Three-way doherty power amplifier with improved bandwidth and its realization method

Abstract

The present invention provides a three-way Doherty power amplifier based on a load modulation network to improve bandwidth and its implementation method. The output terminal of the carrier power amplifier circuit is connected to the first impedance converter T1 of 70.7 ohm quarter wavelength, and is connected to the first peak value The power amplifying circuit is connected to the output end of the second peak power amplifying circuit, and the power is output to the load through the combination of the second impedance converter T2 with a quarter wavelength of 40.82 ohms. Compared with the prior art, the present invention reduces the impedance transformation ratio of the load modulation network by improving the load modulation network of the traditional three-way Doherty power amplifier, and adds the compensation line of the peak branch to the peak output matching circuit at the same time, reducing the The quality factor of the overall peak output matching circuit greatly broadens the operating bandwidth of the three-way Doherty power amplifier.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a three-way Doherty power amplifier with improved bandwidth based on a load modulation network and a realization method thereof. Background technique [0002] In the past half a century, radio frequency microwave technology has been developed by leaps and bounds, and is widely used in wireless communication fields such as WLAN, mobile phones, electronic countermeasures, and satellite communications. The RF power amplifier unit is the core component of the wireless communication system. In order to realize long-distance signal transmission and ensure reliable signal reception, a power amplifier must be used in the transceiver components of the wireless communication system to amplify the signal. It can be said that the performance of the power amplifier will directly affect the working status of the entire system, and it is the core component of the RF front-...

AI Technical Summary

Problems solved by technology

[0005] However, the three-way Doherty power amplifier in the prior art also has the common problem of the traditional Doherty power amplifier—the problem of narrow bandwidth

The load modulation network of the three-way Doherty power amplifier in the prior art still adopts the common 50 ohm quarter-wavelength impedance converter in the prior art, which leads to a relatively large impedance conversion, thus greatly limiting the bandwidth

Images