Power supply insensitive PTAT voltage generator
US7777475B2 · kind B2 · utility
4Cited by
6References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2008 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Nov 1, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for generating a voltage that is proportional to an absolute temperature (PTAT voltage). A current generator for generating a current that is proportional to absolute temperature (PTAT current) has an internal resistance and two diodes. The PTAT current is proportional to the resistance, and the temperature coefficient of the PTAT current is defined by the ratio of diode current densities. A feedback circuit has a source follower that is connected to the current generator for driving the output node with a regulated PTAT current wherein the PTAT current is mirrored accurately, providing a constant Vref.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.