Doherty power amplifier and method for processing radio-frequency signal thereby

Abstract

The invention discloses a Doherty power amplifier and a method for processing radio-frequency signal thereby. The Doherty power amplifier comprises a power divider, a peak amplifier, a carrier amplifier, a down-frequency conversion processing unit, an up-frequency conversion processing unit, an enveloping extraction unit, a searching unit and a grid voltage value processing unit; an output end of the lower frequency conversion processing unit is connected with an input end of the grid voltage value processing unit sequentially by the enveloping extraction unit and the searching unit, and an output end of the grid voltage value processing unit is connected with a grid end of the peak amplifier; the other output end of the lower frequency conversion processing unit is connected with an input end of the power divider by the upper frequency conversion processing unit, and an output end of the power divider is respectively connected with an input end of the peak amplifier and an input end of the carrier amplifier; an output end of the carrier amplifier is coupled and connected with an output end of the peak amplifier. The peak amplifier of the Doherty power amplifier amplifies to work according to the change of radio-frequency signal enveloping, thus improving the output efficiency of the peak amplifier.

Description

technical field [0001] The invention relates to the design field of power amplifiers in mobile communication systems, in particular to a Doherty power amplifier and a method for processing radio frequency signals by the Doherty power amplifier. Background technique [0002] In recent years, with the large-scale construction of 3G networks, in order to reduce CAPEX (Capital Expenditure, equipment investment) and OPEX (Operating Expense, operating costs), the efficiency of power amplifiers has increasingly become the focus of attention of operators. Common technologies that can improve the efficiency of power amplifiers include: Doherty technology, envelope tracking technology, envelope elimination regeneration technology, adaptive bias technology, peak reduction technology, etc. High-efficiency power amplifiers can not only save electricity bills for operators, but also save investment in supporting facilities such as power supplies. Due to the simplification of the productio...

AI Technical Summary

Problems solved by technology

Since the envelope of the input RF signal is continuously changing, and the grid voltage 1 value of the peak amplifier is fixed, the working state of the peak amplifier cannot be set in real time with the change of the envelope of the RF signal, resulting in the output efficiency of the Doherty power amplifier Relatively low, which limits the improvement of the power amplifier efficiency of Doherty power amplifier

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