A calibration method and device for direct current mismatch elimination

Abstract

The embodiment of the invention discloses a calibration method and device for a DCOC. The method can comprise the following steps: corresponding to the radio frequency receiver in a calibration state,detecting the direct current offset of the radio frequency receiver at each gain level at the digital output end of the radio frequency receiver; Determining calibration data of the radio frequency receiver at each gain level according to the direct current offset of the radio frequency receiver at each gain level; Determining a target gain level of a current gain value corresponding to the working state of the radio frequency receiver; Determining calibration data corresponding to the target gain value in the calibration data of the radio frequency receiver under each gain level; And generating a corresponding direct current compensation value from the calibration data corresponding to the target gain value, and compensating through an ADC input end of the radio frequency receiver according to the direct current compensation value.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a calibration method and device for direct current mismatch cancellation (DCOC, DCOffset Cancellation). Background technique [0002] In the radio frequency receiver, since the receiver needs to amplify the received weak signal, the receiver needs to have a high gain, which can usually reach 60dB to 80dB, but due to the problems of local oscillator leakage and device mismatch, such a high The higher gain requirements will cause a large DC offset (DC Offset), which will affect the performance of the receiver circuit, and even functions, such as the EVM and gain of the receiver. [0003] In order to eliminate the phenomenon of DC mismatch, schemes such as input mismatch storage, output mismatch storage, pre-amplification, and negative feedback loop are usually used. Although each of the above-mentioned elimination schemes can realize the elimination of DC mi...

AI Technical Summary

Problems solved by technology

These solutions calibrate various gain combinations and store the calibration data so that the DC offset of the receiver meets the requirements under each gain combination. However, these solutions still have high hardware costs and complicated calibration processes. Disadvantages such as long calibration time

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