Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1995-07-07
1997-10-07
Mottola, Steven
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330136, H03F 126
Patent
active
056752881
ABSTRACT:
A linearization circuit for a non-linear amplifier optimizes the overall efficiency (>50%). To achieve high efficiency the amplifier is operated in class "E" or class "F" and near saturation, causing phase and amplitude non-linearity. Phase non-linearity is corrected conventionally by a phase error signal generated in a feedback loop. Amplitude non-linearity is corrected by operating on the power supply modulator of the non-linear amplifier in an open loop configuration, using the input signal power. Further, more refined correction of amplitude non-linearity can be effected by operating on an automatic gain control amplifier on the input side of the non-linear amplifier, the gain of the automatic gain control amplifier being controlled by an amplitude error signal generated in a feedback loop.
REFERENCES:
patent: 5101173 (1992-03-01), DiPiazza et al.
patent: 5142240 (1992-08-01), Isota et al.
patent: 5182524 (1993-01-01), Hopkins
1993 43rd IEEE Vehicular Technology Conference, 18 May 1993, Secaucus NJ USA, pp. 672-675, XP393272, M. A. Briffa et al, "Dynamically Biased Cartesian Feedback Linearization".
Azzara Jean-Claude
Baretto da Rocha Paulo
Foucher Jean-Luc
Peyrotte Christian
Alcatel Espace
Mottola Steven
LandOfFree
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