Receiver automatic gain control system and method considering a plurality of application scenes

Abstract

The invention discloses a receiver automatic gain control system and method considering a plurality of application scenes. The control system comprises a PCB radio frequency front end matching module FEM, a low noise amplifier LNA, two receiver mixer RMX, two transimpedance amplifiers TIA, two low pass filters LPF, two variable gain amplifiers VGA, two analog-digital converters ADC, a receiver signal power indicator RSI, a power detector PDET and an automatic gain control module. By adoption of the receiver automatic gain control system and method considering a plurality of application scenes provided by the invention, the AGC algorithm of the receiver does not need to sacrifice the performance of the normal mode for optimizing the tolerance to strong interference. The AGC algorithm only increases a detection circuit to switch the circuit from the normal mode to the strong interference mode, and can automatically return to the normal mode after the interference is eliminated.

Description

technical field [0001] The invention belongs to the technical field of communications, and relates to a radio frequency transceiver, in particular to a receiver automatic gain control system that takes into account multiple application scenarios, and also relates to a receiver automatic gain control method that takes into account multiple application scenarios. Background technique [0002] With the rapid development of modern communication systems, the design of RF transceiver chips needs to adapt to more and more complex and changeable environments and various application scenarios, which brings more and more challenges to the design of RF chips, such as how to take both Optimize the receiving sensitivity in low-noise environment, and the normal transmission and demodulation of data in the adjacent channel, next adjacent channel, and other unknown strong interference signal environment. [0003] Among the many design difficulties of the transceiver chip, one of them is how...

AI Technical Summary

Problems solved by technology

But the disadvantages are: 1) In order to ensure that the output of each gain module will not be saturated, it is necessary to place a peak detection module behind each gain module

This not only increases the chip area and power consumption, but also has more interfaces between the RF front-end, the baseband and the AGC control module, and the number of interfaces is often very precious in actual systems, such as the RF front-end and the baseband are separate chips; 2) In order to improve the signal transmission efficiency, this method needs to quickly complete the judgment and gain judgment in the limited preamble stage of the modulation packet, and the delay requirement of the entire AGC system is relatively high; 3) because of the limitation of AGC time, and it needs to process multiple Feedback signal, the algorithm needs to prepare multiple sets of application solutions to optimize and reduce the AGC time as much as possible, which is more complicated

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