Voltage reference generator circuit subtracting CTAT current from PTAT current
US7224210B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2004 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Oct 23, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/267
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A voltage reference generator generates a stable reference voltage that is less than the bandgap voltage of silicon for power supply voltages less than 2V, yet provides sufficient voltage headroom to operate a current mirror. In one embodiment, the voltage reference generator has a power supply rejection ratio of at least 60 dB and has comparable noise performance as compared to traditional bandgap cirucits. These advantages are achieved by subtracting a current proportional to a complement of an absolute temperature from a current proportional to the absolute temperature to generate a voltage having a positive temperature coefficient, which is then added to a voltage that is a complement of the absolute temperature to achieve a voltage that has a low temperature coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.