Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2008-03-26
2009-11-17
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
C330S307000
Reexamination Certificate
active
07619479
ABSTRACT:
The semiconductor integrated circuit includes a constant voltage regulator3generating a predetermined constant voltage from an external power supply16, an inverting charge pump circuit2using the output of the constant voltage regulator as its power supply, and an amplifier circuit4using the negative voltage outputted by the charge pump circuit as a reference voltage. The output voltage of the constant voltage regulator is set so that a potential difference between the output voltage of the constant voltage regulator and the output voltage of the charge pump circuit is not to exceed a withstand voltage of the amplifier circuit, and power is supplied to the constant voltage regulator and amplifier circuit from a single external power supply. Even if the voltage of the external power supply increases, the negative voltage output of the charge pump circuit does not change, permitting an increase in the maximum value of the external power supply voltage with account taken of the withstand voltage.
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patent: 2000-040385 (2000-02-01), None
Azuhata Satoshi
Yamamoto Makoto
Choe Henry K
Hamre Schumann Mueller & Larson P.C.
Panasonic Corporation
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