Programmable gain amplifier applicable to transmitting end of communication system

Abstract

The invention provides a programmable gain amplifier applicable to a transmitting end of a communication system. The programmable gain amplifier comprises a plurality of programmable gain amplification circuits and an output buffer stage applicable to the transmitting end, wherein every two programmable gain amplification circuits are connected in an alternating current coupling mode, and each programmable gain amplification circuit and the output buffer stage applicable to the transmitting end are also connected in the alternating current coupling mode; a signal output end of each programmable gain amplification circuit is connected with a signal input end of the subsequent programmable gain amplification circuit; and a signal output end of the last programmable gain amplification circuit is connected with a signal input end of the output buffer stage applicable to the transmitting end. By the adoption of the programmable gain amplifier provided by the embodiment of the invention, a larger gain regulating range can be provided, and requirements on linearity and bandwidth can be met.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, and more specifically relates to a programmable gain amplifier applied to the transmitting end of a communication system. 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] A transmitter in a wireless communication system is a device used to transmit a signal at a certain frequency. In the communication system, the radio frequency front end of the transmitter modulates and sends the signal. The RF front-end usually includes basic circuit structures such as a programmable gain amplifier, a filter, or a baseband processing circuit, wherein the programmable gain amplifier is used...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a programmable gain amplifier applied to the transmitting end of a communication system to solve the problem that the existing programmable gain amplifier has a small gain adjustment range and cannot satisfy high bandwidth and high linearity at the same time

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