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:
Sep. 05, 2000
Filed:
Apr. 16, 1998
Hiroyuki Funahashi, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
To realize a current-to-voltage conversion IC and a photoelectric conversion IC in which the available frequency range does not become narrower as the conversion gain is increased, in a current-to-voltage conversion IC that has a differential amplifier to which a negative feedback resistor of variable resistance is connected and a photodiode connected to the input terminal of the differential amplifier so that the output current of the photodiode is converted into a voltage by means of the negative feedback resistor, the differential amplifier is provided with a switch for varying the capacitance of a capacitor used as a phase compensating element so that the resistance of the negative feedback resistor and the capacitance of the differential amplifier are varied in an interlocked manner in accordance with a signal fed from outside.