concerns on embodiment of this invention. It is a functional block diagram of the communication apparatus which concerns on embodiment of this invention. It is a hardware block diagram of the communication apparatus which concerns on embodiment of this invention. It is a hardware block diagram of the communication apparatus which concerns on embodiment of this invention. It is a hardware block diagram of the communication apparatus which concerns on embodiment of this invention. It is a processing flow figure of the communication apparatus which concerns on embodiment of this invention. It is a processing flow figure of the communication apparatus which concerns on embodiment of this invention. It is a processing flow figure of the communication apparatus which concerns on embodiment of this invention. It is a processing flow figure of the communication apparatus which concerns on embodiment of this invention.

Explanation of symbols

  10 ripple characteristic correction circuit, 12 first circuit, 14 second circuit, 16 frequency conversion circuit, 18 control circuit, 20 communication device, 22 control unit, 24 storage unit, 26 transmission unit, 28 switching unit, 30 antenna, 32 reception Unit, 34, 36 Frequency conversion unit, 40 Transmission baseband control unit, 44 D / A converter, 46, 52, 60, 64, 70, 76 Amplifier, 50, 56, 68, 74 Multiplier, 80 A / D converter , 82 Reception baseband control unit, 90, 92, 94 Local oscillator.

Claims (16)

In a ripple characteristic correction circuit for measuring a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including the first circuit and the second circuit,
First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the first circuit;
Frequency conversion means for converting the frequency of the ripple measurement signal so that the ripple measurement signal output from the first circuit becomes the reference frequency;
Second ripple measurement signal input means for inputting the ripple measurement signal frequency-converted by the frequency conversion means to the second circuit;
Amplitude measurement means for measuring the amplitude of the ripple measurement signal output from the second circuit;
A ripple calculating means for calculating a characteristic amount of the ripple of the first circuit based on the amplitude of each frequency difference measured by the amplitude measuring means;
A ripple characteristic correction circuit comprising: The ripple characteristic correction circuit according to claim 1,
Amplitude changing means for changing the amplitude of the signal input to the first circuit so as to cancel the ripple of the first circuit indicated by the ripple feature amount calculated by the ripple calculating means;
And a ripple characteristic correction circuit. In a ripple characteristic correction circuit for measuring a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including the first circuit and the second circuit,
First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals having a reference frequency to the first circuit;
Frequency conversion means for converting the frequency of the ripple measurement signal so that the ripple measurement signal output from the first circuit has a different frequency difference from the reference frequency;
Second ripple measurement signal input means for inputting the ripple measurement signal frequency-converted by the frequency conversion means to the second circuit;
Amplitude measurement means for measuring the amplitude of the ripple measurement signal output from the second circuit;
A ripple calculating means for calculating a characteristic amount of the ripple of the second circuit based on the amplitude of each frequency difference measured by the amplitude measuring means;
A ripple characteristic correction circuit comprising: In the ripple characteristic correction circuit according to claim 3,
Amplitude changing means for changing the amplitude of the signal output from the second circuit so as to cancel the ripple of the second circuit indicated by the ripple feature amount calculated by the ripple calculating means;
And a ripple characteristic correction circuit. In a communication device including a transmission circuit and a reception circuit,
The transmission circuit includes at least one stage of frequency conversion means for converting a transmission signal into a transmission frequency,
First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the transmission circuit;
Ripple measurement signal frequency conversion means for converting the frequency of the ripple measurement signal so that the ripple measurement signal becomes the reference frequency by the frequency conversion means;
Second ripple measurement signal input means for inputting the ripple measurement signal output from the transmission circuit to the reception circuit;
Amplitude measuring means for measuring the amplitude of the ripple measurement signal output from the receiving circuit;
Ripple calculation means for calculating a feature amount of a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in the transmission circuit based on the amplitude for each frequency difference measured by the amplitude measurement means;
A communication device comprising: In a communication device including a transmission circuit and a reception circuit,
The transmission circuit includes at least one stage of frequency conversion means for converting a transmission signal into a transmission frequency,
First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals having a reference frequency to the transmission circuit;
Ripple measurement signal frequency conversion means for converting the frequency of the ripple measurement signal by the frequency conversion means so that the ripple measurement signal has a different frequency difference from the reference frequency, and
Second ripple measurement signal input means for inputting the ripple measurement signal output from the transmission circuit to the reception circuit;
Amplitude measuring means for measuring the amplitude of the ripple measurement signal output from the receiving circuit;
Ripple calculation means for calculating a feature amount of a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in the reception circuit based on the amplitude for each frequency difference measured by the amplitude measurement means;
A communication device comprising: In a communication device including a transmission circuit and a reception circuit,
The receiving circuit includes at least one stage of frequency converting means for converting a received signal to an intermediate frequency,
First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the transmission circuit;
Second ripple measurement signal input means for inputting the ripple measurement signal output from the transmission circuit to the reception circuit;
Ripple measurement signal frequency conversion means for converting the frequency of the ripple measurement signal so that the ripple measurement signal becomes the reference frequency by the frequency conversion means;
Amplitude measuring means for measuring the amplitude of the ripple measurement signal output from the receiving circuit;
Ripple calculation means for calculating a feature amount of a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in the transmission circuit based on the amplitude for each frequency difference measured by the amplitude measurement means;
A communication device comprising: In a communication device including a transmission circuit and a reception circuit,
The receiving circuit includes at least one stage of frequency converting means for converting a received signal to an intermediate frequency,
First ripple measurement signal input means for inputting a plurality of ripple measurement signals having a reference frequency to the transmission circuit;
Second ripple measurement signal input means for inputting the ripple measurement signal output from the transmission circuit to the reception circuit;
Ripple measurement signal frequency conversion means for converting the frequency of the ripple measurement signal by the frequency conversion means so that the ripple measurement signal has a different frequency difference from the reference frequency, and
Amplitude measuring means for measuring the amplitude of the ripple measurement signal output from the receiving circuit;
Ripple calculation means for calculating a feature amount of a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in the reception circuit based on the amplitude for each frequency difference measured by the amplitude measurement means;
A communication device comprising: The communication device according to claim 5 or 6,
The ripple measurement signal frequency conversion means converts the frequency of the ripple measurement signal by the final stage frequency conversion means among the plurality of frequency conversion means.
A communication device. The communication device according to claim 7 or 8,
The ripple measurement signal frequency conversion means converts the frequency of the ripple measurement signal by a first-stage frequency conversion means among the plurality of frequency conversion means.
A communication device. The communication device according to claim 5 or 7,
Amplitude changing means for changing the amplitude of a signal input to the transmission circuit so as to cancel the ripple of the transmission circuit indicated by the ripple feature amount calculated by the ripple calculation means;
A communication device further comprising: The communication device according to claim 6 or 8,
Amplitude changing means for changing the amplitude of the signal output from the receiving circuit so as to cancel the ripple of the receiving circuit indicated by the ripple feature amount calculated by the ripple calculating means;
A communication device further comprising: In a ripple characteristic correction method for measuring a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including the first circuit and the second circuit,
A first ripple measurement signal input step for sequentially inputting a plurality of ripple measurement signals each having a frequency difference different from a reference frequency to the first circuit;
A frequency conversion step of converting the frequency of the ripple measurement signal so that the ripple measurement signal output from the first circuit becomes the reference frequency;
A second ripple measurement signal input step for inputting the ripple measurement signal frequency-converted in the frequency conversion step to the second circuit;
An amplitude measurement step of measuring an amplitude of the ripple measurement signal output from the second circuit;
A ripple calculating step of calculating a characteristic amount of the ripple of the first circuit based on the amplitude of each frequency difference measured in the amplitude measuring step;
A method for correcting ripple characteristics, comprising: In the ripple characteristic correction method according to claim 13,
An amplitude changing step of changing the amplitude of the signal input to the first circuit so as to cancel the ripple of the first circuit indicated by the ripple feature amount calculated in the ripple calculating step;
The method for correcting ripple characteristics, further comprising: In a ripple characteristic correction method for measuring a ripple indicating an amplitude change of an output signal due to a frequency change of an input signal in a circuit including the first circuit and the second circuit,
First ripple measurement signal input means for sequentially inputting a plurality of ripple measurement signals having a reference frequency to the first circuit;
A frequency conversion step of converting the frequency of the ripple measurement signal so that the ripple measurement signal output from the first circuit has a different frequency difference from the reference frequency;
A second ripple measurement signal input step for inputting the ripple measurement signal frequency-converted in the frequency conversion step to the second circuit;
An amplitude measurement step of measuring an amplitude of the ripple measurement signal output from the second circuit;
A ripple calculating step of calculating a characteristic amount of the ripple of the second circuit based on the amplitude of each frequency difference measured in the amplitude measuring step;
A method for correcting ripple characteristics, comprising: The ripple characteristic correction method according to claim 15,
An amplitude changing step of changing the amplitude of the signal output from the second circuit so as to cancel the ripple of the second circuit indicated by the ripple feature amount calculated in the ripple calculating step;
The method for correcting ripple characteristics, further comprising:

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