A receiver fast automatic gain control system and control method

Abstract

A fast automatic gain control system and control method for a receiver, the system includes a radio frequency automatic gain control circuit and an intermediate frequency automatic gain control circuit; the radio frequency automatic gain control circuit includes a radio frequency detector connected to the receiver, the output terminal of the radio frequency detector is connected to the The input terminal of the radio frequency controller is connected, and the output terminal of the radio frequency controller is connected with the receiver; the intermediate frequency automatic gain control circuit includes an interference detector and a useful signal detector connected to the receiver, an output terminal of the interference detector and a useful signal detector The output ends of the intermediate frequency controller are respectively connected with the input ends of the intermediate frequency controller, the output end of the intermediate frequency controller is connected with the receiver, and the input end of the intermediate frequency controller is also connected with the output end of the radio frequency controller; the invention also discloses the control method of the system ; The present invention enables zero-IF and sliding-IF receivers to quickly complete gain control within a shorter preamble time.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuit design of microelectronics and solid-state electronics, and relates to a fast automatic gain control system and a control method of a receiver. Background technique [0002] In recent years, the rapid development of wireless communication technology has greatly promoted the progress of society. Devices such as smartphones, smart bracelets, and smart watches have become or are becoming an integral part of people's daily lives. While this type of electronic device provides a variety of functions, there are still some problems that need to be solved urgently, the most challenging of which is battery life. Limited by the size of electronic devices, the capacity of batteries is often strictly limited, so it is very important to reduce the power consumption of electronic devices. [0003] The wireless receiver is a key part of the above-mentioned electronic equipment to realize the wi...

AI Technical Summary

Problems solved by technology

It is precisely because the IF circuit of the zero-IF and sliding IF receivers works in the baseband, the fluctuation of the IF signal is relatively slow, and the time for the traditional automatic gain control circuit to detect the signal strength has to be multiplied, which leads to the failure of the entire automatic gain control. The process speed is greatly reduced

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