Pulse width generating circuit synchronized with clock signal and corresponding to a reference voltage
US4687998A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1985 |
| Grant date | Aug 18, 1989 |
| Priority date | — |
| Expiry date | Jul 29, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse generating circuit is provided for generating a pulse having a time width synchronized with an input pulse and corresponding to a reference voltage. The circuit is particularly designed not to be affected by parasitic capacitance. A circuit for charging one electrode of an integrating circuit with a constant current is controlled by turning on or off a switch in response to the input pulse. The other electrode of the integrating capacitor is connected with a reference voltage source by driving a switch in response to a pulse having a pulse width which contains the time period of the input pulse and which is wider than the input pulse. A comparator is provided for comparing the potential at one electrode of the integrating capacitor and ground potential. A desired pulse is generated by a logic circuit which is receives both the output of the comparator and the input pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.