Broadband high-efficiency three-path Doherty power amplifier based on post-matching network

Abstract

The invention provides a broadband high-efficiency three-path Doherty power amplifier based on a post-matching network. The broadband high-efficiency three-path Doherty power amplifier comprises a three-path equal power divider, a phase compensation network, a carrier amplification circuit, a first peak amplification circuit, a second peak amplification circuit, a compensation line and a rear matching network, wherein each amplifying circuit comprises an input matching network, an amplifier and an output matching network; each output matching network is implemented by adopting an L-shaped LC matching network which is connected with an inductor in series and then connected with a capacitor in parallel; and after the L-shaped LC matching network of the carrier amplifying circuit is convertedinto a microstrip line, a final output matching network is obtained through using an optimization circuit. According to the broadband high-efficiency three-path Doherty power amplifier, the post-matching network and the novel output matching network are adopted, the bandwidth and the output efficiency of the Doherty power amplifier are effectively improved, the defect that the circuit performanceis obviously inconsistent when the networks are applied to the three-path Doherty power amplifiers is overcome by using the optimization circuit, and finally, high-efficiency output in a wide-frequency and wide-backoff range is realized.

Description

technical field [0001] The invention belongs to the technical field of radio frequency communication, in particular to a wideband high-efficiency Doherty power amplifier based on a post-matching network. Background technique [0002] With the continuous development of wireless communication technology, people hope to transmit as much data as possible in the limited spectrum bandwidth. Limited communication spectrum resources make communication organizations usually use very complex modulation methods, and this complex modulation method will increase the signal peak-to-average ratio (PAPR). Taking 4G-LTE signals as an example, the modulated signal after peak-shaving processing The peak-to-average ratio is still 6-12dB. If traditional Class A and Class AB power amplifiers are used to amplify such peak-to-average ratio signals, power backoff is usually used to ensure linear amplification, but the amplification efficiency will be greatly reduced at this time. [0003] Doherty ...

AI Technical Summary

Problems solved by technology

However, in the three-way Doherty power amplifier, when the matching network designed based on lumped parameter elements (capacitors, inductors) is converted into a distributed parameter device (microstrip line) structure, it will bring defects that are not completely consistent with the performance of the original design circuit. , affecting the performance of the entire power amplifier

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