Radio frequency power amplifier based on transformer

Abstract

The invention relates to a radio frequency power amplifier based on a transformer, comprising an input transformer, a driving circuit, a power amplification circuit, an impedance matching network and an output transformer that are successively connected; the input end of the input transformer is respectively connected with a single-end radio frequency input (RFIN) signal and the ground; the output end of the input transformer is connected with the input end of the driver circuit; the single-end radio frequency input signal is converted into a differential signal, and the differential signal is output to the driver circuit; the differential signal of the driver circuit is output to the power amplification circuit after being amplified; and the power amplification circuit is in the cascode structure. In the radio frequency power amplifier, devices, such as an inductor, a capacitor, a transformer and the like are integrated on a substrate, impact on the performance of the amplifier by the complementary metal oxide semiconductors (CMOS) technology is effectively avoided on the premise of furthest utilizing the advantages of the CMOS technology, and circuit efficiency is improved; and compared with the traditional totally-integrated radio frequency power amplifier, the radio frequency power amplifier disclosed by the invention has the advantages of higher power and efficiency and more stable performance.

Description

technical field [0001] The invention relates to the technical field of radio frequency power amplifiers, in particular to a transformer-based radio frequency power synthesis technology. Background technique [0002] In order to meet the transmission needs of mobile devices, the RF power amplifier usually needs to reach an output power of several watts. To meet such a large output power, it is usually realized by impedance transformation, power synthesis or a combination of the two. Since the transformer technology can complete the functions of impedance transformation and power synthesis at the same time, it is widely used in the design of radio frequency power amplifiers. [0003] At present, the RF power amplifier technology using transformers is mainly divided into two ways: on-chip integration and off-chip setting. On-chip integration mainly uses CMOS technology or GaAs technology to integrate transformers and other circuits into one chip; off-chip setting mainly uses t...

AI Technical Summary

Problems solved by technology

[0005] The problems to be solved by the present invention are: (1) when the traditional radio frequency power amplifier based on transformer-based power synthesis adopts CMOS technology, the transformer loss is large, the quality factor Q of the amplifier is low, and the performance is unstable; (2) with the increase of power increase, the number and area of ​​transformers increase, the performance decreases instead, and it is not easy to adjust

Images