VBB reference for pumped substrates
US5670907A · kind A · utility
75Cited by
12References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1995 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Mar 14, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An embodiment of a pumped substrate system includes an oscillator, capacitive pump, comparing circuit, and a level shifter. The level shifter is coupled between the substrate and the positive input lead of the comparator and shifts the voltage level present on the substrate by a voltage Vbg. The comparator compares ground potential to the shifted substrate voltage. The oscillator, capacitive pump and comparing circuit form a negative feedback loop which operates to maintain the substrate voltage substantially equal to -Vbg. In one embodiment, the level shifter includes a band gap reference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.