Method, device and system for eliminating DC disadjustment in wireless receiving system

Abstract

The invention provides a method, a device and a system of removing DC offset in a wireless receiving system. The invention mainly includes that: firstly, a single end signal or a differential signal which needs to remove the DC offset is introduced into a high pass filter; then, when the signal which needs to remove the DC offset is the single end signal, the high pass filter filters the signal by using a group of different corner frequencies from high to low in sequence; when the signal which needs to remove the DC offset is the differential signal, the high pass filter filters the signal byusing a group of different corner frequencies from high to low in sequence; when the high pass filter is switched from a subminimal corner frequency to a minimal corner frequency, the output of the high pass filter is regulated through a complementary signal of a control signal of the switching process controlling a transistor, finally, a signal without the DC offset is received. Because the invention adopts a corresponding method of removing the DC impact offset against the differential signal to be processed, the invention can effectively remove the DC impact offset in the differential signal.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an implementation scheme for eliminating DC imbalance in a wireless receiving system. Background technique [0002] With the rapid development of integrated circuit technology, it is possible to highly integrate the wireless transceiver system. Moreover, a wireless transceiver with a direct conversion structure (or called a zero-IF wireless transceiver) has become a mainstream and an inevitable choice in the design of integrated circuits for transceiver systems. However, the most important problem encountered in the design of zero-IF wireless transceiver is the problem of DC offset. [0003] The DC offset refers to the introduction of a DC component due to the influence of noise, self-mixing phenomenon or the mismatch of the receiver itself. The introduction of the DC component will cause a difference between the received signal and the expected received signal. ...

AI Technical Summary

Problems solved by technology

Among them, the digital calibration method requires relatively high-performance analog circuits and complex digital signal processing algorithms, so it is difficult to implement and the cost is high

In order not to affect the frequency spectrum of the signal as much as possible, the existing AC coupling and feedback calibration methods use a lower corner frequency to filter the received frequency signal; the signal response time is longer due to the lower corner frequency , therefore, it cannot meet the requirements of some high-performance communication system standards, thereby affecting the performance of the communication system

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