Switching current source circuit and control method thereof
US9541939B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2014 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | Dec 3, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/26
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A switching current source circuit is provided. A current source drains a bias current from a power supply via a first mirror transistor. A second mirror transistor has a source coupled to the power supply, a gate coupled to the gate of the first mirror transistor, and a drain for providing an output current. A switch is coupled between the gates of the first and second mirror transistors, and has a control terminal for receiving a control signal. A first capacitor is coupled between the gate of the second mirror transistor and the voltage generating unit. A second capacitor is coupled between the gate of the second mirror transistor and a ground. The voltage generating unit selectively provides a first voltage or a second voltage different from the first voltage to the first capacitor according to the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.