Substrate bias generator including multivibrator having frequency independent of supply voltage
US4710647A · kind A · utility
18Cited by
6References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1986 |
| Grant date | Dec 1, 1987 |
| Priority date | — |
| Expiry date | Feb 18, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A CMOS charged pump circuit for biasing the N well of a memory array. The present invention utilizes a multivibrator oscillator coupled to a constant current source to provide a frequency output which is independent of the supply voltage. The multivibrator oscillator uses less power than prior art ring oscillators. Feedback through a comparator circuit is used to monitor the N well voltage so that the multivibrator oscillator and ultimately the charge pump may be duty cycled to further reduce power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.