A new feedback method for power amplifier with unilateralization and improved output return loss

Zuo-Min Tsai *, Kuo Jung Sun, George D. Vendelin, Huei Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Given a device with a conventionally optimized P1 dB point, this paper proposes a new theory for feedback amplifiers to optimize gain and improves S22 (ideally resulting in S22 = 0). The design procedure only requires the small-signal S-parameters and the measured load-pull data of the transistor. To verify this theory, two 800-mW 2-GHz GaAs MESFET amplifiers with and without the lossless feedback were implemented and evaluated. The feedback amplifier achieved significant improvement in linear gain (6 dB), reverse isolation (12 dB), and output return loss (5 dB) with the same output P1 dB for both types of amplifiers.

Original languageEnglish
Pages (from-to)1590-1597
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume54
Issue number4
DOIs
StatePublished - 1 Apr 2006

Keywords

  • Feedback
  • Output power 1-dB compression (P)
  • Power amplifier (PA)

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