Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1997-11-28
1999-07-27
Pascal, Robert
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330 10, 330297, H03G 320
Patent
active
059297026
ABSTRACT:
A method and apparatus for efficient power amplification of a high dynamic range signal includes an envelope detector (220), a multi-range modulator (270), and a power amplifier (260). The multi-range modulator (270) efficiently amplifies the envelope of the input signal by selecting a power source as a function of the amplitude of the input signal. Multi-range modulator (200) produces a pulsewidth modulated signal with a duty cycle and an amplitude. When the amplitude of the input signal rises above a reference, the duty cycle and the amplitude are modified so as to keep the multi-range modulator in an operating region of high efficiency.
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patent: 5251330 (1993-10-01), Chiba et al.
patent: 5777519 (1998-07-01), Simopoulos
patent: 5825248 (1998-10-01), Ozawa
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. Rupp, 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, Jul. 1952 .
Buer Kenneth Vern
Myers Ronald Gene
Raab Frederick H.
LeMoine Dana B.
Motorola Inc.
Nguyen Khanh Van
Pascal Robert
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