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:
Jul. 16, 1985
Filed:
Apr. 12, 1982
Yoshio Oida, Funabashi, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A comparator circuit comprising an operational amplifier for comparing a reference input signal at a given voltage and an input signal at an unknown voltage to produce a signal representing the result of the comparison, a first constant current source for feeding a constant current to the operational amplifier, an output transistor, having its base connected to the output of the operational amplifier, for controlling the output of the circuit, and a second constant current source for feeding a constant current to the base of the output transistor. This configuration enables the comparator circuit to operate normally, even when the input voltage is less than the reference voltage and is equal to zero.