CN-117526976-B - Transmitter circuit, compensation value correction device and compensation value correction method

CN117526976BCN 117526976 BCN117526976 BCN 117526976BCN-117526976-B

Abstract

The invention relates to a transmitter circuit, a compensation value correction device and a compensation value correction method. A compensation value correction method for correcting one or more compensation values used by a compensation device of a transmitter includes obtaining a plurality of output signals generated by the transmitter processing a set of input signals sequentially according to a plurality of sets of compensation values as a plurality of feedback signals, wherein each feedback signal corresponds to one of the plurality of sets of compensation values, obtaining a signal component of the feedback signal at a given frequency as a portion of the feedback signal, determining a set of imbalance equivalent parameters according to the plurality of sets of compensation values and the portion of the feedback signal in a correction operation, and determining a set of corrected compensation values according to the set of imbalance equivalent parameters, and providing the set of corrected compensation values to the compensation device.

Inventors

ZHANG YUANSHUO
GAO ZIMING

Assignees

瑞昱半导体股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220726

Claims (10)

1. A transmitter circuit comprising: The compensation device is configured on the transmission signal processing path and is used for sequentially processing a group of input signals according to a plurality of groups of compensation values to generate a plurality of groups of compensated signals; at least one transmission signal processing device disposed on the transmission signal processing path for sequentially processing the multiple groups of compensated signals to generate multiple output signals, and A digital signal processor disposed on a feedback signal processing path and coupled to the compensation device, wherein the feedback signal processing path is coupled to an output of the transmit signal processing path, the output signal is provided to the digital signal processor as a plurality of feedback signals through the feedback signal processing path, and the digital signal processor performs a correction operation according to the feedback signals and the plurality of sets of compensation values, In the correction operation, the digital signal processor determines a set of unbalance equivalent parameters according to the plurality of sets of compensation values and the feedback signal, determines a set of corrected compensation values according to the set of unbalance equivalent parameters, and provides the set of corrected compensation values to the compensation device.
2. The transmitter circuit of claim 1 wherein the digital signal processor obtains a portion of the feedback signal that is a signal component of the feedback signal at a given frequency, and the digital signal processor determines the set of imbalance equivalent parameters based on the plurality of sets of compensation values and the portion of the feedback signal.
3. The transmitter circuit of claim 2 wherein the set of input signals is a set of single frequency signals having an input frequency and the absolute value of the given frequency is twice the input frequency.
4. The transmitter circuit of claim 1 wherein after receiving the set of corrected compensation values, the compensation means further processes the subsequently received set of input signals in accordance with the set of corrected compensation values.
5. A compensation value correction device for correcting one or more compensation values used by a compensation device of a transmitter, comprising: fast Fourier transforming means for performing fast Fourier transformation on a plurality of feedback signals received from the transmitter to generate the feedback signals in the frequency domain, wherein each feedback signal corresponds to one of a plurality of sets of compensation values, and A digital signal processor coupled to the FFT device and the compensation device for determining a set of corrected compensation values according to the plurality of sets of compensation values and the feedback signal in the frequency domain during the correction operation and providing the set of corrected compensation values to the compensation device, The digital signal processor obtains a signal component of the feedback signal at a given frequency as a part of the feedback signal according to the feedback signal in a frequency domain, determines a set of imbalance equivalent parameters according to the plurality of sets of compensation values and the part of the feedback signal, and determines the set of corrected compensation values according to the set of imbalance equivalent parameters.
6. The compensation value correcting apparatus according to claim 5, wherein the absolute value of the given frequency is twice the input frequency of the input signal of the transmitter.
7. A compensation value correction apparatus according to claim 5, wherein the set of corrected compensation values is a set of compensation values that cause a processing signal generated by the transmitter in response to an input signal to have a minimum energy at the given frequency.
8. A compensation value correction method for correcting one or more compensation values used by a compensation device of a transmitter, comprising: Obtaining a plurality of output signals generated by the transmitter which sequentially processes a set of input signals according to a plurality of sets of compensation values as a plurality of feedback signals, wherein each feedback signal corresponds to one of the plurality of sets of compensation values; acquiring a signal component of the feedback signal at a given frequency as part of the feedback signal; Determining a set of imbalance equivalent parameters based on the plurality of sets of compensation values and the portion of the feedback signal in a calibration operation, and A set of corrected compensation values is determined based on the set of imbalance equivalent parameters and provided to the compensation device.
9. The compensation value correcting method according to claim 8, wherein the set of input signals is a set of single-frequency signals having an input frequency, and the absolute value of the given frequency is twice the input frequency.
10. The compensation value correction method according to claim 8, further comprising: the set of subsequently received input signals is processed according to the set of corrected compensation values.

Description

Transmitter circuit, compensation value correction device and compensation value correction method Technical Field The invention relates to a compensation value correction method for a transmitter circuit to reduce radio frequency impairments (RF IMPAIRMENT) of the transmitter circuit. Background The design of Zero intermediate frequency (Zero Intermediate Frequency, abbreviated Zero-IF) transmitters or Zero intermediate frequency receivers has performance limitations of IQ imbalance because only one mixing stage is used to convert the baseband signal to radio frequency, or only one mixing stage is used to directly convert the received radio frequency signal to the baseband signal. IQ imbalance is created because when the responses of the in-phase and quadrature channels differ, the two signals passing through the in-phase and quadrature channels will have unequal amplitude or phase gains. In order to solve the IQ imbalance problem in a zero-if transmitter or a zero-if receiver, a method and a corresponding transmitter circuit for effectively correcting the IQ imbalance compensation value are needed. Disclosure of Invention The present invention provides a method and a corresponding transmitter circuit for effectively correcting IQ imbalance compensation values, which can solve IQ imbalance problems in a zero intermediate frequency transmitter or a zero intermediate frequency receiver and find an optimal compensation value in a correction operation more quickly than in the prior art. According to an embodiment of the invention, a transmitter circuit comprises compensation means, at least one transmit signal processing means and a digital signal processor. The compensation device is arranged on the transmission signal processing path and is used for sequentially processing a group of input signals according to a plurality of groups of compensation values to generate a plurality of groups of compensated signals. At least one transmit signal processing device is disposed on the transmit signal processing path for sequentially processing the plurality of sets of compensated signals to generate a plurality of output signals. The digital signal processor is configured on the feedback signal processing path and coupled to the compensation device, wherein the feedback signal processing path is coupled to an output end of the transmission signal processing path, the output signal is provided to the digital signal processor as a plurality of feedback signals through the feedback signal processing path, and the digital signal processor performs a correction operation according to the feedback signals and a plurality of groups of compensation values. In the correction operation, the digital signal processor determines a set of unbalance equivalent parameters according to the plurality of sets of compensation values and the feedback signal, determines a set of corrected compensation values according to the set of unbalance equivalent parameters, and provides the set of corrected compensation values to the compensation device. According to another embodiment of the present invention, a compensation value correction device for correcting one or more compensation values used by a compensation device of a transmitter includes 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 to generate feedback signals in a frequency domain, wherein each feedback signal corresponds to one of a plurality of groups of compensation values. The digital signal processor is coupled to the fast fourier transform device and the compensation device, and is used for determining a set of corrected compensation values according to the sets of compensation values and the feedback signals of the frequency domain in the correction operation, and providing the corrected compensation values to the compensation device. The digital signal processor obtains a signal component of the feedback signal at a given frequency as a part of the feedback signal according to the feedback signal of the frequency domain, determines a set of unbalanced equivalent parameters according to the plurality of sets of compensation values and the part of the feedback signal, and determines the set of corrected compensation values according to the set of unbalanced equivalent parameters. According to yet another embodiment of the present invention, a compensation value correction method for correcting one or more compensation values used by a compensation device of a transmitter includes obtaining a plurality of output signals generated by the transmitter sequentially processing a set of input signals according to a plurality of sets of compensation values as a plurality of feedback signals, wherein each feedback signal corresponds to one of the plurality of sets of compensation values, obtaining a signal component of the fee