Precision bandgap reference circuit
US5900773A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1997 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Apr 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A precision bandgap reference circuit which uses an operational amplifier that has the positive and negative input terminals connected to a diode/resistor combination and a diode respectively. The output of the operational amplifier drives a diode connected PMOS transistor which regulates current sources which drives into the diode/resistor combination and the diode inputs to the operational amplifier. This allows the operational amplifier to have enough gain to minimize errors across the diode/resistor combination and the diode inputs to the operational amplifier. This also allows an output stage driven by the operational amplifier to be biased with a Proportional To Absolute Temperature (PTAT) current which is well controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.