Doherty power amplifier

Abstract

The invention provides a Doherty power amplifier comprising an unequal power divider, a last stage carrier amplifier, a last stage peak amplifier, a 1 / 4 wavelength wire and a 1 / 4 wavelength long impedance transformer, wherein an output end of the unequal power divider is connected with the last stage carrier amplifier, and a coupling end of the unequal power divider is connected with the last stage peak amplifier; the output end of the last stage peak amplifier is connected with an input end of the 1 / 4 wavelength wire, and the output end of the 1 / 4 wavelength wire and the output end of the last stage carrier amplifier are merged into the 1 / 4 wavelength long impedance transformer. The power amplifier provided by the invention has a wider dynamic range, and can still keep relatively high efficiency in the case of more power rollback. Meanwhile, the phase distortion from small signals to P1dB and P3dB is less than 5 degrees, and the Doherty power amplifier is matched with digital predistortion, it is can be fitted by an algorithm model more easily, an ACLR index has greater improvement. Moreover, the size of the PCB can be reduced, and the product cost is reduced.

Description

technical field [0001] The present invention relates to the technical field of communication, more specifically, to a Doherty power amplifier. Background technique [0002] With the increasing emphasis on energy saving and emission reduction, communication operators have higher and higher requirements for reducing power consumption of wireless communication systems. As the final unit in the wireless communication transmission system, the power amplifier's own power consumption has a huge impact on the efficiency index of the entire communication system. Moreover, the cost ratio of the linear power amplifier in the base station accounts for about 1 / 3, so how to solve the linearization problem of the power amplifier effectively and at low cost is particularly important. [0003] In addition, with the rapid development of mobile communication technology, the amount of information transmitted by mobile communication is increasing, which puts forward higher requirements for the ...

AI Technical Summary

Problems solved by technology

[0005] However, the current Doherty power amplifiers also have different problems, including: it is difficult to determine the input power distribution ratio required for various combinations of multi-channel asymmetric Doherty power amplifiers and peak tubes to achieve performance; power amplifier structure Complexity, high cost, low stability, poor compatibility, and low integration

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