Direct-current offset calibration method and device

Abstract

The invention discloses a DCOC (direct-current offset calibration) method. After a receiver is electrified, digital signals of offset voltage of a circuit output port in the receiver are acquired, digital control signals controlling a DCOC output stage are acquired through the digital signals, and current is outputted to a corresponding circuit of the receiver by the DCOC output stage according to the digital control signals. The invention further discloses a direct-current offset calibration device.

Description

technical field [0001] The invention relates to receiver technology, in particular to a method and device for eliminating direct current mismatch. Background technique [0002] In the receiver, since the receiver needs to amplify the received weak signal, the gain of the receiver is very high, usually reaching 60dB-80dB. High-gain circuits usually have a large DC mismatch due to circuit mismatch, which is the case for receivers. The DC mismatch of the receiver will cause the circuit of the receiver to enter an abnormal working state, which will affect the performance of the circuit, and even the function, such as the EVM and gain of the receiver, etc. DC mismatch cancellation (DCOC) is designed to solve this problem produced. [0003] There are many ways to implement DCOC, such as input mismatch storage, output mismatch storage, pre-amplification, negative feedback loop, etc. Each of the above elimination methods can achieve mismatch elimination, but they are all based on...

AI Technical Summary

Problems solved by technology

Each of the above elimination methods can achieve mismatch elimination, but they are all based on dynamic calibration, which has the problem of slow calibration convergence and is not very suitable for receiver applications.

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