Co-Design of highly efficient power amplifier and high-Q output bandpass filter

Kenle Chen, Ju Seop Lee, William J. Chappell, Dimitrios Peroulis

Research output: Contribution to journalArticle

35 Citations (Scopus)

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.

Original languageEnglish
Article number6628000
Pages (from-to)3940-3950
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Volume61
Issue number11
DOIs
Publication statusPublished - 2013 Oct 17

Fingerprint

power amplifiers
Bandpass filters
bandpass filters
Power amplifiers
Q factors
filters
output
Transistors
transistors
modules
Cavity resonators
cavity resonators
Poles
cascades
poles
impedance
bandwidth
Bandwidth
harmonics
synthesis

Keywords

  • Co-design
  • efficiency
  • evanescent-mode (EVA) cavity
  • filter
  • GaN
  • matching network
  • power amplifier (PA)
  • quality factor
  • resonator
  • synthesis

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

Cite this

Co-Design of highly efficient power amplifier and high-Q output bandpass filter. / Chen, Kenle; Lee, Ju Seop; Chappell, William J.; Peroulis, Dimitrios.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 11, 6628000, 17.10.2013, p. 3940-3950.

Research output: Contribution to journalArticle

Chen, Kenle ; Lee, Ju Seop ; Chappell, William J. ; Peroulis, Dimitrios. / Co-Design of highly efficient power amplifier and high-Q output bandpass filter. In: IEEE Transactions on Microwave Theory and Techniques. 2013 ; Vol. 61, No. 11. pp. 3940-3950.
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