Band-gap voltage reference having an improved current mirror circuit
US4349778A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1981 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | May 11, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The disclosed band-gap voltage reference circuit has an NPN feedback path for minimizing the value of the frequency compensation capacitor and for rejecting power supply line voltage variations. The feedback path includes a current mirror circuit which is comprised of a diode and a transistor which are connected between the collector electrodes of the transistors of a band-gap voltage reference cell. Balanced current supply circuits are also connected to the collector electrodes of the voltage reference cell transistors. The output voltage of the cell is utilized to clamp the voltages across the current supplies at substantially equal magnitudes so that voltage changes across the current supplies, due to line voltage variations for instance, do not deleteriously affect the regulating action of the voltage regulator cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.