A Broadband Bidirectional RF Amplifier Based on CMOS Technology

Abstract

A broadband bidirectional radio frequency amplifier based on CMOS technology can overcome the shortcomings of traditional bidirectional radio frequency amplifiers based on single pole double throw switch structure, including forward amplifier broadband and reverse amplifier broadband, both forward amplifier broadband and reverse amplifier broadband use band Common source configuration circuit topology of RC negative feedback, the RF input terminal of the forward amplifier broadband and the RF output terminal of the reverse amplifier broadband are connected together, and the RF output terminal of the forward amplifier broadband is connected with the RF input terminal of the reverse amplifier broadband together. The invention is realized based on CMOS technology, has simple circuit structure, can realize forward and reverse amplification, and has high isolation. The circuit structure does not need RF single-pole double-throw switch for switching, which eliminates the noise figure and output power deterioration caused by the loss caused by the switch, and at the same time, the two ports can achieve broadband matching in both forward and reverse working modes.

Description

technical field [0001] The invention relates to a broadband bidirectional radio frequency amplifier circuit, in particular to a broadband bidirectional radio frequency amplifier based on CMOS technology. Background technique [0002] The RF amplifier circuit is one of the most common circuit units in the wireless transceiver system, and its function is to amplify the RF signal. For example, RF low-noise amplifiers are used to improve the detection ability of wireless transceivers for weak signals, and RF power amplifiers are used to increase the radiation distance of wireless transmitter signals. Most wireless systems need to implement receiving and transmitting functions at the same time, such as uplink and downlink on communication links, receiving links and transmitting links in electronic equipment such as radar. In order to improve system integration, simplify architecture, and reduce costs, bidirectional RF amplifiers are often required in these systems to amplify upl...

AI Technical Summary

Problems solved by technology

[0004] The first is that when working in the forward direction, the SPDT switching loss at the LNA input will increase the noise figure, and the output SPDT switching loss will reduce the LNA output power. From the perspective of the entire receiving chain, the two SPDT switches will make the LNA gain Reduce 2-3dB

[0005] The second is that when working in reverse, the PA output single-pole double-throw switch loss will reduce the PA output power. From the perspective of the entire transmission chain, two single-pole double-throw switches will reduce the PA gain by 2-3dB

[0006] Third, in the CMOS process, the linearity of the single-pole double-throw switch is not high. When the output power of the PA is large, the switch limits the output power of the circuit.

[0007] The fourth is that since the input and output have single-pole double-throw switch circuits, the layout area of ​​the chip is relatively large, which increases the cost of the chip

Images