Method and apparatus for reducing distortion in a high efficienc

Details Method and apparatus for reducing distortion in a high efficienc Method and apparatus for reducing distortion in a high efficienc

1997-11-03

1999-08-10

Mottola, Steven J.

Amplifiers

Modulator-demodulator-type amplifier

330136, H03F 338

Patent

active

059364645

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 envelope amplifier (270), a driver amplifier (250), and a power amplifier (260). The driver amplifier (250) includes a dual gate variable gain amplifier (252) that has a substantially constant phase characteristic over a wide dynamic range. The power amplifier (260) is modulated by an amplified envelope signal from the envelope amplifier (270), and is driven by an output of the driver amplifier (250). The operation of the cascaded driver amplifier (250) and power amplifier (260) allow the power amplifier (260) to operate a substantially constant compression point, and reduced distortion.

REFERENCES:
patent: 4465980 (1984-08-01), Huang et al.
patent: 5251330 (1993-10-01), Chiba et al.
patent: 5831475 (1998-11-01), Myers et al.
An article entitled "High-Efficiency Single-Sideband HF/VHF Transmitter Based Upon Envelope Elimination And Restoration" by F.H. Raab and D.J. Rupp, Green Mountain Radio Research Company, USA from IEEE CP392, UK pp. 21-25, Jul. 4-7, 1994.
An article entitled "Class-S High-Efficiency Amplitude Modulator" by Dr. Frederick H. Raab and D.J. Ruppp, Green Mountain Radio Research from GMRR TP93-1:RF Design, vol. 17, No. 5, pp. 70-74, May 1994.
An article entitled "Single-Sideband Transmission By Envelope Elimination and Restoration" by Leonard R. Kahn from Proceedings Of The IRE.

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