Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume 69, Issue 4, Pages 2091-2095Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2022.3141423
Keywords
Nonlinear output capacitance effect; power amplifier; quasi-Class-J; Q-factor
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Funding
- Key-Area Research and Development Program of Guangdong Province [2018B010115001]
- National Natural Science Foundation of China [61822110, 61931009]
- Guangdong Innovative and Entrepreneurial Research Team Program [2017ZT07X032]
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This paper proposes a broadband high-efficiency quasi-Class-J power amplifier based on the nonlinear output capacitance effect, which increases output power and efficiency by increasing current magnitude, and can work in a wide frequency band.
In this brief, a broadband high-efficiency quasi-Class-J power amplifier (PA) based on nonlinear output capacitance effect is proposed. With the influence of the voltage across between drain and source (v(DS)) at the over-driven condition, the negative second harmonic termination has been generated by the nonlinear output capacitance (C-out). Since the proposed PA is driven into saturation, the current magnitude can be increased which improves the output power and efficiency. Meanwhile, the fundamental termination is modulated near the real axis of the Smith chart by the second harmonic termination, which reduces the Q-factor to extend the bandwidth. It is possible to achieve the saturated PA working in the wide frequency band. Finally, the proposed PA shows a relatively high performance of greater than 39.6 dBm saturated output power, and delivers an average of 64 % drain efficiency (DE) from 3.5 to 5.5 GHz.
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