LED current source digital to analog convertor
US8716947B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2011 |
| Grant date | May 6, 2014 |
| Priority date | — |
| Expiry date | Aug 6, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Various embodiments relate to a method of producing a high precision current using N current mirrors, a feedback control amplifier, and a reference current regulator to drive a light emitting diode, including: selecting one of the N current mirrors as a first current mirror; driving the first current mirror using a reference current produced by the reference current regulator; measuring a first sense voltage at the first current mirror; measuring a second sense voltage at a second current mirror that is one of the remaining N−1 current mirrors; integrating a difference of the first sense voltage and the second sense voltage to produce a feedback signal; and driving the remaining N−1 current mirrors using the feedback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.