MOS bandgap voltage reference circuit
US4839535A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Feb 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/267
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A bandgap voltage reference circuit manufactured with a MOS process is provided which is stable over temperature variations as well as variations in threshold voltage that does not require an operational amplifier. The reference is generated by a MOS current source two sourcing current to substrate bipolar transistors operating at different current densities and operated as emitter followers having a pair MOS current mirrors sinking current therefrom. A start-up circuit initializes the circuit upon application of supply voltages. An output stage multiplies the bandgap reference voltage to the desired output voltage level. A feedback stage improves the accuracy of the output voltage by adjusting the current in the reference circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.