Towards generalized Doherty power amplifier design for multiband operation
نویسندگان
چکیده
This paper presents a new variant of broadband Doherty power amplifier that employs a novel output combiner. A new parameter αα is introduced to permit a generalized analysis of the recently reported Parallel Doherty power amplifier (PDPA), and hence offer design flexibility. The circuit prototype of the new DPA fabricated using GaN devices exhibits maximum drain efficiency of 85% at 43-dBm peak power and 63% at 6-dB backoff power (BOP). Measured drain efficiency of >60% at peak power across 500-MHz frequency range and >50% at 6-dB BOP across 480-MHz frequency range were achieved, confirming the theoretical wideband characteristics of the new DPA. Keywords—Broadband; combiner; Doherty; GaN HEMT; load modulation; multiband; power amplifier; transmission line.
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