Radio-frequency power composite circuit

Abstract

A radio frequency (RF) power synthesis circuit which can be used for multi-frequency power signal control and synthesis is disclosed, and it uses impedance converters to reduce voltage across the switches. The circuit comprises: a control circuit; a first switch group (10) which is controlled by the control circuit and connected between transmission ports (TX1-TXN) and a multiplexer (16), thereby forming one or plural transmission frequency bands 1-N; a second switch group (14) which is controlled by the control circuit and connected between reception ports (RX11-RXNK) and the following impedance converter group (12), thereby forming one or plural reception frequency bands 1-N; and the impedance converter group (12) for reducing voltage across the switches in the first switch group (10) and the second switch group (14), which is connected between the second switch group (14) and the multiplexer (16). The circuit uses impedance converters (18) to isolate the large power signal from the switches, thereby effectively improves the capability of voltage breakdown resistance of the switch elements in the circuit and enables application of the CMOS device. The invention thus enables higher integration degree and lower cost of the RF power amplifier chip.

Description

technical field [0001] The invention relates to the technical field of radio-frequency power amplifiers, in particular to a high-integration, low-cost radio-frequency power synthesis circuit using a CMOS process switch. Background technique [0002] The RF power amplifier is an indispensable component in the wireless communication system. It is mainly responsible for amplifying the modulated RF signal to a certain power value and then transmitting it through the antenna. Handheld devices using radio frequency power amplifiers usually require to work in multiple frequency bands, so there are multiple output powers, and general handheld devices are usually equipped with only one antenna component in order to reduce the volume and improve portability, which requires There is a radio frequency power synthesis circuit between the power amplifier and the antenna to control the output power of multiple channels. Since the RF power synthesis circuit is directly connected between th...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of high cost and inability to be highly integrated in the radio frequency power synthesis circuit using GaAs switches in the traditional technology, and the problem that the CMOS switch cannot be applied to the traditional power synthesis circuit due to poor isolation and insufficient resistance to voltage breakdown. problem, and then provide a new type of low-cost and highly integrated RF power combining circuit using CMOS switches

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