Microwave receiver front end based on online microelectro mechanical microwave power sensor

Abstract

The invention discloses a microwave receiver front end based on an online microelectro mechanical microwave power sensor. The microwave receiver front end converts partial microwave power coupled by a microelectro mechanical microwave (MEMS) film bridge into a direct current level by using the self test function of the MEMS microwave power sensor; the direct current level controls an attenuate and amplified preprocessor on line; when a microwave antenna receives too large or too small microwave signals, the output of the microwave receiver front keeps stable relatively; meanwhile, when the microwave antenna suddenly receives huge microwave signals, a low noise amplifier is protected, overload is avoided, and a linear dynamic range of the microwave receiver front end is enlarged, so that a complex automatic gain control (AGC) module used in the traditional microwave receiver front end is replaced to realize the function; moreover, the microwave receiver front end is realized based on the MEMS technology, so the microwave receiver front end also has the characteristics of the online MEMS microwave power sensor of low loss, small volume and the like.

Description

technical field [0001] The invention proposes a microwave receiver front end based on an online micro-electro-mechanical microwave power sensor, which belongs to the technical field of micro-electro-mechanical systems (MEMS). Background technique [0002] In wireless communication systems, Automatic Gain Control (AGC) is the most important part of the microwave receiver front end. It mainly includes analog and digital AGC. Generally speaking, the basic function of AGC in the microwave receiver front-end is to control the gain of the low-noise amplifier through closed-loop feedback to keep the output signal level relatively stable when the antenna receives too large or too small microwave signal. However, the microwave receiver front end using traditional AGC technology has many shortcomings, such as limited linear dynamic range, large loss, and the gain control is performed by the inner closed-loop negative feedback of the output signal of the circuit, and the outer closed-...

AI Technical Summary

Problems solved by technology

However, the microwave receiver front end using traditional AGC technology has many shortcomings, such as limited linear dynamic range, large loss, and the gain control is performed by the inner closed-loop negative feedback of the output signal of the circuit, and the outer closed-loop negative feedback uses To avoid signal overload, it is more complicated to implement

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