High-efficiency distributed power amplifier with reconfigurable bandwidth

Abstract

The invention discloses a bandwidth-reconfigurable high-efficiency distributed power amplifier, and the power amplifier comprises a plurality of gain modules arranged between an input transmission line and an output transmission line in parallel; a plurality of impedance elements are connected to the input transmission line and the output transmission line in series, and each gain module is arranged between two impedance elements in an inserted mode; each gain module comprises a transistor, a grid electrode of the transistor is connected with the input transmission line through a capacitor C and a resistor R which are connected in parallel, and a drain electrode of the transistor is connected with the output transmission line; at least one impedance element is arranged to be a reconfigurable impedance element, and at least one capacitor C is connected with a reconfigurable capacitor unit in parallel. According to the distributed power amplifier provided by the invention, the reconstruction of the working frequency bands of the two amplifiers can be realized, the limitation of bandwidth on efficiency is broken through, and the power additional efficiency of the amplifier is improved.

Description

technical field [0001] The invention relates to a communication filter device, in particular to a high-efficiency distributed power amplifier with reconfigurable bandwidth and continuous frequency adjustable characteristics. Background technique [0002] In the past 20 years, in the frequency band of 2-18GHZ, more and more attention has been paid to multi-octave broadband power amplifiers. Distributed amplifiers with broadband characteristics are a very suitable topology. At present, the design of distributed power amplifiers has the following aspects: Two methods: (1) adopt the structure of NDPA, which utilizes the characteristics of the traveling wave structure and current superposition of the distributed amplifier, and the power matching of the output terminals of the transistors at all levels can be connected with the characteristic impedance of the artificial drain transmission lines at all levels, so that The characteristic impedance of the drain transmission lines at ...

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Problems solved by technology

[0003] However, the problems of the above two types of amplifiers are limited by the broadband matching itself. According to the Bode-Fano rule, the matching bandwidth is inversely proportional to the matching effect, that is to say, the wider the bandwidth, the worse the matching effect. For amplifiers, the structure of broadband is less efficient than the structure of narrowband, and the efficiency is limited by the inherent frequency band.

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