Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1995-10-19
1998-03-31
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327112, 327308, 327312, 327560, 330265, 330271, 330278, 330279, H03K 508
Patent
active
057342873
ABSTRACT:
Distortion control in a push-pull output stage of a speech amplifier of a telephone powered through the telephone line is more effectively and advantageously implemented by independently sensing an eventual state of saturation reached by any of the two output transistors of the amplifier, summing the current signals representative of the sensed state of saturation of either or both output transistors, integrating the resulting sum current signal to produce a DC signal and using the DC signal for activating an AGC loop. The DC signal indiscriminately accounts for any cause of saturation, though virtually representing the level of the amplified AC signal. Distortion may be controlled without penalizing output voltage swing and power consumption.
REFERENCES:
patent: 4509020 (1985-04-01), van de Plassche et al.
patent: 4812779 (1989-03-01), Wagner
patent: 5229721 (1993-07-01), Stade
Patent Abstracts of Japan, vol. 10, No. 248 (E-432), 26 Aug. 1986 & JP-A-61 077 406 (Sanyo Electric Co. Ltd.), 21 Apr. 1986.
Antonini Carlo
Consiglio Pietro
Anderson Matthew
Callahan Timothy P.
Formby Betty
Groover Robert
SGS-Thomson Microelectronics S.R.L.
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