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

1998-09-21

2000-08-08

Mottola, Steven J.

Amplifiers

Modulator-demodulator-type amplifier

330136, H03F 338

Patent

active

061007560

ABSTRACT:
A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), a soft switch modulator (270), and a power amplifier (260). The soft switch modulator (270) drives a high side switch (330), and a low side switch (340) to amplify a pulsewidth modulated signal. Electrical signal path lengths within a soft switch driver (320) are dynamically modified so as to always turn off one switch before turning on the other.

REFERENCES:
patent: 4162455 (1979-07-01), Birt
patent: 5023566 (1991-06-01), El-Hamamsy et al.
patent: 5251330 (1993-10-01), Chiba et al.
patent: 5757173 (1998-05-01), Agiman
patent: 5812010 (1998-09-01), Hook
patent: 5861777 (1999-01-01), Sigmon et al.
patent: 5929702 (1999-07-01), Myers et al.
Article entitled "Class-S High-Efficiency Amplitude Modulator", published by RF Design--vol. 17, No. 5 (May 1994).

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