Ultra-wideband analog pre-distortion method and device

Abstract

The invention discloses an ultra-wideband analog pre-distortion method and device, which comprises a first frequency mixer and a second frequency mixer, wherein the two frequency mixers are respectively connected with a first frequency sweeping local oscillator and a second frequency sweeping local oscillator; the first frequency mixer is connected with a pre-distortion generator; the pre-distortion generator is connected with the second frequency mixer; and the second frequency mixer is connected with a power amplifier. The ultra-wideband analog pre-distortion method comprises a signal frequency conversion step, a pre-distortion signal generation step, a frequency reducing step and a signal counteracting step. According to the scheme, the frequency mixers and the frequency sweeping localoscillators are used for converting an input signal into a radio frequency signal with a fixed frequency; then, the analog pre-distorter is used for generating a pre-distortion signal; finally, the signal is converted to the input frequency through the frequency sweeping local oscillators and the frequency mixers, wherein a distortion signal opposite to the power amplifier is included in the signal at the moment, so that the distortion generated by the power amplifier itself can be counteracted after the signal passes through the power amplifier, and the purpose of improving the linearity of the power amplifier is achieved.

Description

technical field [0001] The invention relates to the field of power amplifiers, in particular to an ultra-wideband analog predistortion method and device. Background technique [0002] At present, analog predistortion circuits at home and abroad are limited by device bandwidth, a single predistortion circuit can only be effective for a specific frequency and circuit complexity, and the frequency band that can be effectively used is often narrow, and the basic use bandwidth is within 15%. It is generally used in places with a narrow working bandwidth such as the communication field, and each predistortion device can only be used for a specific power amplifier, which has poor versatility and generally needs to be customized. The general analog predistorter cannot satisfy the wideband power amplifier, so the wideband power amplifier generally adopts the method of power back-off to achieve better linearization characteristics, which requires the power amplifier to have higher out...

AI Technical Summary

Problems solved by technology

[0002] At present, analog pre-distortion circuits at home and abroad are limited by device bandwidth, and a single pre-distortion circuit can only be effective for a specific frequency and circuit complexity. The frequency band that can be effectively used is often narrow, and the basic use bandwidth is within 15%.

It is generally used in places with narrow working bandwidth such as the communication field, and each predistortion device can only be used for a specific power amplifier, which has poor versatility and generally needs to be customized

The general analog predistorter cannot satisfy the wideband power amplifier, so the wideband power amplifier generally adopts the method of power back-off to achieve better linearization characteristics, which requires the power amplifier to have higher output power and requires a large effort the price of

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