Novel broadband filtering power amplifier

Abstract

The invention discloses a novel broadband filtering power amplifier. According to the novel broadband filtering power amplifier, a grid direct-current bias network is used for providing grid bias voltage required by working of a power amplification transistor; a drain direct-current bias network is used for providing drain bias voltage required by the working of the power amplification transistor; an input end impedance matching network comprises a microstrip line, a blocking capacitor and an RC parallel circuit; and an output end impedance matching network comprises a T-shaped tuning network and a band-pass filter, wherein the band-pass filter comprises a parallel coupling microstrip line with the length of lambda / 4 and different loads respectively loaded on four ports of the parallel coupling microstrip line. Compared with an existing mode where a filter and a power amplifier are in direct cascade connection, the invention achieves miniaturization of the whole circuit while ensuring broadband and high efficiency by integrating the band-pass filter into the output matching network.

Description

technical field [0001] The invention belongs to the technical field of power semiconductor devices, in particular to a novel broadband filter power amplifier. Background technique [0002] With the rapid development and progress of communication technology, wireless communication system standards have put forward higher and higher requirements for the performance of radio frequency transmitters. As a key component of the RF front-end, the power amplifier has a great impact on the performance of the transmitter, especially the arrival of the 5G era requires that the RF module can simultaneously support multiple frequency bands in the working frequency band or cover as wide a frequency band as possible and the overall circuit The smaller the volume, the better. The traditional design method is generally to directly cascade the power amplifier and the filter, but this will also increase additional insertion loss and increase the size of the circuit. [0003] Therefore, some d...

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Problems solved by technology

[0003] Therefore, some design ideas of integrating the filter into the input and output network of the amplifier circuit have been proposed, but usually the working bandwidth of the designed power amplifier circuit is not enough to cover the 5G commercial frequency band or the efficiency is not high enough.

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