Accurate constant current generator
US6057727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1998 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Oct 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/262
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relates to a constant current generator including a reference voltage source providing a constant voltage with respect to a first ground; an operational amplifier receiving the constant voltage on a non-inverting input; and a follower transistor controlled by the output of the operational amplifier and connected between an input of a current mirror and a first resistor connected to the first ground. It further includes a second resistor connected between an output of the current mirror and a second ground, the output of the current mirror being also coupled to an inverting input of the operational amplifier; and a filtering circuit connected to reduce or eliminate, in the output signal of the operational amplifier, any high frequency ac component with respect to the first ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.