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:
Feb. 11, 1992
Filed:
Feb. 11, 1991
Matthew J Hadwin, Beaverton, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
An improved variable voltage transition circuit of the type that switches a capacitor between charging and discharging current sources when an input voltage transitions, the capacitor being coupled via respective Schottky diodes to tracking clamp circuits, has a compensation circuit that includes second current sources that match the charging and discharging current sources and uses regenerative feedback to turn on and off the Schottky diodes virtually instantaneously when the input voltage transitions. A fixed clamp circuit and a bias switch circuit are coupled between the tracking clamp circuits and one side of the transition switch to provide a conductive path for the second current sources that results in a change in the bias of the tracking clamp circuits such that when the input voltage transitions the 'on' Schottky diode is instantaneously turned off, and the 'off' Schottky diode is turned completely on very quickly after it starts to conduct at the end of the transition.