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Broadband input matching based improved doherty power amplifier

A power amplifier and input matching technology, applied in the direction of improving amplifiers to improve efficiency and improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of poor linearity, inconsistent efficiency of power amplifier bands, achieve uniform input current, and improve turn-on characteristics , the effect of high efficiency

Inactive Publication Date: 2015-04-29
SOUTHEAST UNIV
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Problems solved by technology

[0005] Technical problem to be solved: Aiming at the deficiencies of the prior art, the present invention proposes an improved Doherty power amplifier based on broadband input matching, which is used to solve the inconsistency of the power amplifier band and the resulting low efficiency and linearity. Poor technical issues

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  • Broadband input matching based improved doherty power amplifier
  • Broadband input matching based improved doherty power amplifier
  • Broadband input matching based improved doherty power amplifier

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] like figure 2 As shown, an improved Doherty power amplifier based on broadband input matching of the present invention includes a hybrid coupler 2 connected to a 50Ω matching load 1, a first phase compensator 3, a carrier amplifier 5, and a broadband input matching network 4 , the peak amplifier 6, the second phase compensator 7, the third phase compensator 8, the first λ / 4 impedance transformation line 9 and the combiner 10 containing the second λ / 4 impedance transformation line 101; wherein, λ is multiple The wavelength corresponding to the center frequency of the Herti power amplifier operating frequency, the characteristic impedance of the first λ / 4 impedance transformation line 9 is 50 ohms, and the characteristic impedance of the second λ / 4 impedance transformation line 101 is 35 ohms;

[0039] The first signal output end of the hybrid coupler 2 is conne...

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Abstract

The invention discloses an improved doherty power amplifier. The improved doherty power amplifier comprises a hybrid coupler, a carrier amplifier, a broadband input matching peak value amplifier, a phase compensator, second lambda / 4 impedance transformation line and a combiner; the first signal output end of the hybrid coupler is connected with the signal input end of the carrier amplifier; the signal output end of the carrier amplifier is connected with the first signal input end of the combiner; the second signal output end of the hybrid coupler is connected with the signal input of the phase compensator; the signal output end of the phase compensator is connected with the signal input end of the peak value amplifier; the signal output end of the peak value amplifier is connected with the second signal input end of the combiner. With the adoption of the improved doherty power amplifier, the efficiency is increased, the uniformity and consistency of load modulation effect and efficiency characteristics of a broadband modulation signal belt are improved, and the broadband modulation signal transmission system applies. The invention further discloses a design method of the doherty power amplifier; the starting characteristics of the peak value amplifier are consistent under relatively wide frequency band.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a Doherty power amplifier suitable for wideband modulation signal systems. Background technique [0002] With the rapid development of wireless communication technology, 3G, 4G and even 5G communication technologies have been gradually applied to daily communication. In order to pursue higher data transmission rate and higher capacity business requirements, signal modulation technology with high spectral efficiency is widely used in communication systems. Such a signal modulation technology brings a wideband peak-to-average ratio signal in the transceiver system. In order to avoid signal compression and loss during transmission, the power amplifier must fall back to a low-power state. As the component with the largest power consumption in the entire wireless communication system, the power amplifier consumes 50% of the energy in the communication base station syst...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F1/32
Inventor 朱晓维孙引进张雷孟凡
Owner SOUTHEAST UNIV
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