Apparatus and method for current sink circuit
US6949972B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2004 |
| Grant date | Sep 27, 2005 |
| Priority date | — |
| Expiry date | Apr 2, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/262
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current sink circuit includes a current mirror, a feedback circuit, a follower circuit, and a current sink. The current mirror includes a power transistor. Also, the current mirror is ratioed such that the drain current of the power transistor is significantly greater than the drain current of the other transistor in the current mirror. The feedback circuit is configured to cause the drain voltages of the power transistor and the other transistor to be substantially equal. Additionally, the follower circuit is configured to quickly pull up the voltage at the gate of the power transistor when the current sink circuit is switched on. The current sink is configured to bias the follower circuit. Also, the current sink is configured to quickly pull down the voltage at the gate of the power transistor when the current sink circuit is switched off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.