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Transformer-coupled power amplifier stability and power back-off analysis
- Source :
- IEEE Transactions on Circuits and Systems-II-Express Briefs. June, 2008, Vol. 55 Issue 6, p507, 5 p.
- Publication Year :
- 2008
-
Abstract
- We present a mathematical analysis of the common-mode instability and power back-off feature of a transformer-coupled Class-AB differential power amplifier (PA). The efficient impedance matching of the transformer combiner and efficiency improvement at power back-off, a major benefit of this structure, are illustrated. In addition, an analytical model is derived to predict the common-mode oscillations in PA. The analytical results, based on a simple hand-calculation model for the transistor, show good agreement with simulation results using complete 90-nm models. Two methods to suppress the common-mode oscillations are investigated and analyzed in detail. Index Terms--CMOS, power amplifiers (PAs), power combining, stability.
Details
- Language :
- English
- ISSN :
- 15497747
- Volume :
- 55
- Issue :
- 6
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Circuits and Systems-II-Express Briefs
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.180799308