Voltage and temperature invariant current setting circuit
US8008904B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2008 |
| Grant date | Aug 30, 2011 |
| Priority date | — |
| Expiry date | Apr 10, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/262
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current supply circuit provides current that is substantially invariant with voltage supply and temperature changes. The current supply circuit has an input node connectable to a voltage supply and an output node operable to provide an output current. The current supply circuit includes a current source circuit coupled to a reference voltage node and configured to provide the output current at the output node, wherein a voltage at the reference voltage node controls current output of the current source circuit. The current supply circuit also includes a reference-setting circuit coupled to the reference voltage node and operable to establish a reference current level of the current source circuit, a common-emitter circuit coupled to the input node, and an emitter-follower circuit coupled to the input node, the emitter-follower circuit having an input coupled to an output of the common-emitter circuit and an output coupled to the reference voltage node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.