A new feedback method for power amplifier with unilateralization and improved output return loss
| Autor: | Zuo-Min Tsai, George D. Vendelin, Kuo-Jung Sun, Huei Wang |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Lossless compression
Engineering Radiation business.industry Amplifier Transistor Impedance matching Electrical engineering Condensed Matter Physics law.invention law Negative feedback amplifier Electronic engineering Return loss Scattering parameters MESFET Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 54:1590-1597 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2006.871347 |
| Popis: | Given a device with a conventionally optimized P/sub 1 dB/ point, this paper proposes a new theory for feedback amplifiers to optimize gain and improves S/sub 22/ (ideally resulting in S/sub 22/=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 P/sub 1/dB for both types of amplifiers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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