Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1994-10-24
1996-07-02
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330267, H03P 326
Patent
active
055326455
ABSTRACT:
A circuit for regulating the charging time of the output node of an amplifier at start up. The output node commonly comprises an external soft-start capacitor charged by a current delivered by a pull-up transistor of a push-pull output stage of the amplifier, through a decoupling diode that is functionally connected between the output node of the amplifier and a terminal of the external soft-start capacitor. The present application provides a current mirror feed back circuit capable of mirroring the charge current of the external soft-start capacitor onto the driving node of the pull-up transistor of the output stage of the amplifier. The regulating circuit permits use of an external capacitance of extremely small size. Upon the reaching of a fully charged condition by the external capacitor, the control circuit self-isolates and does not influence in any way the normal operation of the amplifier.
REFERENCES:
patent: 3766410 (1973-10-01), Elsaesser
patent: 3995228 (1976-11-01), Pass
patent: 4453193 (1984-06-01), Huang et al.
patent: 5148115 (1992-09-01), Koakutsu et al.
Fagnani Mauro
Ferrario Bruno
Sandri Paolo
Formby Betty
Groover Robert
Mottola Steven
SGS-Thomson Microelectronics S.R.L.
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