Switched capacitor voltage reference circuits using transconductance circuit to generate reference voltage
US6819163B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2003 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Apr 14, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/262
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A switched capacitor voltage reference circuit that has a transconductance circuit that receives the output of the amplifier, and then outputs a current that depends on its input voltage. This may be accomplished using a charge pump that is controlled by the amplifier output. The transconductance circuit provides a reference voltage at the output terminal of the switched capacitor generation circuit. A capacitor capacitively couples the output terminal of the switched capacitor circuit to the inverting terminal of the amplifier during the generation phase. By adjusting the capacitances of the various capacitors, the level and temperature dependence of the generated reference voltage may be controlled. Also, the charge pump often allows for reference voltages that are greater than the supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.