Large-bandwidth compact Doherty power amplifier structure

Abstract

A large-bandwidth compact Doherty amplifier structure is disclosed and mainly comprises two parts, namely a main power amplifier branch and a peak amplifier branch. A main power amplifier input matching network, a main power amplifier and a main power amplifier output matching network are branched from the main power amplifier, the peak amplifier branches are provided with a peak power amplifier input matching network, a peak power amplifier and a peak power amplifier output matching network. In addition, the input ends of the paths of the two amplifiers are power dividers, and the output endsof the paths are loads, according to the Doherty amplifier, an impedance transmission line and an offset line in a Doherty framework are completely removed by adopting a no-transmission-line load modulation structure, so that the bandwidth limitation of the Doherty amplifier is solved. The working bandwidth of the amplifier is completely defined by the impedance matching network, the structure ofthe amplifier is more compact, the output loss is reduced, and the bandwidth range and efficiency of the amplifier are improved.

Description

technical field [0001] The invention relates to the technical field of communication, especially the design and manufacture of a large bandwidth range and a compact Doherty power amplifier, which improves the drain efficiency in the case of a power back-off of 6dB, thereby improving the performance of the Doherty power amplifier. Background technique [0002] The radio frequency power amplifier is one of the most important modules in the launch system, and has been widely used in satellites, broadcasting electronic countermeasures and other systems. With the improvement of wireless communication technology, the fifth generation of communication technology will come out, and there are higher requirements for power amplifiers in communication systems. [0003] The need for high capacity data transmission has led to the use of spectrally efficient modulation schemes. These signals have a high peak-to-average power ratio (PAPR). A power amplifier (PA) has a high PAPR signal an...

AI Technical Summary

Problems solved by technology

[0004] One limitation of the Doherty amplifier is its operating bandwidth

The presence of quarter-wavelength transmission liners and bias lines limits the operating bandwidth of the Doherty amplifier

Because in these designs, people are very concerned about the impedance parameters of power devices and the anti-mismatch ability of devices, which cannot be solved by common measurement methods.

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