Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-01-30
2000-01-18
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330259, 330292, H03F 345, H03F 114
Patent
active
060160799
ABSTRACT:
A power amplifier device is disclosed, comprising a differential amplifier with determined transconductance followed by an intermediate amplification stage with a compensation capacitor between its output and its input and a push-pull output amplifier under low output impedance, for which the common point of connection between an upper stage and a lower stage gives an output of the device. A feedback loop between the output and the differential amplifier is provided in order to temporarily increase the transconductance of the differential amplifier at the passage of the conduction from one stage to the other stage of the push-pull amplifier.
REFERENCES:
patent: 4232273 (1980-11-01), Leidich
patent: 4521740 (1985-06-01), Nakayama
French Search Report from French Patent Application 97 01758, filed Feb. 14, 1997.
Patent Abstracts of Japan, vol. 011, No. 065 (E-484), Feb. 27, 1987 & JP-A-61 224507 (Toshiba Corp.).
W.M. Leach, Jr.: "Suppression of Slew-Rate and Transient Intermodulation Distortions In Audio Power Amplifiers", Journal of the Audio Engineering Society, vol. 25, No. 7/8, Jul. 1977, New York, US pp. 466-473.
Lee Benny
Nguyen Patricia T.
SGS-Thomson Microelectronics S.A.
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