UWB Dual Gain Control Circuit

Abstract

The invention discloses an ultra-wideband double-gain control circuit, and realizes the ultra-wideband variable-gain double control technology. The ultra-wideband double-gain control circuit comprises an intra-ultra-wideband wide-range gain variation circuit and an intra-ultra-wideband dynamic signal gain variation circuit, and can be used in an ultra-wideband receiving system; the wide-range gain variation of an ultra-wideband variable-gain amplifier and favorable intra-ultra-wideband gain flatness can be realized due to combined action; the intra-ultra-wideband wide-range gain variation circuit provides variable DC bias to a post constant gain amplification unit, so that wide-range gain variation is realized; and the intra-ultra-wideband dynamic signal gain variation circuit serving as a feedback branch of a constant gain amplification circuit provides fine adjustment of gain in a specific band, so that the flatness is improved.

Description

technical field [0001] The invention relates to the field of radio frequency integrated circuits, in particular to a dual gain control circuit applied to an ultra-wideband variable gain amplifier. Background technique [0002] UWB technology is a new type of short-distance high-speed wireless communication technology. With the characteristics of high transmission rate (up to 1Gbit / s), strong anti-multipath ability, low power consumption, low cost, strong penetration ability, and low probability of interception, etc., It has become the preferred technology for short-distance wireless communication, and has important application significance in the fields of personal wireless local area network, radar detection, medical detection and wireless USB. [0003] Due to its large frequency span and wide range, UWB communication systems are prone to crosstalk with other communication systems. Therefore, there are special requirements for the gain and power of UWB wireless communicatio...

AI Technical Summary

Problems solved by technology

[0005] Currently used load variable gain control technology, variable transconductance gain control technology, attenuator-based gain control technology and Gilbert (Gilbert) gain control technology can effectively achieve a wide range of gain control, but they cannot guarantee good performance. Gain flatness; multi-channel selective gain control technology is an effective means to ensure flatness, but it cannot achieve continuous gain change, and it is necessary to design multiple constant gain amplification units, and the circuit structure is more complicated

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