Feed-back circuit for CMOS high voltage generator to program (E) eprom-memory cells
US5546031A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Oct 11, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A feed-back circuit for a high voltage generator including several voltage multiplying stages connected in series, wherein an oscillator generates two clock pulses being 180.degree. out of phase to one another, controlling alternately successive voltage multiplying stages to provide a high voltage pulse at the output of the high voltage generator, the high voltage output being connected to the feed-back circuit generating a control signal supplied to the oscillator, so that the two clock pulses are modified in dependence on the high voltage output voltage, wherein the feed-back circuit includes a high voltage feed-back circuit provided with a capacitive input stage (CP, CR), the output signal (VCTRLHV) of the high voltage feed-back circuit controlling the current of a controlled current source, and at least the oscillator generating the clock pulses receives the current as control signal and in dependence thereon controls the frequency of the clock pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.