Variable voltage transition circuit
US5087827A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/94
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.