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. 06, 1993
Filed:
Dec. 05, 1991
Toru Shiomi, Hyogo, JP;
Jun Takahashi, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An input buffer circuit applicable as a BiCMOS RAM address buffer is disclosed. An improved level shift circuit 59 includes PMOS transistors 14 and 17 for bypassing emitter follower transistors 12 and 15, and NMOS transistors 13 and 16 for constituting a controllable current source Two differential amplifier circuits operating in response to an input signal having an ECL logic amplitude are provided, and emitter follower transistors 12 and 15 are driven by one of them, MOS transistors 13, 14, 16, and 17 are driven by the other. High operating speed is achieved under less current consumption, since emitter follower transistors 12 and 15, and MOS transistors 13, 14, 16, and 17 are driven, respectively.