Doherty envelope tracking power amplifier and method for treating radio frequency signal

Abstract

The invention discloses a Doherty envelope tracking power amplifier and a method for treating a radio frequency signal. The amplifier comprises a power divider, a peak amplifier, a carrier amplifier, a coupler, an envelope extraction unit and a first linear amplification unit, the input end of the radio frequency signal is respectively connected with the input end of the power divider and the input end of the envelope extraction unit by the coupler, the output end of the power divider is respectively connected with the input end of the peak amplifier and the input end of the carrier amplifier, the output end of the carrier amplifier is connected with the output end of the peak amplifier in a coupling way, and the output end of the envelope extraction unit is connected with the grid electrode end of the carrier amplifier by the first linear amplification unit. According to envelope changes of the input radio frequency signal and under the conditions of ensuring the basic changeless output signal gain, the carrier amplifier enables the linearization of output signals to reach real-time optimization and improves the linearization of the output signals of the carrier amplifier, thereby improving the efficacy of the Doherty envelope tracking power amplifier.

Description

technical field [0001] The invention relates to the design field of power amplifiers in mobile communication systems, in particular to a Doherty envelope tracking power amplifier and a method for processing radio frequency signals by the Doherty envelope tracking 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...

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Problems solved by technology

However, since the envelope of the input RF signal changes continuously, and the grid voltage 2 value of the carrier amplifier is fixed, the working state of the carrier amplifier cannot be set in real time as the envelope of the RF signal changes, and the output signal gain cannot be maintained. Under the same condition, the linearization of the signal output by the carrier amplifier is optimized in real time, resulting in a relatively low efficiency of the carrier amplifier, which limits the improvement of the efficiency of the Doherty power amplifier.

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