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. 16, 1980
Filed:
May. 24, 1978
Applicant:
Inventor:
Masamichi Furukawa, Tokyo, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; G06G / ;
U.S. Cl.
CPC ...
328127 ; 328128 ; 307229 ; 330110 ;
Abstract
An integrating capacitor is connected between the inverting input and the output of an operational amplifier. A plurality of resistors are connected in series to the inverting input. A plurality of capacitors are connected between the inverting input and junctions of the resistors respectively. The time required for the output voltage of the operational amplifier to reach a predetermined level is an exponential function of a voltage applied to the inverting input through the resistors.