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Analysis and Design of CMOS Doherty Power Amplifier Based on Voltage Combining Method


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Abstract


The impedance at the each input terminal of paper presents a voltage combiningDoherty power amplier in a standard 180 nm CMOS process. This Doherty PA uses a series combining transformer to combine the output power and realize the loadmodulation, which is different from the conventional current combining method. The series combining transformer is analyzed for impedance modulation behavior, and we have provided the design method. The proposed Doherty PA achieves a maximum output power of 27.6 dBm at 1.75 GHz with a peak power added efciency of 35.2 percentage at 3.4 V supply voltage. The PAE at 6 dB back-off is still high, about 29.2 percentage. The PA has 24.2 dBm output power with 30.2 percentage.PAE at 37 dBc ACLR (5 MHz offset) and 25.2 dBm output power with 32 percentage PAE at 33 dBc ACLR (5 MHz offset) at 1.75 GHz under a wideband code division multiple access signal with 3.3 dB PAPR and 3.84 MHz BW.

KeyWords
CMOS power amplier, Doherty power amplier, uneven drive, series combining transformer, load modulation.



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