Receiver fast automatic gain control system and control method

Abstract

The invention discloses a receiver fast automatic gain control system and control method. The system comprises a radio frequency automatic gain control circuit and an intermediate frequency automatic gain control circuit; the radio frequency automatic gain control circuit comprises a radio frequency detector connected with a receiver, the output end of the radio frequency detector is connected with the input end of a radio frequency controller, and the output end of the radio frequency controller is connected with the receiver; the intermediate frequency automatic gain control circuit comprises an interference detector and a useful signal detector which are connected with the receiver, the output end of the interference detector and the output end of the useful signal detector are connected with the output end of an intermediate frequency controller respectively, the output end of the intermediate frequency controller is connected with the receiver, and the input end of the intermediate frequency controller is further connected with the output end of the radio frequency controller. The invention further discloses a control method of the system; the receiver fast automatic gain control system and control method can enable zero intermediate frequency receivers and sliding intermediate frequency receivers to finish gain control rapidly in a short lead code 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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