Feed-forward power amplifier on basis of current detection self-adaption method

A technology of power amplifier and current detection, which is applied in the direction of power amplifier and improved amplifier to reduce nonlinear distortion, etc. It can solve the problems of weakening signal offset performance of feedforward system and deterioration of system linearity, etc., and solves the problem of high gain stability , simple circuit, easy to achieve effect

Active Publication Date: 2015-04-22
WUHAN HONGXIN TELECOMM TECH CO LTD
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AI Technical Summary

Problems solved by technology

Theoretically, the feedforward power amplifier can well cancel out the false signal, but with the change of the working environment and temperature of the whole system, the amplitude and phase parameters will be mismatched, and the signal cancellation performance of the feedforward system will be greatly weakened. The linearity of the whole system deteriorates sharply

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  • Feed-forward power amplifier on basis of current detection self-adaption method
  • Feed-forward power amplifier on basis of current detection self-adaption method

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with accompanying drawing:

[0014] see figure 2 , the present invention specifically includes: a coupler 1, a phase vector regulator 2, a main amplifier 3, a coupler 4, a delay filter 5, a coupler 6, a delayer 8, a combiner 9, an amplitude vector regulator 7, Distortion signal amplifier 10, error amplifier 11, current detection circuit 13, single chip microcomputer 14. Wherein, the single-chip microcomputer 14 is the control module described in the present invention.

[0015] Working principle: After the mobile communication signal enters the power amplifier, it first passes through the coupler 1 to couple part of the input signal out, then passes through the phase vector regulator 2, and then enters the main amplifier 3, and after being amplified by the main amplifier 3, it is input to the coupler 4 , the signal coupled by the coupler 4 passes through the amplitude vector adjuster 7 , and after th...

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Abstract

The invention discloses a feed-forward power amplifier on the basis of a current detection self-adaption method, which comprises a primary cancellation loop and a secondary cancellation loop. The primary cancellation loop is used for removing work signals and extracting error signals, and the secondary cancellation loop is used for removing distortion component output from the amplifier. The current detection self-adaption technology is applied to the primary cancellation loop, current of a distortion signal amplifier after primary cancellation is detected by a current detection circuit, an MCU (microprogrammed control unit) monitors current detection values in real time, regulators for automatically regulating phase shift and amplitude modulation vector of the primary cancellation loop change phase shift and amplitude modulation parameters, so that the current detection value is minimized, the output power of the distortion signal amplifier is minimized, the carrier signals of a combiner can be cancelled to the utmost extent, and the best cancellation effect of the loops is achieved.

Description

technical field [0001] The invention relates to the field of power amplifier design in a mobile communication system, in particular to a feedforward power amplifier based on a current detection self-adaptive method. Background technique [0002] In recent years, with the large-scale expansion of 3G networks, the demand for multi-carrier base station amplifiers is also increasing. The core multi-carrier base station amplifier power amplifier has high output power and high linearity requirements. focus of business attention. At present, the most widely used linearization technologies are digital predistortion technology (DPD) and feedforward technology. Since digital predistortion technology (DPD) currently does not support frequency hopping, feedforward technology is still the mainstream linearization technology for multi-carrier base station amplifier power amplifiers. . [0003] like figure 1 As shown, the principle of the traditional double-loop feedforward system: the ...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H03F1/32H03F3/20
Inventor刘金峰江鹏陈俊涛吴亮宇
OwnerWUHAN HONGXIN TELECOMM TECH CO LTD