A Coupler-Based Differential Doherty Power Amplifier with Built-In Baluns for High Mm-Wave Linear-Yet-Efficient Gbit/s Amplifications
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Date
2019
Publication Type
Conference Paper
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Abstract
We propose a Doherty power amplifier architecture with impedance inverting balun and impedance scaling balun to support Doherty active load modulation and Power Back-Off (PBO) efficiency enhancement at high mm-Wave frequencies. Unlike transformer baluns often used at RF frequencies, mm-Wave coupler-based baluns are employed to provide well balanced differential-to-single-ended conversion and absorb device output parasitic capacitance. Moreover, this paper reports that coupler-based balun with 45° electrical length exhibits impedance inverting behavior, which is utilized to construct Doherty active load modulation network in the reported PA design. Adaptive biasing circuit further enhances the Main/Auxiliary PA cooperation. The measured Doherty PA exhibits 20.1dBm P sat , 19.3dBm P 1dB , and 26% peak PAE. At 7dB PBO, the measured PAE is 16.6%, demonstrating 1.45× efficiency enhancement compared to an ideal class-B PA with the same peak PAE at P 1dB .
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published
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Book title
2019 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)
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Pages / Article No.
195 - 198
Publisher
IEEE
Event
2019 IEEE Radio Frequency Integrated Circuits Symposium (RFIC 2019)
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Subject
60GHz; Adaptive bias; Coupler; Coupler-based balun; CMOS; Dynamic bias; Doherty; MM-Wave; Power amplifier
Organisational unit
09757 - Wang, Hua / Wang, Hua