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. 17, 1990
Filed:
Jun. 17, 1988
Hiroyuki Itoh, Kodaira, JP;
Toshio Yamada, Kokubunji, JP;
Akira Masaki, Musashino, JP;
Tohru Kobayashi, Iruma, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A transistor circuit of this invention comprises a first transistor for receiving a first bias at its base, resistor means connected to the collector of the first transistor and clamp means connected to the junction between the first transistor and the resistor means, and obtains an output from a terminal of the resistor on the opposite to its junction with the first transistor. When a noise current due to .alpha. rays develops in the first transistor and the output is lowered, the clamp means operates in such a manner that the current flows through the clamp means and prevents the change of the output. The transistor circuit of this invention is connected to a resistor or a transistor and operates as a constant current circuit for supplying a current to the resistor or the transistor so that the current flowing therethrough becomes constant. For example, it is used as a constant current source of an emitter follower to constitute a level shift circuit. It is disposed in a feedback part and used as a constant current source in a logic circuit comprising a logic part consisting of a differential transistor circuit and the feedback part for negatively feeding back the in-phase output of the differential transistor circuit.