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:
Apr. 07, 1998
Filed:
Nov. 13, 1995
Jerome D Harr, San Jose, CA (US);
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
Fast fall time for ECL logic waveforms are produced by use of a circuit, which very quickly transfers charge from the ECL output load capacitance into a temporary holding capacitor. The charge transferred onto the temporary holding capacitor may then be removed at a leisurely pace. The circuit includes a pulldown transistor, and a control circuit that selectively turns the pulldown transistor on, if the ECL output will be low, or off, if the ECL output will be high. The control circuit includes an emitter-follower transistor which follows the differential ECL collector node that changes voltage inversely to the desired final ECL output. A diode is connected to the emitter-follower transistor's emitter so that the diode output is two diode drops below the ECL collector node inverse in polarity to the output. The diode drives the base of the pulldown transistor, so that the base of the pulldown transistor remains static until the inputs to the circuit change.