High-efficiency ultralinear DFFA mobile digital television and mobile broadband communication power amplifier

Abstract

The invention relates to a high-efficiency, ultralinear and high-speed self-adapting and self-healing control DFFA mobile digital television and a mobile broadband communication power amplifier. In the invention, two feedforward structures of three-ring type and pre-distortion type are adopted to realize ultralinear amplification; temperature compensation attenuation, linear temperature compensation and equal power, unequal power and power synthetic type DOHERTY self-adapting high-efficiency matching technology are adopted to realize high-stability high-efficiency amplification; microprocessor interpolation, look-up table width scope optimizing and a self-lock high-speed self-adapting control vector modem are adopted to realize precise matching, wide scope, stable balance and high-speed self-adapting control self-adapting control to each signal, a distortion ring and Doherty; and double-voice IQ modem high suppression is adopted to realize pure extraction of control signals and remnant distortion signals. The invention detects the work condition in real time, and gives an alarm during abnormality and can be automatically healed so as to remove abnormality.

Description

Technical field: [0001] The invention relates to a power amplification technology, in particular to a high-efficiency super-linear DFFA (Doherty & Feed Forward Linear Power Amplifiers) mobile digital television and mobile broadband communication power amplification technology. Background technique: [0002] Mobile digital TV and mobile broadband communication adopt mQAM and OFDM modulation technology. The core technology is to achieve high-efficiency, high-linearity and high-stable broadband high-power amplification under peak-to-average ratio signal conditions. [0003] The existing DPD digital pre-distortion power amplification technology can improve the linearity, and the combination of Doherty technology can greatly improve the efficiency, but the digital pre-distortion power amplification technology has the problem of narrow bandwidth, which is difficult to meet the needs of digital terrestrial television transmission and transmission; DPD digital The improvement of lin...

AI Technical Summary

Problems solved by technology

It uses the pilot signal to simulate the distortion signal. In order to better realize the extraction of the self-locking control signal and the residual distortion signal, it can modulate the two audio signals on the pilot signal in the form of IQ modulation, thus increasing the extraction efficiency. Anti-out-of-band interference ability when locking control signal and residual distortion signal; it adopts multiplier type or IQ demodulation type distortion coupling to pin detection when the distortion is canceled, and solves the residual pilot detection of the existing feedforward adaptive power amplifier difficult problem; it has two types of three-ring type and pre-distortion type DFFA mobile digital TV and mobile broadband communication power amplifier, which can improve the linearity and increase the power of the main power amplifier

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