Power Amplifier with Digital Pre-Distortion Compensation and Combination Cancellation Function

Abstract

The invention discloses a power amplifier with a digital predistortion compensation and combiner offset function. The power amplifier comprises a digital predistortion unit circuit, an intermediate frequency circuit, a small signal amplifying circuit, a first power divider, a driving amplifying circuit, a reference signal adjusting circuit, a final stage amplifying circuit, a first combiner, a feedback detection circuit and a signal processing and controlling circuit. In the power amplifier, the digital predistortion unit circuit is additionally arranged, and meanwhile, self-offset can be realized through two paths of outputs of the final stage amplifying circuit, so that compared with the conventional digital predistortion and Doherty circuit, the power amplifier has the advantages of higher efficiency and higher linearity, and the efficiency of the power amplifier can be up to 45-52 percent. The power amplifier has the advantages of good linear index, high efficiency index, low hardware implementation cost, and good working reliability and stability.

Description

technical field [0001] The invention relates to a power amplifier, in particular to a power amplifier with functions of digital pre-distortion compensation and combination cancellation. Background technique [0002] At present, digital pre-distortion technology is widely used in wireless communication base station systems. However, digital pre-distortion is limited by the saturation power of power amplifiers. Only when the power amplifier falls back to a sufficient value can a better linear compensation effect be obtained. At the same time, the compensation of digital pre-distortion There are also certain limitations, and it is not possible to compensate all the distortion generated by the power amplifier. Therefore, if the compensation capability can be further improved on the basis of digital pre-distortion compensation, the power amplifier will have less fallback, especially if it is less than the peak-to-average ratio of the signal. It is a topic worth discussing that be...

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Problems solved by technology

[0002] At present, digital pre-distortion technology is widely used in wireless communication base station systems. However, digital pre-distortion is limited by the saturation power of power amplifiers. Only when the power amplifier falls back to a sufficient value can a better linear compensation effect be obtained. At the same time, the compensation of digital pre-distortion There are also certain limitations, and it is not possible to compensate all the distortion generated by the power amplifier. Therefore, if the compensation capability can be further improved on the basis of digital pre-distortion compensation, the power amplifier will have less fallback, especially if it is less than the peak-to-average ratio of the signal. It is a topic worth discussing to be able to obtain better linearity even under low conditions. The less the back-off of the power amplifier is, the higher the efficiency can be obtained.

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