Method and apparatus for high efficiency power amplification

Details Method and apparatus for high efficiency power amplification Method and apparatus for high efficiency power amplification

1998-04-01

1999-11-23

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330207A, H03F 338

Patent

active

059907355

ABSTRACT:
A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an multi-stage class S modulator (270), and a power amplifier (260). The multi-stage class S modulator (270) includes multiple stages (480), where each stage includes a pair of switching transistors (430, 440) and a capacitor (450). The capacitor (450) supplies the inrush current requirements of the stage (480) so that filtering at the switching frequency is substantially provided within the stage (480). Multiple stages (480) are included on a single semiconductor substrate resulting in higher switching frequencies, higher modulation bandwidths, and lower external filtering requirements.

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A publication entitled, "High-Efficiency Single-Sideband HF/VHF Transmitter Based Upon Envelope Elimination and Restoration", F.H. Raab and D.J. Rupp, Green Mountain Radio Research Company, USA, 5 pages.
A publication entitled, "Class-S High Efficiency Amplitude Modulator", Frederick H. Raab, Ph.D. and Daniel J. Rupp, Green Mountain Radio Research Company, USA, May 1994, 5 pages.
A publication entitled, "Single-Sideband Transmission by Envelope Elimination and Restoration", Leonard R. Kahn, 4 pages.

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