The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2009
Filed:
Mar. 26, 2008
Satoshi Azuhata, Osaka, JP;
Makoto Yamamoto, Osaka, JP;
Satoshi Azuhata, Osaka, JP;
Makoto Yamamoto, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The semiconductor integrated circuit includes a constant voltage regulatorgenerating a predetermined constant voltage from an external power supply, an inverting charge pump circuitusing the output of the constant voltage regulator as its power supply, and an amplifier circuitusing 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.