Design of high-efficiency current-mode class-D amplifiers for wireless handsets
Authors:
- P.J. ZampardiPZP.J. Zampardi
- M. IwamotoMIM. Iwamoto
- P.M. AsbeckPAP.M. Asbeck
- 17 January 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 53 (1) , 144-151
Abstract
Design considerations are discussed for current-mode class-D (CMCD) microwave power amplifiers. Factors affecting amplifier efficiency are described analytically and via simulation. Amplifiers are reported that incorporate parallel LC resonators alongside the switching transistors. To reduce parasitic resistance, bond-wires were utilized to implement a high Q inductor in the LC resonator. An experimental CMCD amplifier based on GaAs HBTs is reported, with collector efficiency of 78.5% at an output power of 29.5 dBm (0.89 W) at 700 MHz.Keywords
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