CN111355503A - Compensating device for amplitude modulation and phase modulation distortion - Google Patents
Compensating device for amplitude modulation and phase modulation distortion Download PDFInfo
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- CN111355503A CN111355503A CN201811571902.5A CN201811571902A CN111355503A CN 111355503 A CN111355503 A CN 111355503A CN 201811571902 A CN201811571902 A CN 201811571902A CN 111355503 A CN111355503 A CN 111355503A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- 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
- H04B1/14—Automatic detuning arrangements
Abstract
The invention discloses a compensating device for amplitude modulation and phase modulation distortion. The transmission circuit comprises an amplifying circuit, a phase shift adjusting circuit and an output circuit; the amplifying circuit is used for outputting an amplifying signal according to an input signal; the phase shift adjusting circuit comprises at least one of an adjustable capacitor and an adjustable inductor, is arranged between the amplifying circuit and the output circuit and is used for adjusting the phase shift of the amplifying signal according to a control signal; the output circuit is used for outputting an output signal according to the amplified signal. The control circuit is used for generating the control signal according to the input signal, wherein the control signal is changed along with the input signal.
Description
Technical Field
The invention relates to a distortion compensation device, in particular to a compensation device for amplitude modulation and phase modulation distortion.
Background
The output of the power amplifier of the wireless transceiver has AM-PM distortion (amplitude-modulation phase-modulation distortion), which causes the problem of spectral proliferation. The spectrum proliferation problem makes it difficult for those skilled in the art to integrate the power amplifier into the wireless transceiver, and also reduces the performance of the transmitting circuit of the wireless transceiver.
Current techniques for solving the problem of amplitude modulation and phase modulation distortion include cartesian feedback (cartesian feedback) techniques and adaptive digital predistortion techniques. The cartesian feedback technique requires an additional feedback demodulator and error amplifier, which increases circuit complexity and cost; cartesian feedback can be found in inter-lane textbooks (e.g., BehzadRazavi, "Fundamentals of Microelectronics,2nd Edition," ISBN-10: 9781118156322/ISBN-13: 978-. The adaptive digital predistortion technique may require an increase in the bandwidth of the baseband signal, resulting in higher power consumption, and the coupling effect between the up-conversion path and the down-conversion path of the technique may also reduce the predistortion effect; adaptive digital predistortion techniques may be found in U.S. patent No. 5524286.
Disclosure of Invention
An object of the present invention is to provide a compensation apparatus for amplitude modulation and phase modulation distortion, so as to avoid the problems of the prior art.
According to an embodiment of the present invention, the apparatus for compensating for am and pm distortion of the present invention includes a transmitting circuit and a control circuit. The transmission circuit comprises an amplifying circuit, a phase shift adjusting circuit and an output circuit; the amplifying circuit is used for outputting an amplifying signal according to an input signal; the phase shift adjusting circuit comprises at least one of an adjustable capacitor and an adjustable inductor, is arranged between the amplifying circuit and the output circuit and is used for adjusting the phase shift of the amplifying signal according to a control signal; the output circuit is used for outputting an output signal according to the amplified signal. The control circuit is used for generating the control signal according to the input signal, wherein the control signal is changed along with the input signal. The present embodiment is applicable to a transmission circuit or an audio transmission circuit for a communication apparatus.
According to another embodiment of the present invention, the apparatus for compensating for am and pm distortion of the present invention comprises a receiving circuit and a control circuit. The receiving circuit comprises an input circuit, a phase shift adjusting circuit and a radio frequency to base frequency receiving circuit. The input circuit is used for generating an analog receiving signal according to a radio frequency signal; the phase shift adjusting circuit is coupled with the input circuit and is used for adjusting the phase shift of the analog receiving signal according to a control signal; the RF-to-baseband receiving circuit is used for generating a digital receiving signal according to the analog receiving signal. The control circuit is used for generating the control signal according to the digital receiving signal, wherein the control signal is changed along with the digital receiving signal. The present embodiment is applicable to a receiving circuit for a communication apparatus.
The features, implementations, and technical advantages of the present invention are described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 shows an embodiment of the apparatus for compensating AM/PM distortion according to the present invention;
FIG. 2 shows an embodiment of the transmit circuit of FIG. 1;
FIG. 3 shows another embodiment of the transmit circuit of FIG. 1;
FIG. 4 shows an embodiment of the control circuit of FIG. 1;
FIG. 5 shows an embodiment of the control signal generating circuit of FIG. 4;
FIG. 6 shows another embodiment of the apparatus for compensating AM and PM distortion of the present invention;
FIG. 7 shows steps performed by the calibration circuit of FIG. 6;
FIG. 8 shows an embodiment of the calibration circuit of FIG. 6;
FIG. 9a illustrates an embodiment of the self-mixing mixer of FIG. 8;
FIG. 9b illustrates an embodiment of the adaptive calibration circuit of FIG. 8;
FIG. 10 shows another embodiment of the apparatus for compensating for AM and PM distortion of the present invention;
FIG. 11 shows an embodiment of the RF-to-baseband receiving circuit of FIG. 10; and
fig. 12 shows another embodiment of the apparatus for compensating for am and pm distortion of the present invention.
Description of the symbols
100 amplitude modulation and phase modulation distortion compensation device
110 transmission circuit
120 control circuit
112 amplifier circuit
114 phase shift adjusting circuit
116 output circuit
SINInput signal
SAMPAmplifying a signal
SCTRLControl signal
SOUTOutput signal
SIN_IIn-phase signal
SIN_QQuadrature phase signal
SAMP_1First amplified signal
SAMP_2Second amplified signal
SCTRL_1A first control signal
SCTRL_2The second control signal
210 oscillating source
220 first DRAC (first digital to radio frequency amplitude converter)
230 second DRAC (second digital to radio frequency amplitude converter)
LO1At least one first oscillation signal
LO2At least one second oscillation signal
240 first resonant circuit
250 second resonant circuit
260 signal synthesizer
SIN_DDigital audio signal
SIN_AAnalog audio signal
310 DAC (digital-to-analog converter)
320 audio amplifier
330 adjustable capacitor
340 output pin
410 calculation circuit
420 control signal generating circuit
SIN_AMPCalculated value
510 look-up table circuit
520 DAC (digital-to-analog converter)
530 filter circuit
SCTRL_DDigital control signal
SAAnalog signal
Compensating device for 600 amplitude modulation and phase modulation distortion
610 correction circuit
SCALCorrecting signal
S710 to S740
810 self-mixing mixer
820 adaptive calibration circuit
SMIXMixed frequency signal
SMIX_INMixed frequency input signal
SMIX_LOFrequency mixer oscillation signal
910 gain controller
920 ADC (analog to digital converter)
930 compare and calibrate circuit
SGAINGain control signal
SFEEDBACKDigital feedback signal
1000 amplitude modulation and phase modulation distortion compensation device
1010 receiving circuit
1020 control circuit
1012 input circuit
1014 phase shift adjusting circuit
1016 RF-to-baseband receiving circuit
SRFRadio frequency signal
SRF_AAnalog received signal
SBBDigital received signal
1110 frequency mixer
1120 gain controller
1130 ADC (analog-to-digital converter)
SIFIntermediate frequency signal
SGAINGain control signal
1200 amplitude modulation and phase modulation distortion compensation device
1210 correction circuit
Detailed Description
The present invention discloses a compensation device for AM-PM distortion (amplitude-modulation to phase-modulation distortion), which can be applied to a transmission or reception circuit of a communication device and to an audio transmission circuit, but is not limited thereto. The compensation device has the advantages of easiness in implementation, low cost, low power consumption and the like.
Fig. 1 shows an embodiment of the apparatus for compensating am/pm distortion according to the present invention. The apparatus 100 for compensating am/pm distortion of fig. 1 comprises a transmitting circuit 110 and a control circuit 120. The transmitting circuit 110 includes an amplifying circuit 112, a phase shift adjusting circuit 114 and an output circuit 116. The amplifying circuit 112 is based on an input signal SINOutputs an amplified signal SAMPThe input signal SINDepending on implementation requirements, the signal may be differential or single-ended, and may be a single signal or consist of multiple signals, such as an in-phase (in-phase) signal and a quadrature-phase (quadrature-phase) signal. The phase shift adjusting circuit 114 includes at least one of an adjustable capacitor and an adjustable inductor, which is disposed between the amplifying circuit 114 and the output circuit 116 according to a control signal SCTRLAdjusting the amplified signal SAMPPhase shift (phase shift); for example, the control signal SCTRLComprises a control voltage, the tunable capacitor comprises a varactor (varactor), and the capacitance value of the varactor is changed along with the control voltage; for another example, the control signal SCTRLThe adjustable capacitor comprises a plurality of parallel capacitor paths, each capacitor path comprises a capacitor element and a switch, and each switch is based on the control signal SCTRLAnd is turned on or off to determine the capacitance of the capacitor. The output circuit 116 outputs the amplified signal SAMPOutput an output signal SOUT. The control circuit 120 is based on the input signal SINGenerating the control signal SCTRLThe control signal SCTRLFollowing the input signal SINAnd then changing; in other words, different input signals SINMay correspond to different control signals S respectivelyCTRLWherein the input signal SINAnd the control signal SCTRLOptionally pre-stored in the control circuit 120 and optionally periodically/non-periodically updated.
FIG. 2 shows an embodiment of the transmitting circuit 110 of FIG. 1. In this embodiment, the transmission circuit 110 is a wireless transmission circuit (e.g., a wireless transmission circuit and a Bluetooth transmission circuit conforming to 802.11a/b/g/n/ac specifications)Narrow Band Internet of Things (NBIOT) transmission circuit, etc.), the input signal SIN(e.g., baseband signal) comprises an in-phase signal SIN_IAnd a quadrature phase signal SIN_QThe amplified signal SAMPIncludes a first amplified signal SAMP_1And a second amplified signal SAMP_2The control signal SCTRLIncludes a first control signal SCTRL_1And a second control signal SCTRL_2。
As shown in fig. 2, the amplifying circuit 112 includes an oscillation source 210 (e.g., a frequency synthesizer), a first digital-to-RF-amplitude converter (DRAC) 220 and a second DRAC 230. The oscillation source 210 provides at least a first oscillation signal LO1(e.g., frequency f)LOAnd phases of 0 degree and 180 degrees, respectively) and at least one second oscillation signal LO2(e.g., frequency f)LOAnd the phases are 90 degrees and 270 degrees, respectively). The first DRAC 220 is based on the at least one first oscillation signal LO1The in-phase signal SIN_IIs converted into the first amplified signal SAMP_1. The second DRAC230 generates the second oscillating signal LO according to the at least one second oscillating signal LO2The quadrature phase signal SIN_QIs converted into the second amplified signal SAMP_2. Further description of the amplifier circuit 112 can be found in the following documents: alavi, Student number, IEEE, Robert Bogdan Staszewski, Fellow, IEEE, LeoC.N.de Vreede, Senior number, IEEE, and John R.Long, number, IEEE, "A Wideband 213-bit All-Digital I/Q RF-DAC", IEEE TRANSACTIONS MICROVE THENTETC HNIQUES, VOL.62, NO.4, APRIL 2014.
As shown in fig. 2, the phase shift adjusting circuit 114 includes a first resonant circuit 240 and a second resonant circuit 250. The first resonant circuit 240 is responsive to the first control signal SCTRL_1Adjusting the first amplified signal SAMP_1The phase shift of (2). The second resonant circuit 250 is coupled to the second control signal SCTRL_2Adjusting the second amplified signal SAMP_2The phase shift of (2). Each of the first resonant circuit 240 and the second resonant circuit 250 includes a parallel connectionA capacitor and an inductor, the value of the capacitor and/or the value of the inductor being dependent on the control signal SCTRLAnd is adjusted.
As shown in FIG. 2, the output circuit 116 includes a signal synthesizer 260 for synthesizing the first amplified signal SAMP_1And the second amplified signal SAMP_2Adding to generate the output signal SOUT. Signal combiner 260 alone may be a known or self-developed circuit, the details of which are omitted herein.
Fig. 3 shows another embodiment of the transmitting circuit 110 of fig. 1, which can be applied to an audio transmitting device. In the implementation of FIG. 3, the input signal SINIs a digital audio signal SIN_D(ii) a The amplifying circuit 112 comprises a digital-to-analog converter (DAC)310 and an audio amplifier 320, wherein the DAC 310 is configured to output the digital audio signal SIN_DGenerating an analog audio signal SIN_AThe audio amplifier 320 is based on the analog audio signal SIN_AGenerating the amplified signal SAMP(ii) a The phase shift adjusting circuit 114 includes an adjustable capacitor 330; the output circuit 116 includes an output pin 340 for outputting the amplified signal SAMPOutput the output signal SOUT。
Fig. 4 shows an embodiment of the control circuit 120 of fig. 1. The control circuit 120 of fig. 4 includes a calculating circuit 410 and a control signal generating circuit 420. The calculating circuit 410 is based on the input signal SIN(e.g., the same phase signal S as described aboveIN_IWith quadrature phase signal SIN_Q) Providing an input signal SINA calculated value S of amplitude correlation ofIN_AMP(for example:
) To the control signal generation circuit 420. The control signal generating circuit 420 generates the calculated value S according to the calculated valueIN_AMPDetermining the control signal SCTRLIs (e.g. by controlling the voltage magnitude of the voltage) or is (e.g. is) made up of the calculated value SIN_AMPA plurality of converted levels, each level controlling the on/off state of a switch), and outputting the control signal SCTRLTo the phase shift adjustment circuit 114. It is worth noting thatIf the input signal is a single signal (e.g., the digital audio signal S of FIG. 3)IN_D) And the amplitude can be directly determined, the calculating circuit 410 can be optionally omitted, and the control signal generating circuit 420 can directly generate the control signal according to the input signal SINDetermines the control signal SCTRLIntensity or level of.
Fig. 5 shows an embodiment of the control signal generating circuit 420 of fig. 4. The control signal generating circuit 420 of FIG. 5 includes a look-up table 510, a digital-to-analog converter (DAC)520, and a filter circuit 530. The look-up circuit 510 is used for looking up the input signal SINThe amplitude of the signal is output as a digital control signal SCTRL_D. DAC 520 according to the digital control signal SCTRL_DGenerating an analog signal SA. A filter circuit 530 (e.g., a low pass filter) for filtering the analog signal SAGenerating a filter signal as the control signal SCTRL. It is noted that it is not necessary to apply the analog signal SAPerforming filtering, the filtering circuit 530 can be optionally omitted, in which case the analog signal SAAs the control signal SCTRL。
Fig. 6 shows another embodiment of the apparatus for compensating for am and pm distortion of the present invention. Compared to fig. 1, the apparatus 600 for compensating am/pm distortion of fig. 6 further includes a correction circuit 610. The calibration circuit 610 is responsive to the control signal SCTRLAnd the output signal SOUTOutputs a correction signal SCALTo the control circuit 120, so that the control circuit 120 can be operated according to the calibration signal SCALDetermining the input signal SINAnd the control signal SCTRLThe relationship between them. In one implementation example, the input signal S isINIn the case of a specific value (e.g., the input signal S)INWhen the amplitude of the control signal S is a specific amplitude), the calibration circuit 610 performs at least the following steps (as shown in fig. 7) in sequence to determine the control signal SCTRLAnd the output signal SINThe relationship between the changes of (c):
step S710: make the control signal SCTRLChanges in a current direction. For example, the controlSystem signal SCTRLIs a control voltage, this step commands the control signal SCTRLIncreasing/decreasing a unit of a preset voltage; for another example, the control signal SCTRLIs composed of multiple levels (e.g., 00011 is used to control five switches in the capacitor path, respectively, where level 0 is used to make the switches non-conductive and level 1 is used to make the switches conductive), and this step changes the control signal SCTRLOf (e.g., 00011 → 00111 or 00111 → 00011).
Step S720: performing a comparison operation to compare the signal S derived from the output signalOUTA current value of (e.g. the digital feedback signal S described later)FEEDBACK) And is derived from the output signal SOUTA previous value of (e.g., a previous digital feedback signal, described below). The current value is generated from the control signal SCTRLAfter the last change, the previous value is generated from the control signal SCTRLBefore the last change.
Step S730: if the current value is less than the previous value (which means that the boosted signal is smaller, i.e. the AM-PM distortion is reduced), keeping the current direction unchanged; if the current value is greater than the previous value (which means the proliferated signal becomes large, i.e., AM-PM distortion becomes severe), the current direction is updated to the reverse of the current direction.
Step S740: repeating steps S710-S740 in sequence until the current direction changes at least N times, and then outputting the correction signal SCALTo indicate the presence of the input signal SINThe control signal S is the specific valueCTRLWherein N is a positive integer. For example, if the current value is smaller than the previous value when the first comparison operation is performed, which indicates that the change direction of the initially selected control signal is correct, N is a positive integer; if the current value is larger than the previous value when the first comparison operation is executed, which indicates that the change direction of the initially selected control signal is wrong, the N is a positive integer not smaller than 2.
Through the above steps, the correction circuit 610 can find the input signal SINThe control corresponding to each value ofSignal SCTRLThe optimum intensity or the optimum level.
FIG. 8 shows an embodiment of the calibration circuit 610 of FIG. 6. As shown in fig. 8, the calibration circuit 610 includes a self-mixing mixer (self-mixing mixer)810 and an adaptive calibration circuit 820. The self-mixing mixer 810 outputs the signal S according to the output signalOUTOr its derivative signal to generate a mixing signal SMIXWherein the output signal SOUTOr its derivative signal as a mixing input signal SMIX_INAnd a mixer oscillation signal SMIX_LOFor the self-mixing mixer 810 to generate the mixing signal SMIXThe mixing signal SMIXIncluding a growing signal (e.g. frequency 2 f)BBWherein f isBBFor the input signal SINFrequency of (d). The adaptive calibration circuit 820 is based on the control signal SCTRLWith the mixing signal SMIXIs used to output the correction signal SCALTo the control circuit 120. For example, when the control signal SCTRLIncreased by a predetermined unit if it is derived from the mixing signal SMIXIs less than the current value stored in the adaptive calibration circuit 820 derived from the mixed signal SMIXA previous value of (which is generated from the control signal S)CTRLBefore change), the adaptive calibration circuit 820 outputs the correction signal SCALSo that the control signal S outputted by the control circuit 120CTRLThen increasing the number of the cells by a preset unit; if the current value is greater than the previous value, the adaptive calibration circuit 820 outputs the calibration signal SCALSo that the control signal S outputted by the control circuit 120CTRLDecreasing by a predetermined unit. Notably, for the output signal SOUTIs sized to be processed by the calibration circuit 610. the calibration circuit 610 may optionally include a resistor (e.g., an adjustable resistor) (not shown) that is based on the output signal SOUTOutputting a voltage-reducing signal as the output signal SOUTFor the self-mixing mixer 810 to generate the mixing signal S according to the step-down signalMIX。
Fig. 9a shows an embodiment of the self-mixing mixer 810 of fig. 8, wherein the dashed lines represent parasitic capacitances. Since the components shown in fig. 9a are prior art components, the operation of the self-mixing mixer 810 can be understood by those skilled in the art from fig. 9a, and the details thereof are omitted here.
FIG. 9b illustrates an embodiment of the adaptive calibration circuit 820 of FIG. 8. As shown in FIG. 9b, the adaptive calibration circuit 820 includes a gain controller 910, an analog-to-digital converter (ADC)920, and a compare and calibration circuit 930. A gain controller (e.g., a Variable Gain Amplifier (VGA)) based on the mixing signal SMIXGenerating a gain control signal SGAIN. ADC 920 according to the gain control signal SGAINGenerating a digital feedback signal SFEEDBACK. The compare and calibrate circuit 930 compares the digital feedback signal SFEEDBACKAnd a preceding digital feedback signal (i.e., a previously generated digital feedback signal S)FEEDBACK) To determine and output the calibration signal SCAL(ii) a Upon completion of the comparison of the digital feedback signal SFEEDBACKAnd the prior digital feedback signal, the compare and calibrate circuit 930 compares the digital feedback signal SFEEDBACKAs the prior digital feedback signal for the next round of comparison; in one exemplary embodiment, the compare and calibrate circuit 930 is configured to perform the steps of FIG. 7.
Fig. 10 shows another embodiment of the apparatus for compensating for am and pm distortion of the present invention. The apparatus 1000 for compensating AM/PM distortion of FIG. 10 comprises a receiving circuit 1010 (e.g., coincidence correlation circuit)
A wireless receiving circuit of the 802.11a/b/g/n/ac specification, a bluetooth receiving circuit, a NarrowBand Internet of Things (NBIOT) receiving circuit, etc.), and a control circuit 1020 (for example: control circuit 120 of fig. 4). The receiver circuit 1010 includes an input circuit 1012, a phase shift adjustment circuit 1014 (e.g., an adjustable capacitor), and a radio-to-baseband receiver circuit 1016. The input circuit 1012 (e.g., an adjustable resistor or a pin) is based on a RF signal SRFGenerating an analog received signal SRF_A. The phase shift adjusting circuit 1014 is coupled to the input circuit 1012 and is configured to adjust the phase shift according to a control signal SCTRLAdjusting an analog received signal SRF_AThe phase shift of (2). The RF-to-baseband receiving circuit 1016 receives the analog receiving signal SRF_AGenerating a digital received signal SBB. The control circuit 1020 receives the signal S according to the digital signalBBGenerating the control signal SCTRLThe control signal SCTRLFollowing the digital received signal SBBAnd so on.
Fig. 11 shows an embodiment of the rf-to-baseband receiving circuit 1016 of fig. 10. The rf-to-baseband receiving circuit 1016 of fig. 11 includes: a mixer 1110 for receiving the analog receiving signal SRF_AGenerating an intermediate frequency signal SIF. A gain controller 1120 (e.g., a variable gain amplifier) according to the IF signal SIFGenerating a gain control signal SGAIN(ii) a And an analog-to-digital converter (ADC)1130 according to the gain control signal SGAINGenerating the digital receiving signal SBB。
Fig. 12 shows another embodiment of the apparatus for compensating for am and pm distortion of the present invention. Compared to FIG. 10, the apparatus 1200 for compensating AM/PM distortion of FIG. 12 further comprises a calibration circuit 1210 (e.g., the comparing and calibrating circuit 930 of FIG. 9 b). The calibration circuit 1210 receives the digital signal SBBAnd the control signal SCTRLOutputs a correction signal SCALTo the control circuit 1020, so that the control circuit 1020 can be used to control the calibration circuit according to the calibration signal SCALDetermining the digital received signal SBBAnd the control signal SCTRLThe relationship between them. In one exemplary implementation, the calibration circuit 1210 performs the steps of FIG. 7 except for the input signal SINFrom the radio-frequency signal SRFReplacing the input signal SINIs determined by the radio frequency signal SRFAnd the output signal SOUTFrom the digital received signal SBBAnd (4) substitution.
Since the implementation details and variations of the embodiments of fig. 10-12 can be understood by those skilled in the art with reference to the disclosure of the embodiments of fig. 1-9 b, the overlapping and redundant description is omitted here.
In summary, compared with the prior art, the amplitude modulation and phase modulation distortion compensation device of the invention has the advantages of easy implementation, low cost, low power consumption and the like.
Although the embodiments of the present invention have been described above, the embodiments are not intended to limit the present invention, and those skilled in the art can make variations on the technical features of the present invention according to the explicit or implicit contents of the present invention, and all such variations may fall within the scope of the patent protection sought by the present invention.
Claims (10)
1. An apparatus for compensating for amplitude modulation and phase modulation distortion, comprising:
a transmission circuit, comprising:
an amplifying circuit for outputting an amplified signal according to an input signal;
the phase shift adjusting circuit is arranged between the amplifying circuit and an output circuit and is used for adjusting the phase shift of the amplifying signal according to a control signal; and
the output circuit is used for outputting an output signal according to the amplified signal; and
a control circuit for generating the control signal according to the input signal, wherein the control signal is varied with the input signal.
2. The apparatus according to claim 1, wherein the transmitting circuit is a wireless signal transmitting circuit, the input signal comprises an in-phase signal and a quadrature-phase signal, the amplified signals comprise a first amplified signal and a second amplified signal, the control signal comprises a first control signal and a second control signal, the output signal comprises a first output signal and a second output signal, the amplifying circuit comprises:
an oscillation source for providing at least one first oscillation signal and at least one second oscillation signal;
a first digital-to-radio frequency amplitude converter for converting the in-phase signal into the first amplified signal according to the at least one first oscillation signal; and
a second digital-to-radio frequency amplitude converter for converting the quadrature-phase signal into the second amplified signal according to the at least one second oscillating signal;
the phase shift adjusting circuit comprises:
a first resonant circuit for adjusting the phase shift of the first amplified signal according to the first control signal; and
a second resonant circuit for adjusting the phase shift of the second amplified signal according to the second control signal; and
the output circuit includes a signal combiner for summing the first amplified signal and the second amplified signal to generate the output signal.
3. The apparatus according to claim 1, wherein the transmission circuit is an audio transmission circuit, the input signal is a digital audio signal, and the amplifying circuit comprises:
a digital-to-analog converter for generating an analog audio signal according to the digital audio signal; and
an audio amplifier for generating the amplified signal according to the analog audio signal; and
the output circuit comprises an output pin for outputting the output signal according to the amplified signal.
4. The apparatus for compensating for amplitude modulation distortion according to claim 1, wherein the control circuit comprises:
a control signal generating circuit for determining the intensity or level composition of the control signal according to the amplitude of the input signal and outputting the control signal to the phase shift adjusting circuit.
5. The apparatus for compensating for AM/PM distortion of claim 4, wherein said control signal generating circuit comprises:
a table look-up circuit for outputting a digital control signal according to the amplitude of the input signal; and
and the digital-to-analog converter is used for generating an analog signal according to the digital control signal, wherein the analog signal or a filtering signal of the analog signal is used as the control signal.
6. The apparatus according to claim 1, further comprising a calibration circuit for outputting a calibration signal to the control circuit according to a relationship between a variation of the control signal and a variation of the output signal, so that the control circuit determines a relationship between the input signal and the control signal according to the calibration signal, the calibration circuit comprising:
a self-mixing mixer for generating a mixing signal according to the output signal or a derivative signal thereof; and
an adaptive calibration circuit for outputting the calibration signal to the control circuit according to the relationship between the variation of the control signal and the variation of the mixing signal.
7. The apparatus for compensating for amplitude modulation distortion according to claim 6, wherein the adaptive calibration circuit comprises:
a gain controller for generating a gain control signal according to the mixing signal;
an analog-to-digital converter for generating a digital feedback signal according to the gain control signal; and
a comparison and calibration circuit for comparing the digital feedback signal with a previous digital feedback signal to determine and output the calibration signal.
8. An apparatus for compensating for amplitude modulation and phase modulation distortion, comprising:
a receiving circuit, comprising:
an input circuit for generating an analog receiving signal according to a radio frequency signal;
a phase shift adjusting circuit coupled to the input circuit for adjusting the phase shift of the analog receiving signal according to a control signal; and
a radio frequency to base frequency receiving circuit for generating a digital receiving signal according to the analog receiving signal; and
a control circuit for generating the control signal according to the digital receiving signal, wherein the control signal is varied with the digital receiving signal.
9. The apparatus for compensating AM/PM distortion of claim 8, wherein the RF-to-baseband receiving circuit comprises:
a mixer for generating an intermediate frequency signal according to the analog received signal;
a gain controller for generating a gain control signal according to the intermediate frequency signal; and
an analog-to-digital converter for generating the digital receiving signal according to the gain control signal.
10. The apparatus for compensating for amplitude modulation distortion according to claim 8, wherein the control circuit comprises:
a control signal generating circuit for determining the strength or level composition of the control signal according to the amplitude of the digital receiving signal and outputting the control signal to the phase shift adjusting circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112134584A (en) * | 2020-08-11 | 2020-12-25 | 南京英锐创电子科技有限公司 | Automatic mismatch calibration circuit and method and radio frequency receiver |
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| Publication number | Publication date |
|---|---|
| CN111355503B (en) | 2022-02-25 |
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