Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1997-07-02
1999-01-19
Pascal, Robert
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330149, H03G 330
Patent
active
058617779
ABSTRACT:
A method and apparatus for efficient power amplification with low phase distortion includes an envelope detector (30), a scaling amplifier (40), a driver amplifier (50), and a power amplifier (60). The scaling amplifier (40), in response to the envelope signal from the envelope detector (30), generates a bias signal which causes predistortion in the driver amplifier (50). The predistortion in the driver amplifier (50) compensates for phase distortion in the driver amplifier (50) and the power amplifier (60), resulting in low phase distortion output. An EER-type amplifier (200) with high efficiency utilizes the predistortion of a driver amplifier (250) to compensate for phase distortion in the driver amplifier (250) and a power amplifier (260).
REFERENCES:
patent: 5251330 (1993-10-01), Chiba et al.
patent: 5757229 (1998-06-01), Mitzlaff
An article entitled "Single-Sideband Transmission By Envelope Elimination And Restoration" by Leonard R. Kahn from Proceeding of the I.R.E., 1952.
Jackson Robert Michael
Myers Ronald Gene
Sigmon Bernard Eugene
LeMoine Dana B.
Motorola Inc.
Nguyen Patricia T.
Pascal Robert
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