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. 19, 1989
Filed:
Feb. 03, 1988
Applicant:
Inventors:
Kenichi Imamura, Atsugi, JP;
Masao Taguchi, Sagamihara, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307362 ; 307322 ; 357 12 ; 357 16 ; 357 34 ; 357-4 ;
Abstract
A comparator circuit comprises a differential amplifier supplied with a reference signal and an input signal. A resonant-tunneling transistor has a base supplied with an output signal of the differential amplifier. A collector is connected to a first power supply source via a resistor. An emitter is connected to a second power supply source. Therefore, it is possible to simplify a circuit configuration of the comparator circuit and to improve an operation speed of the comparator circuit by outputting an output signal from a connection portion between the resistor and the collector of the transistor.