Co-Design of Highly Efficient Power Amplifier and High-Q Output Bandpass Filter
- Authors
- Chen, Kenle; Lee, Juseop; Chappell, William J.; Peroulis, Dimitrios
- Issue Date
- 11월-2013
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Co-design; efficiency; evanescent-mode (EVA) cavity; filter; GaN; matching network; power amplifier (PA); quality factor; resonator; synthesis
- Citation
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.61, no.11, pp.3940 - 3950
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
- Volume
- 61
- Number
- 11
- Start Page
- 3940
- End Page
- 3950
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/101729
- DOI
- 10.1109/TMTT.2013.2284485
- ISSN
- 0018-9480
- Abstract
- This paper reports the first co-design configuration of a power amplifier (PA) in cascade with a high-Q bandpass filter. By matching the filter's input port directly to the transistor's drain node, the conventional output matching network (OMN) of a PA is entirely eliminated. This leads to smaller size/volume, minimized loss, and enhanced overall performance. To enable this co-design method, the matching-filter synthesis theory is proposed and investigated in detail in this paper. Based on this theory, a 3% bandwidth (centered at 3.03 GHz) two-pole filter, implemented using high-Q evanescent-mode cavity resonators, is designed as the PA OMN to provide optimized fundamental and harmonic impedances for a commercial 10-W GaN transistor. Simulation and measured results show that the co-designed PA-filter module yields a desired Chybeshev filter behavior while maintaining excellent PA performance in the passband with 72% efficiency, 10-W output power, >10-dB gain, and 60-dBm output third-order intercept point. This co-designed module experimentally presents a 8% higher overall efficiency compared to a control group developed using a conventional independent PA and filter, which further validates the effectiveness of this method.
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