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, 1995
Filed:
Feb. 07, 1994
Yoshio Tsuruta, Kawasaki, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
A photoelectric converting circuit having a photodiode generating a photoelectric current in accordance with the quantity of light, a first integrating circuit integrating the photoelectric current to convert it into a voltage, and a charge amplifier amplifying the change in the output voltage of the first integrating circuit. The charge amplifier is composed of a second integrating circuit and a coupling capacitance connected between the output of the first integrating circuit and the input of the second integrating circuit. The change in the output of the second integrating circuit is proportional to the ratio of the coupling capacitance to the integration capacitance of the second integrating circuit. This makes it possible to improve the sensitivity of the photoelectric converting circuit without reducing the value of the integration capacitance of the first integrating circuit.