Programmable Gain Amplifier Circuit and Programmable Gain Amplifier

Abstract

The invention provides a programmable gain amplification circuit and a programmable gain amplifier. The programmable gain amplification circuit is of a symmetrical fully-differential circuit structure and comprises two differential branch circuits of the same structure, each differential branch circuit respectively comprises a differential input stage connected with a common source structure of a signal input end and a differential output stage connected with a common source structure of a signal output end, and a switching capacitor array is connected between the differential input stage and the differential output stage and connected with a feedback resistor to form a closed loop feedback circuit. The differential input stage of one differential branch circuit is connected with the differential input stage of the other differential branch circuit through a switching resistor array to form a source degeneracy structure. The programmable gain amplifier comprises a plurality of programmable gain amplification circuits connected through an alternating current coupling mode and an output buffer stage applied to a receiving end. The programmable gain amplifier can provide a large gain regulation range and can meet requirements of linearity and bandwidth.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, and more specifically relates to a programmable gain amplifier circuit and a programmable gain amplifier. Background technique [0002] With the development of communication technology, wireless communication has entered the era of high-speed data transmission, wider frequency band will effectively improve the efficiency of data transmission, so ultra-wideband communication technology has become the focus of research in wireless communication systems. [0003] The receiver in the wireless communication system is a device that works at the destination end of the communication link to receive the signal and process or convert it for local use. In the communication system, the received signal is demodulated through the radio frequency front end of the receiver. The radio frequency front-end generally includes basic components such as a programmable gain amplifier, a filter, or a ba...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides an amplifier circuit and an amplifier applied to the receiving end of a communication system to solve the problem that the gain adjustment range of the amplifier in the communication system is small and cannot simultaneously satisfy high bandwidth, high gain and high linearity

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