Current reference circuit for low supply voltages
US6639451B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2002 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Apr 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current reference circuit for low supply voltages is provided. The current reference circuit includes a series including a resistor and a diode, a current source having one terminal coupled to a supply voltage and another terminal coupled to the series, an operational amplifier having its negative electrode connected to a band gap reference voltage, and a transistor. The diode has its cathode electrode coupled to ground and its anode electrode coupled to the resistor. The transistor has its gate electrode coupled to the output of the operational amplifier, its source electrode coupled to ground, and its drain electrode coupled to both the positive electrode of the operational amplifier and the current source. Also provided are an integrated circuit that includes at least one current reference circuit for low supply voltages and a signal processing system that includes at least one current reference circuit for low supply voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.