DC offset compensation system and method

Abstract

The invention discloses a DC offset compensation system, comprising: a signal processing circuit, a first compensation module, a second compensation module and a third compensation module. The first compensation module is configured to compensate a DC offset of a second sub-processing circuit in the signal processing circuit, so that a first DC offset value output by the signal processing circuitis less than or equal to a first threshold; the second compensation module is configured to compensate the DC offset of a first sub-processing circuit based on the first DC offset value, so that a second DC offset value output by the signal processing circuit is less than or equal to a second threshold; and the third compensation module is configured to compensate the DC offset of the signal processing circuit based on the second DC offset value, so that a third DC offset value output by the signal processing circuit is less than or equal to a third threshold. The invention further discloses aDC offset compensation method.

Description

technical field [0001] The invention relates to receiver technology of wireless communication, in particular to a direct current offset compensation system and method. Background technique [0002] In recent years, wireless communication technology has developed rapidly, and devices with wireless communication functions, such as smart phones, tablet computers, and notebook computers, have become more and more widely used, which greatly facilitates people's daily work and life. People's demand for the portability of wireless devices makes low power consumption and high integration become more and more important in the design of wireless transceivers; and in wireless transceivers, the design of the receiver is often the key. [0003] Among common wireless receiver structures, zero-IF receivers have great advantages in low power consumption and high integration, and are very suitable for application in today's wireless devices. However, since the IF signal of the zero-IF recei...

AI Technical Summary

Problems solved by technology

Because the AC coupling technology is difficult to apply in the zero-IF receiver, the circuit of the analog negative feedback scheme in the DC negative feedback is complex and the stability is poor, and the circuit of the digital negative feedback scheme in the DC negative feedback is simple; therefore, the zero-IF receiver Usually a digital negative feedback scheme is used to compensate the DC offset

However, the digital negative feedback scheme will be limited by the performance of the DC offset compensation system when compensating the DC offset, resulting in low compensation accuracy

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