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This paper presents a comprehensive theoretical study on Doherty power amplifiers (PAs) under antenna impedance mismatch. It is demonstrated for the first time that by varying the relative gain and phase of the carrier and peaking amplifiers, the PA performance degradation caused by the antenna impedance mismatch can be largely compensated. Such a compensation effect is discussed extensively for different...
The RF power amplifier (PA) is typically the most power hungry and area consuming block in a wireless transceiver system. A viable RF PA solution should offer competitive power and area efficiency while maintaining high-performance large-signal RF operations. Fully integrated RF PA in CMOS has been an area of active research and development over the past years. Recently, there has been a surge of...
A push-pull Class-AB CMOS PA is implemented using a broadband load-pull matching technique. The amplifier achieves a -3 dB bandwidth of 5.2 to 13 GHz with +25.2 dBm peak Psat and 21.6% peak PAE. The EVM for QPSK (4.5 MS/S) and 16 QAM (5 MS/s) are below 2.9% and 6.8% at 1 dB compression point. The measured BER for a wideband BPSK signal up to 7.5 Gb/s is less than 1013.
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