Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2007-04-10
2007-04-10
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
C330S251000
Reexamination Certificate
active
10824590
ABSTRACT:
A switching device operates for selectively connecting either a low-voltage power supply or a high-voltage power supply to a power amplifier. A signal voltage is generated in response to a voltage outputted from the power amplifier. A reference-voltage generation circuit operates for generating a positive-circuit-side reference voltage and a negative-circuit-side reference voltage. A control circuit operates for comparing the signal voltage with the reference voltages and controlling the switching device in response to the results of the comparison. The reference-voltage generation circuit includes a first voltage regulating circuit connected between a positive side of the low-voltage power supply and a first circuit point subjected to a negative potential for generating the positive-circuit-side reference voltage, and a second voltage regulating circuit connected between a negative side of the low-voltage power supply and a second circuit point subjected to a positive potential for generating the negative-circuit-side reference voltage.
REFERENCES:
patent: 4329657 (1982-05-01), Kamiya
patent: 4339730 (1982-07-01), Yokoyama
patent: 4423389 (1983-12-01), Fushiki
“Audio Power Amplifier IC with Shift Power Supply”, STK412-400 Series, SANYO Electric Co. Ltd. Semiconductor Company (as of Jun. 2002).
Mottola Steven J.
Victor Company of Japan Ltd.
Woo Louis
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