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A 1.9-GHz, 1-W CMOS class-E power amplifier for wireless communications

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2 Author(s)
King-Chun Tsai ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA ; P. R. Gray

This paper presents a 1-W, class-E power amplifier that is implemented in a 0.35-μm CMOS technology and suitable for operations up to 2 GHz. The concept of mode locking is used in the design, in which the amplifier acts as an oscillator whose output is forced to run at the input frequency. A compact off-chip microstrip balun is also proposed for output differential-to-single-ended conversion. At 2-V supply and at 1.98 GHz, the power amplifier achieves 48% power-added efficiency (41% combined with the balun)

Published in:

IEEE Journal of Solid-State Circuits  (Volume:34 ,  Issue: 7 )