Apparatus and method for a variable negative substrate bias generator
US6259310A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1995 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | May 23, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/071
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A VBB voltage generator unit for biasing of the semiconductor chip substrate is comprised of five basic elements, a standard p-channel substrate pump unit a pump supply voltage switch, a VBB level control logic unit, a high and low frequency oscillators unit, and a Vperi voltage divider unit for generating a fractional Vperi voltage. The substrate pump is a standard two-phase p-channel coupling pump. In response to appropriate control signals, p-channel coupling pump can provide a plurality of VBB voltage levels in response to a single oscillator frequency. The VBB voltage levels can be correlated, via the control signals, to the operational mode of the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.