Method and apparatus for delay matching in a power amplifier

Details Method and apparatus for delay matching in a power amplifier Method and apparatus for delay matching in a power amplifier

1997-08-04

1998-11-03

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330136, H03F 338, H03G 320

Patent

active

058314750

ABSTRACT:
A method and apparatus for efficient power amplification with low distortion includes a surface acoustic wave delay line (210), an envelope detector (220), an envelope amplifier (270), and a power amplifier (260). An envelope amplifier (270) includes a pulsewidth modulator (275), a driver (280), switching transistors (285), and a low pass filter (290). The surface acoustic wave delay line (210) functions to balance the delay of the envelope and the carrier of the signal to be amplified. The use of the surface acoustic wave delay line (210) obviates the need for a separate delay line in the phase path of the amplifier.

REFERENCES:
patent: 4831334 (1989-05-01), Hudspeth et al.
patent: 5249201 (1993-09-01), Posner et al.
patent: 5251330 (1993-10-01), Chiba et al.

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