Capacitively coupled switched current source
US8324957B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2010 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Jan 9, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/262
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current source is switchable between two precisely defined output currents. A terminal of a coupling capacitor is coupled to the gate of an output MOSFET. The other terminal of the capacitor is switched between two reference voltages to toggle the output MOSFET to output the selected one of the two currents. A switchable bias voltage source is coupled to the gate only during the on state of the output MOSFET to set the gate voltage of the output MOSFET. The current output of the current source is quickly and accurately changed. A reference MOSFET is not directly coupled to the output MOSFET, so there are no slow settling components coupled to the gate of the output MOSFET.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.