High voltage comparator using sliding input low voltage devices
US7528634B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 2006 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Apr 3, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/2481
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage comparator contains low voltage devices (e.g., bipolar or MOS transistors) and high voltage devices (e.g., DMOS transistors). The low voltage devices, which cannot sustain a voltage greater than a relatively small range of variation that is substantially less than the range of potential variation of the input voltage, are connected in a differential amplifier configuration to perform precision differential measurements on the input voltage. The high voltage devices are interconnected with the low voltage devices in a manner that enables operating levels of the low voltage devices to move up/down, or ‘slide’, with variations in the input voltage, so that the low voltage devices are effectively immune to high levels of the input voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.