Power amplifier used for polar coordinate transmitter

Abstract

The invention discloses a power amplifier used for a polar coordinate transmitter. The power amplifier used for the polar coordinate transmitter comprises a first power amplifier tube, an adder and at least two harmonic injection units; the output end of the first power amplifier tube is connected with the first input end of the adder; each harmonic injection unit comprises defected ground, a power amplifier tube and a moving direction unit which are connected in sequence; the output end of the moving direction unit is connected with the input end of the adder. The defected ground comprises a microstrip line and an incomplete dumbbell structure; the microstrip line is arranged in the middle of the incomplete dumbbell structure. According to the invention, a DGS (defected ground structure) is adopted for injecting harmonic waves for reverse class-F power amplification, the amplitude modulation bandwidth can be increased widely, signal deformation caused by an amplitude-scaling passage can be reduced, and the internal circuit structure can also be simplified and the probability of miniaturization of the polar coordinate transmitter can be achieved.

Description

technical field [0001] The invention relates to a power amplifier of a microwave circuit, in particular to a power amplifier for a polar transmitter. Background technique [0002] The polar transmitter is a high-efficiency transmitter structure and helps to achieve the goal of an all-digital flexible transmitter. The polar coordinate transmitter is different from the rectangular coordinate transmitter. It needs to convert the rectangular coordinate information I / Q into polar coordinate ρ / θ information, amplify them separately, and finally combine them into a rectangular coordinate modulated signal for transmission. The efficiency advantage of polar transmitters is reflected in their ability to use highly efficient power amplifiers. Therefore, it is of great practical significance to study the high-performance and miniaturized polar coordinate transmitter. [0003] In the prior art, the polar coordinate transmitter usually adopts some E-type switching power amplifier struct...

AI Technical Summary

Problems solved by technology

For example, methods such as adding a resonant unit to the output of the class E power amplifier and controlling the drain voltage and current are adopted, but these methods cannot expand the bandwidth of the amplitude modulation, and the amplitude amplification channel with limited bandwidth will cause signal distortion

Due to the high oversampling rate of the pulse modulator, the frequency and bandwidth of the signal entering the power modulator will be very high. Due to the limited frequency response bandwidth of the switching power amplifier, it is very difficult to maintain a high average efficiency in this case

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