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:
Mar. 06, 1984
Filed:
May. 01, 1981
Kazuo Koide, Fuchu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A complex logic circuit which fulfills the requirements of high-speed operation, low power consumption and simplicity in circuit setup, includes a first ECL (emitter coupled logic) circuit and a second ECL circuit. The first ECL circuit which drives relatively light loads does not have an emitter follower output circuit in the output thereof. The second ECL circuit which drives relatively heavy loads has an emitter follower output circuit in the output thereof. A level shift means is connected between the load resistor of the first ECL circuit and a point of operation potential, and the voltage drop across the level shift means is set to be substantially equal to the voltage across the base and emitter of the emitter follower output transistor of the second ECL circuit. Thus, the signal levels of the first and second ECL circuits can be made to coincide.