CN115276676A - Transmitter circuit, compensation value correction device, and in-phase and quadrature imbalance compensation value correction method - Google Patents
Transmitter circuit, compensation value correction device, and in-phase and quadrature imbalance compensation value correction method Download PDFInfo
- Publication number
- CN115276676A CN115276676A CN202110477637.XA CN202110477637A CN115276676A CN 115276676 A CN115276676 A CN 115276676A CN 202110477637 A CN202110477637 A CN 202110477637A CN 115276676 A CN115276676 A CN 115276676A
- Authority
- CN
- China
- Prior art keywords
- compensation
- compensation value
- values
- compensation values
- characteristic curve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012937 correction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 44
- 238000012360 testing method Methods 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 description 11
- 230000010355 oscillation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012887 quadratic function Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012889 quartic function Methods 0.000 description 1
Images
Classifications
-
- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
Abstract
The application discloses a transmitter circuit, a compensation value correction device and an in-phase and quadrature imbalance compensation value correction method. The at least one sending signal processing device is used for sequentially generating a plurality of output signals according to a plurality of input signals. The compensation device is used for generating an input signal according to a plurality of initial compensation values in sequence. The compensation value correcting device is coupled to an output end and used for receiving the output signals in sequence as a plurality of feedback signals and executing a correcting operation according to the feedback signals. The compensation value calibration device comprises a digital signal processor, which is coupled to the compensation device, and during the calibration operation, the digital signal processor determines a first characteristic curve according to the initial compensation value and the energy of the feedback signal at a predetermined frequency, determines a first compensation value corresponding to the minimum energy according to the first characteristic curve, and provides the first compensation value to the compensation device.
Description
Technical Field
The present invention relates to a method for correcting In-phase and Quadrature (IQ) imbalance compensation values and a transmitter circuit applying the same.
Background
The design of a Zero Intermediate Frequency (Zero-IF) transmitter or Zero Intermediate Frequency receiver has performance limitations of IQ imbalance due to the use of only one mixing stage to convert the baseband signal to radio Frequency, or only one mixing stage to directly convert the received radio Frequency signal to baseband signal. The IQ imbalance is formed because when the in-phase channel and the quadrature channel have different responses, the two signals passing through the in-phase channel and the quadrature channel have unequal amplitude or phase gains.
In order to solve the IQ imbalance problem in the zero if transmitter or the zero if receiver, a method for effectively correcting the IQ imbalance compensation value is needed.
Disclosure of Invention
An objective of the present invention is to solve the IQ mismatch problem in the zero-if transmitter or the zero-if receiver by effectively correcting the IQ mismatch compensation value.
According to an embodiment of the present invention, a transmitter circuit includes at least one transmission signal processing device, a compensation device, and a compensation value correction device. The at least one sending signal processing device is used for sequentially generating a plurality of output signals according to a plurality of input signals. The compensation device is used for generating an input signal according to a plurality of initial compensation values in sequence. The compensation value correcting device is coupled to an output end of the at least one sending signal processing device and used for receiving the output signals from the output end in sequence as a plurality of feedback signals and executing a correcting operation according to the feedback signals. The compensation value calibration device comprises a digital signal processor, which is coupled to the compensation device, and during the calibration operation, the digital signal processor determines a first characteristic curve according to the initial compensation value and the energy of the feedback signal at a predetermined frequency, determines a first compensation value corresponding to the minimum energy according to the first characteristic curve, and provides the first compensation value to the compensation device.
According to another embodiment of the present invention, an offset correction apparatus for correcting one or more offsets used by a compensation apparatus of a transmitter comprises: a fast Fourier transform device and a digital signal processor. The fast fourier transform device is used for performing fast fourier transform on a plurality of feedback signals received from the transmitter, wherein the feedback signals correspond to a plurality of initial compensation values. The digital signal processor is coupled to the fast Fourier transform device and the compensation device, and is used for determining a first characteristic curve according to the initial compensation value and the energy of the feedback signal at a given frequency in a correction operation, determining a first compensation value corresponding to the minimum energy according to the first characteristic curve, and providing the first compensation value and a plurality of first reference compensation values to the compensation device. After receiving the feedback signal corresponding to the first compensation value and the first reference compensation value from the transmitter, the dsp further determines a second characteristic curve according to the first reference compensation value and the energy of the feedback signal at the predetermined frequency, determines a second compensation value corresponding to the minimum energy according to the second characteristic curve, and provides the second compensation value to the compensation device.
According to another embodiment of the present invention, a method for correcting in-phase and quadrature imbalance compensation values includes: (A) Obtaining a plurality of output signals generated by a transmitter according to a test signal and a plurality of compensation values as a plurality of feedback signals; (B) Determining a characteristic curve according to the compensation value and the energy of the feedback signal at a predetermined frequency, and determining a compensation value corresponding to the minimum energy according to the characteristic curve; and (C) generating a plurality of compensation values according to the compensation values determined in step (B), providing the compensation values to the transmitter, and repeating steps (A) and (B), wherein step (C) is repeated until the minimum energy satisfies a predetermined condition.
Drawings
Fig. 1 shows a transmitter circuit according to an embodiment of the invention.
Fig. 2 shows an example of a spectrum of a radio frequency signal.
Fig. 3 shows an example of the frequency spectrum of the feedback signal.
Fig. 4 shows an example of a characteristic curve determined according to the energy of the feedback signal at a predetermined frequency and the corresponding compensation value according to an embodiment of the invention.
Fig. 5 shows another example of a frequency spectrum of the feedback signal.
Fig. 6 shows another exemplary characteristic curve determined according to the energy of the feedback signal at the predetermined frequency and the corresponding compensation value according to an embodiment of the invention.
Fig. 7 shows yet another example of a frequency spectrum of the feedback signal.
Fig. 8 is a flowchart illustrating a method for correcting in-phase and quadrature imbalance compensation values according to an embodiment of the invention.
[ description of symbols ]
100 transmitter circuit
Transmit signal processing path 110
Feedback signal processing path 120
111 compensating device
112-1,112-2 digital-to-analog converter
113-1,113-2 filter
114-1,114-2,124: mixer
115 adder
116 buffer circuit
117 power amplifier
121: fast fourier transform device
122 analog-to-digital converter
123 programmable gain amplifier
125 digital signal processor
401,402,601,602 characteristic curve
IQC-1, IQC-2, IQC-3, IQC-4, IQC-5, IQC-6, IQC _Min-1, IQC _Min-2 compensation values
LO: oscillation signal
Sig, img, sigx Img Signal
Detailed Description
Fig. 1 shows a transmitter circuit according to an embodiment of the invention. The transmitter circuit 100 may include a transmit signal processing path 110 and a feedback signal processing path 120. The transmit signal processing path 110 may include a plurality of stages of transmit signal processing devices for processing the transmit signal, e.g., converting a baseband signal to a radio frequency signal. According to an embodiment of the present invention, the transmit signal processing path 110 may include a compensation device 111, digital to Analog converters (DACs) 112-1 and 112-2 on an in-phase channel and a quadrature channel, respectively, filters 113-1 and 113-2, mixers 114-1 and 114-2, and an adder 115 and a buffer circuit 116. The compensation device 111 receives a test signal or an original input signal, and performs IQ imbalance compensation on the received signal according to the IQ compensation value to generate a compensated input signal. The IQ compensation value may be a compensation value for compensating the amplitude and phase of the in-phase channel and the quadrature channel, for example, the compensation device 111 may adjust the amplitude and phase of the received signal according to the IQ compensation value to remove the IQ imbalance on the transmit signal processing path.
The digital-to-analog converters 112-1 and 112-2 are used for converting the compensated input signals from the digital domain to the analog domain on the in-phase channel and the quadrature channel, respectively. The filters 113-1 and 113-2 are used to perform filtering operations on the received signals, respectively. The mixers 114-1 and 114-2 are used to multiply the received signal with an oscillation signal LO to convert the received signal from baseband to rf signal, wherein the oscillation signal LO provided to the mixers 114-1 and 114-2 can be two signals with same frequency and orthogonal phase. The summer 115 is used to combine the signals on the in-phase and quadrature paths. The buffer circuit 116 may be a driving circuit of the power amplifier 117, and is used for buffering the received rf signal and driving the power amplifier 117 of the subsequent stage. The power amplifier 117 is used for amplification of the rf signal before it is transmitted through the antenna.
In an embodiment of the present invention, the feedback signal processing path 120 may include a plurality of feedback signal processing devices, such as a mixer 124, a Programmable Gain Amplifier (PGA) 123, an Analog-to-Digital Converter (ADC) 122, a fast fourier transform device 121, and a Digital signal processor 125. The feedback signal processing path 120 may be coupled to an output of at least one of the transmit signal processing devices, such as the output of the buffer circuit 116, for receiving the output signal generated by the transmit signal processing device from the output as the feedback signal and processing the feedback signal. The mixer 124 multiplies the received feedback signal by itself to down-convert the feedback signal into a baseband signal, and the output signal is subjected to the signal processing of the transmitting signal processing apparatus, including the signal processing on the in-phase channel and the quadrature channel, respectively. The programmable gain amplifier 123 is used to amplify/attenuate the received feedback signal. The analog-to-digital converter 122 is used to convert the feedback signal from the analog domain to the digital domain. The fast fourier transform means 121 performs fast fourier transform on the received feedback signal to generate a feedback signal in the frequency domain. The digital signal processor 125 is coupled to the fast fourier transform device 121 and the compensation device 111, and is configured to perform a correction operation according to the feedback signal in the frequency domain to correct one or more compensation values used by the compensation device 111.
In the embodiment of the present invention, the components in the transmission signal processing path 110, the power amplifier 117 and the antenna as a whole can be regarded as a transmitter, and one or more components in the feedback signal processing path 120 as a whole can be regarded as a compensation value correction device for assisting the correction operation to be performed to correct one or more compensation values used by the compensation device 111 of the transmitter.
According to an embodiment of the invention, the correction operation may include one or more iterations of the operation. At the beginning of the calibration operation, the dsp 125 may first set a plurality of initial compensation values for the compensation apparatus 111 and send the test signal to a receiving end of the transmitter, for example, the receiving end of the compensation apparatus 111. The dsp 125 may slightly increase or decrease an initial compensation value to generate the plurality of different initial compensation values. For example, the initial offset value may be set to 0, and the DSP 125 may slightly increase or decrease the initial offset value to generate a plurality of initial offset values, such as-1, 0, 1. The test signal sent to the transmitter may be a single frequency signal comprising/combining an in-phase component and a quadrature component, or may be two signals of the same frequency and in quadrature phase, e.g. with an angular frequency ωmA pair of cosine signals cos ωmt and the sine signal sin ωmt. It is noted that the present invention is not limited to the means for generating/providing the test signal. For example, the test signal may also be generated by another signal generating device (not shown).
It should be noted that the compensation value may be an amplitude and/or phase compensation value. For example, the initial compensation value may be a set of compensation values including an initial amplitude compensation value and an initial phase compensation value, and the dsp 125 may slightly increase or decrease the initial amplitude compensation value and the initial phase compensation value, respectively, to generate another two sets of initial compensation values with different values. For convenience, the following paragraphs do not intend to distinguish between amplitude compensation values and phase compensation values, and the compensation values described in the following paragraphs may represent a set of compensation values including amplitude compensation values and phase compensation values (but may also be one of amplitude compensation values and phase compensation values), while different compensation values represent different sets of compensation values (or different amplitude/phase compensation values).
Fig. 2 shows an example of a spectrum of an rf signal outputted from the output terminal of the buffer circuit 116. As can be seen from the figure, the original signal Sig is assumed to have an angular frequency of ωmDue to IQ imbalance on the transmit signal processing path, the spectrum of the resulting rf signal is not only at frequency (Lo + ω)m) At a frequency (Lo- ω) including the energy of the original signal Sigm) And also contains the energy of the unwanted image signal Img.
Fig. 3 shows an example of a frequency spectrum of the feedback signal. As can be seen from this example, due to the existence of the image signal Img, the signal Sig × Img generated after the feedback signal is processed by the mixer 124 still has non-negligible energy at a given frequency. According to an embodiment of the present invention, the predetermined frequency is twice the input frequency of the input signal. For example, when the angular frequency of the test signal is ωmAt a predetermined frequency of 2 omega twice the angular frequencym. It is noted that the given frequency may vary depending on the design of the mixer 124. For example, when the mixer 124 is designed to multiply the feedback signal with a signal having another frequency, the predetermined frequency can be adjusted to another value obtained by adding or subtracting the input frequency and the frequency.
In the calibration operation, for example, in the first iteration (iteration), the compensation device 111 may sequentially compensate the amplitude and/or phase of the test signal according to different compensation values to sequentially generate a plurality of compensated signals as the input signals of the next stage. Subsequent devices in the tx signal processing path 110 sequentially perform corresponding processing (e.g., the signal processing described in the previous paragraph including the signal processing on the in-phase and quadrature channels, respectively) according to the received input signal to generate a plurality of output signals corresponding to different compensation values. The offset calibration device is coupled to an output terminal of the at least one transmission signal processing device, and is configured to sequentially receive output signals corresponding to different offsets from the output terminal as a plurality of feedback signals, and to sequentially perform corresponding processing (e.g., the signal processing described in the previous paragraph) according to the feedback signals. After the signal processing is completed, the dsp 125 may obtain energy information of the feedback signals at the predetermined frequency according to the feedback signals of the frequency domains generated by the fft 121, and determine a characteristic curve according to the obtained energies and the corresponding compensation values, for example, in a first iteration, the dsp 125 may obtain a first characteristic curve.
Fig. 4 shows an example of a characteristic curve determined according to the energy of the feedback signal at the predetermined frequency and the corresponding compensation value according to the embodiment of the invention, wherein the compensation value on the horizontal axis is one of the amplitude compensation value and the phase compensation value, and the energy on the vertical axis is the energy of the frequency component of the feedback signal at the predetermined frequency. It should be noted that although fig. 4 shows a two-dimensional curve, the invention is not limited thereto. In the embodiment of the invention, the characteristic curve determined by the dsp 125 according to the feedback signal and the corresponding compensation value may also be a three-dimensional curve, where the X-axis of the three-dimensional curve may be an amplitude compensation value, the Z-axis may be a phase compensation value, and the Y-axis may be the energy of the frequency component at the predetermined frequency.
The compensation value IQC-1 in the figure may be, but is not limited to, the aforementioned initial compensation value set to 0, and the compensation values IQC-2 and IQC-3 may be the other two compensation values generated by adjusting the compensation value IQC-1. The dsp 125 determines a characteristic curve 401 according to the compensation values IQC-1, IQC-2, and IQC-3 and the energy of the frequency components of the feedback signal obtained by applying the three compensation values at a predetermined frequency, finds a compensation value corresponding to the minimum energy of the characteristic curve, and provides the compensation value to the compensation device 111.
According to an embodiment of the present invention, the dsp 125 may determine a characteristic curve 401 describing a relationship between the compensation values and the energy values according to the compensation values IQC-1, IQC-2, and IQC-3 and the corresponding energy values by using curve fitting (curve fitting) or least squares method (least square method), for example, a mathematical equation of the characteristic curve 401, and determine a compensation value corresponding to the minimum energy according to the equation of the characteristic curve 401, for example, in the first iteration, the dsp 125 may determine the first compensation value IQC _ Min-1. In the embodiment of the present invention, the equation corresponding to the characteristic curve may be a Quadratic equation (Quadratic function), a Quartic function (Quadratic function), or any equation with a minimum value (i.e. parabolic opening is upward).
Fig. 5 shows another example of a frequency spectrum of the feedback signal. This example shows the spectrum of the feedback signal resulting from applying the first compensation value. It can be seen from this example that since the first iteration tries to find the compensation value corresponding to the minimum energy, the energy of the signal Sig x Img at a given frequency is significantly reduced after the first compensation value is applied.
Assuming that the curve actually describing the relationship between the compensation value and the energy value completely in the first iteration is the characteristic curve 402, since the first compensation value IQC _ Min-1 does not necessarily correspond to the minimum value of the characteristic curve 402 exactly, as shown by the triangle in fig. 4, the dsp 125 may determine whether to perform the second iteration of the calibration operation, or end the calibration operation. According to an embodiment of the present invention, the dsp 125 may determine whether to perform the second iteration of the calibration operation according to whether a predetermined number of iterations is reached or whether the minimum energy obtained in the current iteration satisfies a predetermined condition (e.g., is less than a threshold).
When the dsp 125 determines that a second iteration of the calibration operation is required, the dsp 125 may provide a plurality of reference compensation values, for example, a plurality of first reference compensation values, to the compensation device 111, wherein the reference compensation values are used to adjust the compensation values obtained in the previous iteration in the next iteration. For example, in the second iteration, the compensation device 111 may utilize the first reference compensation value to fine tune the first compensation value to generate a plurality of compensation values used in the second iteration. It is noted that the present invention is not limited to the plurality of compensation values used in the next iteration being generated by the compensation means 111. In other embodiments of the present invention, the digital signal processor 125 may also generate a plurality of compensation values for the next iteration according to a plurality of reference compensation values and the currently obtained compensation values. In addition, in the embodiments of the present invention, the same set of reference compensation values may be used in different iterations, and different sets of reference compensation values may also be used. For example, in a calibration operation, the reference compensation value used in each iteration may be smaller than the reference compensation value used in the previous iteration.
In the second iteration of the calibration operation, the compensation device 111 sequentially compensates the amplitude and/or phase of the test signal according to different compensation values, so as to sequentially generate a plurality of compensated signals as the input signals of the next stage. Subsequent devices in the tx signal processing path 110 sequentially perform corresponding processing according to the received input signal to generate a plurality of output signals. After the above processing, the compensation value correcting device receives the output signals corresponding to different compensation values in sequence as a plurality of feedback signals, and performs corresponding processing according to the feedback signals in sequence. After the signal processing is completed, the dsp 125 may obtain energy information of the feedback signals at the predetermined frequency according to the feedback signals of the frequency domains generated by the fft 121, determine a second characteristic curve according to the obtained energies and corresponding compensation values (e.g., the first reference compensation value), determine a compensation value corresponding to a minimum energy according to the second characteristic curve, e.g., a second compensation value, and provide the second compensation value to the compensation device 111. For the manner of determining the characteristic curve and determining the compensation value corresponding to the minimum energy, reference may be made to the previous paragraphs, which are not repeated herein.
Fig. 6 shows another exemplary characteristic curve determined according to the energy of the feedback signal at the predetermined frequency and the corresponding compensation value according to the embodiment of the invention, wherein the compensation value on the horizontal axis is one of the amplitude compensation value and the phase compensation value, and the energy on the vertical axis is the energy of the frequency component of the feedback signal at the predetermined frequency. The compensation values IQC-4, IQC-5 and IQC-6 in the figure may be, but are not limited to, a plurality of first reference compensation values used in the second iteration. Assuming that the curve actually describing the relationship between the compensation values and the energy values completely in the second iteration is the characteristic curve 602, the dsp 125 may determine the characteristic curve 601 according to the compensation values IQC-4, IQC-5 and IQC-6 and the energy of the frequency components of the feedback signal obtained by applying the three compensation values at the predetermined frequency, find the compensation value IQC _ Min-2 corresponding to the minimum energy of the characteristic curve, as shown by the star in fig. 6, and provide the compensation value to the compensation device 111.
Similarly, after determining the compensation value corresponding to the minimum energy in the characteristic curve, the dsp 125 may determine whether to perform a next iteration of the calibration operation, or end the calibration operation. When the dsp 125 determines that the calibration operation can be ended, the dsp 125 may no longer update the compensation value provided to the compensation device 111 and cause the compensation device 111 to no longer receive the test signal. The dsp 125 may also control other components in the feedback signal processing path to cease functioning. After the calibration operation is completed, the compensation device 111 receives a general input signal as an original input signal in a subsequent operation, and performs IQ imbalance compensation on the received signal according to a newly obtained compensation value to generate a compensated input signal.
Fig. 7 shows yet another example of a frequency spectrum of a feedback signal. This example shows the spectrum of the feedback signal resulting from applying the second compensation value. It can be seen from this example that the energy of the signal Sig x Img at a given frequency is reduced after two correction iterations compared to the result of fig. 5.
According to an embodiment of the present invention, if more than one iteration is performed in the calibration operation, the dsp 125 or the compensation device 111 may add all the compensation values obtained in the previous iterations to obtain a compensation value sum, and then fine tune the compensation value sum using a plurality of reference compensation values to generate a plurality of compensation values used in the next iteration. Alternatively, after the calibration operation is finished, the compensation device 111 performs IQ imbalance compensation on the received signal number according to the sum of the obtained compensation values in the subsequent transmitter operation to generate a compensated input signal.
Fig. 8 is a flowchart illustrating an in-phase and quadrature imbalance compensation value calibration method according to an embodiment of the present invention, which includes the following steps performed by the compensation value calibration apparatus:
in step S802, a plurality of output signals generated by a transmitter according to a test signal and a plurality of compensation values are obtained as a plurality of feedback signals, wherein the plurality of output signals are generated after the test signal is processed by one or more transmission signal processing devices on a transmission signal processing path 110 having an in-phase channel and a quadrature channel.
Step S804, determining a characteristic curve according to the compensation values and the energy of the corresponding feedback signal at a predetermined frequency, and determining a compensation value corresponding to the minimum energy according to the characteristic curve.
According to an embodiment of the present invention, after the first execution of step S804, the dsp 125 may determine whether to end the calibration operation, for example, whether a predetermined number of iterations is reached or whether the minimum energy satisfies a predetermined condition. If it is determined to end the calibration operation, the compensation value determined in step S804 can be directly provided to the transmitter. If it is determined that the next iteration is to be executed, step S806 may be further executed.
Step S806, generating a plurality of different compensation values according to the compensation values determined in step S804, providing the plurality of compensation values to the transmitter, and re-executing steps S802 and S804. At least one of the compensation values is adjusted (i.e., is a different value than the previous value) each time step S802 is executed again.
According to an embodiment of the present invention, step S806 may be repeatedly performed until a stop condition for ending the calibration operation is satisfied. For example, the dsp 125 may end the calibration operation until the dsp 125 determines that a predetermined number of iterations has been reached or that the minimum energy has satisfied a predetermined condition. After the calibration operation is finished, the transmitter may perform IQ imbalance compensation according to the newly obtained compensation value in a subsequent operation.
It is noted that, in the embodiment of the present invention, when the step S806 is executed, the dsp 125 may generate the plurality of compensation values by fine-tuning the compensation value determined in the step (B), and when the step S804 is executed again, the dsp 125 may determine a characteristic curve according to the plurality of compensation values obtained after the adjustment, or according to a plurality of fine-tuning values used for fine-tuning the compensation value determined in the step (B). If the dsp 125 determines the characteristic curve based on the trim values, then a calibration operation representing an iteration is used to find the best trim value for each iteration. Therefore, when the number of iterations performed in the calibration operation is more than one, the dsp 125 may sum all the compensation values determined in step S804 to obtain a compensation value sum when performing step S806, and then fine tune the compensation value sum by using a plurality of fine tuning values to generate different compensation values for the next iteration. It should be noted that, in other embodiments, the compensation device 111 may also sum all the previously obtained compensation values to obtain a compensation value sum, and fine tune the compensation value sum by using a plurality of fine tuning values to generate different compensation values.
As shown in fig. 3, 5 and 7, by performing the compensation value calibration method of the present invention in the calibration operation, the energy of the image signal Img can be gradually reduced in the calibration operation, so that the IQ imbalance in the transmitter can be effectively eliminated by the compensation device used in the calibration compensation device.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (10)
1. A transmitter circuit, comprising:
at least one sending signal processing device for generating a plurality of output signals according to a plurality of input signals in sequence;
a compensation device for generating the plurality of input signals according to a plurality of initial compensation values in sequence; and
a compensation value calibration device coupled to an output terminal of the at least one transmission signal processing device for receiving the output signals as feedback signals in sequence from the output terminal and performing a calibration operation according to the feedback signals,
wherein the compensation value correcting means includes:
a digital signal processor coupled to the compensation device, wherein in the calibration operation, the digital signal processor determines a first characteristic curve according to the initial compensation values and the energy of the feedback signals at a predetermined frequency, determines a first compensation value corresponding to a minimum energy according to the first characteristic curve, and provides the first compensation value to the compensation device.
2. The transmitter circuit of claim 1, wherein the first compensation value is determined in a first iteration of the calibration operation, and the dsp further provides a plurality of first reference compensation values to the compensation device when the dsp determines that a second iteration of the calibration operation is required.
3. The transmitter circuit of claim 2, wherein after the compensation device sequentially generates the plurality of input signals according to the first compensation value and the plurality of first reference compensation values and after the at least one transmit signal processing device sequentially generates the plurality of output signals according to the plurality of input signals, the dsp further determines a second characteristic curve according to the plurality of first reference compensation values and energy of the plurality of feedback signals corresponding to the plurality of output signals at the predetermined frequency, determines a second compensation value corresponding to a minimum energy according to the second characteristic curve, and provides the second compensation value to the compensation device.
4. The transmitter circuit of claim 1, wherein the plurality of initial compensation values and the first compensation value are amplitude or phase compensation values.
5. The transmitter circuit of claim 2, wherein the plurality of first reference compensation values are used to adjust the value of the first compensation value in the second iteration.
6. An offset correction apparatus for correcting one or more offsets used by a compensation apparatus of a transmitter, comprising:
a fast fourier transform device for performing fast fourier transform on a plurality of feedback signals received from the transmitter, wherein the plurality of feedback signals correspond to a plurality of initial compensation values; and
a digital signal processor, coupled to the fast Fourier transform device and the compensation device, for determining a first characteristic curve according to the initial compensation values and the energy of the feedback signals at a predetermined frequency in a calibration operation, determining a first compensation value corresponding to a minimum energy according to the first characteristic curve, and providing the compensation device with the first compensation value and a plurality of reference compensation values,
wherein after receiving the feedback signals corresponding to the first compensation value and the first reference compensation values from the transmitter, the dsp further determines a second characteristic curve according to the first reference compensation values and the energy of the feedback signals at the predetermined frequency, determines a second compensation value corresponding to a minimum energy according to the second characteristic curve, and provides the second compensation value to the compensation device.
7. The apparatus of claim 6, wherein the initial compensation values, the first compensation value and the second compensation value are amplitude or phase compensation values.
8. The apparatus of claim 6, wherein the plurality of first reference compensation values are used to adjust the value of the first compensation value.
9. An in-phase and quadrature imbalance compensation value correction method, comprising:
(A) Obtaining a plurality of output signals generated by a transmitter according to a test signal and a plurality of compensation values as a plurality of feedback signals;
(B) Determining a characteristic curve according to the compensation values and the energy of the feedback signals at a predetermined frequency, and determining a compensation value corresponding to the minimum energy according to the characteristic curve; and
(C) Generating the plurality of compensation values according to the compensation value determined in step (B), providing the plurality of compensation values to the transmitter, and re-performing steps (A) and (B),
wherein the step (C) is repeatedly performed until the minimum energy satisfies a predetermined condition.
10. The method of claim 9, wherein the compensation values are compensation values for compensating an amplitude or a phase of the test signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110477637.XA CN115276676A (en) | 2021-04-30 | 2021-04-30 | Transmitter circuit, compensation value correction device, and in-phase and quadrature imbalance compensation value correction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110477637.XA CN115276676A (en) | 2021-04-30 | 2021-04-30 | Transmitter circuit, compensation value correction device, and in-phase and quadrature imbalance compensation value correction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115276676A true CN115276676A (en) | 2022-11-01 |
Family
ID=83744733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110477637.XA Pending CN115276676A (en) | 2021-04-30 | 2021-04-30 | Transmitter circuit, compensation value correction device, and in-phase and quadrature imbalance compensation value correction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115276676A (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5677686A (en) * | 1994-01-28 | 1997-10-14 | Mitsubishi Denki Kabushiki Kaisha | Absolute position detection apparatus and error compensation methods therefor |
| US20030045249A1 (en) * | 2001-05-15 | 2003-03-06 | Nielsen Jorgen S. | Feedback compensation detector for a direct conversion transmitter |
| EP1437831A2 (en) * | 2003-01-10 | 2004-07-14 | Matsushita Electric Industrial Co., Ltd. | D/a conversion apparatus with offset compensation function and d/a conversion apparatus offset compensation method |
| CN101272373A (en) * | 2008-05-07 | 2008-09-24 | 北京北方烽火科技有限公司 | Self-adapting analog quadrature modulation disbalance compensation method and device |
| CN101494443A (en) * | 2008-01-23 | 2009-07-29 | 财团法人工业技术研究院 | DC offset correction circuit and method |
| CN101616125A (en) * | 2008-06-26 | 2009-12-30 | 大唐移动通信设备有限公司 | The method that a kind of zero intermediate frequency transmitter and calibration zero intermediate frequency transmit |
| CN101909040A (en) * | 2009-06-04 | 2010-12-08 | 株式会社理光 | Communication device |
| US20120250790A1 (en) * | 2011-04-01 | 2012-10-04 | Texas Instruments Incorporated | Frequency selective iq correction |
| CN105282062A (en) * | 2014-05-30 | 2016-01-27 | 瑞昱半导体股份有限公司 | Correction method for mismatching between signal paths of transmitter/receiver and device thereof |
| US20160173317A1 (en) * | 2014-12-15 | 2016-06-16 | Apple Inc. | Devices and methods for reducing signal distortion in i/q modulation transceivers |
| CN107677976A (en) * | 2017-09-26 | 2018-02-09 | 中国科学院武汉物理与数学研究所 | A kind of self-adaptive kernel magnetic resonance gradient preemphasis Waveform generating apparatus and method |
| CN108156103A (en) * | 2016-12-05 | 2018-06-12 | 中兴通讯股份有限公司 | A kind of I/Q signal calibration method and device |
| CN108270357A (en) * | 2016-12-30 | 2018-07-10 | 比亚迪股份有限公司 | Switching Power Supply and its feedforward compensation circuit |
| CN108347285A (en) * | 2017-12-26 | 2018-07-31 | 三维通信股份有限公司 | A kind of full bandwidth zero-intermediate-frequency transmitter signal correction system and method |
| CN108432140A (en) * | 2015-12-31 | 2018-08-21 | 华为技术有限公司 | A kind of means for correcting and method |
| CN109963161A (en) * | 2017-12-26 | 2019-07-02 | 北京君正集成电路股份有限公司 | Optimal compensation value calculating method and device |
-
2021
- 2021-04-30 CN CN202110477637.XA patent/CN115276676A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5677686A (en) * | 1994-01-28 | 1997-10-14 | Mitsubishi Denki Kabushiki Kaisha | Absolute position detection apparatus and error compensation methods therefor |
| US20030045249A1 (en) * | 2001-05-15 | 2003-03-06 | Nielsen Jorgen S. | Feedback compensation detector for a direct conversion transmitter |
| EP1437831A2 (en) * | 2003-01-10 | 2004-07-14 | Matsushita Electric Industrial Co., Ltd. | D/a conversion apparatus with offset compensation function and d/a conversion apparatus offset compensation method |
| CN101494443A (en) * | 2008-01-23 | 2009-07-29 | 财团法人工业技术研究院 | DC offset correction circuit and method |
| CN101272373A (en) * | 2008-05-07 | 2008-09-24 | 北京北方烽火科技有限公司 | Self-adapting analog quadrature modulation disbalance compensation method and device |
| CN101616125A (en) * | 2008-06-26 | 2009-12-30 | 大唐移动通信设备有限公司 | The method that a kind of zero intermediate frequency transmitter and calibration zero intermediate frequency transmit |
| CN101909040A (en) * | 2009-06-04 | 2010-12-08 | 株式会社理光 | Communication device |
| US20120250790A1 (en) * | 2011-04-01 | 2012-10-04 | Texas Instruments Incorporated | Frequency selective iq correction |
| CN105282062A (en) * | 2014-05-30 | 2016-01-27 | 瑞昱半导体股份有限公司 | Correction method for mismatching between signal paths of transmitter/receiver and device thereof |
| US20160173317A1 (en) * | 2014-12-15 | 2016-06-16 | Apple Inc. | Devices and methods for reducing signal distortion in i/q modulation transceivers |
| CN108432140A (en) * | 2015-12-31 | 2018-08-21 | 华为技术有限公司 | A kind of means for correcting and method |
| CN108156103A (en) * | 2016-12-05 | 2018-06-12 | 中兴通讯股份有限公司 | A kind of I/Q signal calibration method and device |
| CN108270357A (en) * | 2016-12-30 | 2018-07-10 | 比亚迪股份有限公司 | Switching Power Supply and its feedforward compensation circuit |
| CN107677976A (en) * | 2017-09-26 | 2018-02-09 | 中国科学院武汉物理与数学研究所 | A kind of self-adaptive kernel magnetic resonance gradient preemphasis Waveform generating apparatus and method |
| CN108347285A (en) * | 2017-12-26 | 2018-07-31 | 三维通信股份有限公司 | A kind of full bandwidth zero-intermediate-frequency transmitter signal correction system and method |
| CN109963161A (en) * | 2017-12-26 | 2019-07-02 | 北京君正集成电路股份有限公司 | Optimal compensation value calculating method and device |
Non-Patent Citations (1)
| Title |
|---|
| 黄锋;谢运祥;张作伟;: "基于87C196的低压TSC型无功补偿装置", 电子元器件应用, no. 02, 28 February 2007 (2007-02-28) * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI761186B (en) | Transmitter circuit, compensation value calibration device and method for calibrating iq imbalance compensation values | |
| EP1641132B1 (en) | transmitter and transmission method | |
| CN106656902B (en) | Method and apparatus for frequency dependent IQ imbalance compensation | |
| US20090310711A1 (en) | Transmitter and receiver capable of reducing in-phase/quadrature-phase (I/Q) mismatch and an adjusting method thereof | |
| US20150350000A1 (en) | Calibration method and calibration apparatus for calibrating mismatch between first signal path and second signal path of transmitter/receiver | |
| KR20040085962A (en) | Method and apparatus for self-calibrating in a mobile transceiver | |
| JP2006148940A (en) | Inphase/quadrature phase imbalance compensation | |
| US5886584A (en) | Method and apparatus for adjusting modulation accuracy of an orthogonal modulation | |
| JP4941822B2 (en) | Reception device and transmission device | |
| US11764815B2 (en) | Transmitter circuit, compensation value calibration device and method for calibrating compensation values | |
| CN115276676A (en) | Transmitter circuit, compensation value correction device, and in-phase and quadrature imbalance compensation value correction method | |
| TWI645687B (en) | Signal transceiver device and calibration method thereof | |
| TWI806016B (en) | Transceiving device and calibration method thereof | |
| US20240022272A1 (en) | Transmitter circuit, compensation value calibration device and method for calibrating compensation values | |
| TWI783459B (en) | Transmitter circuit, compensation value calibration device and method for calibrating iq imbalance compensation values | |
| CN117526976A (en) | Transmitter circuit, compensation value correction device and compensation value correction method | |
| CN114826845B (en) | IQ imbalance estimation method and device and related equipment | |
| CN115277342A (en) | Transmitter circuit, compensation value correction device, and in-phase and quadrature imbalance compensation value correction method | |
| CN113162704B (en) | Signal calibration method, device and system based on image rejection and electronic equipment | |
| TW202406315A (en) | Transmitter circuit, compensation value calibration device and method for calibrating compensation values | |
| US20240106469A1 (en) | Spurious emissions detection and calibration using envelope detector | |
| CN109412709B (en) | Signal receiving and transmitting device and correction method thereof | |
| CN115037583B (en) | Wireless transceiver with in-phase and quadrature-phase correction function | |
| CN108881079B (en) | I/Q imbalance correction method based on simulated annealing algorithm | |
| CN117792537A (en) | Calibration method and device of receiver and receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |