Dual current control for laser diode driver circuit
Circuitry for reliably regulating the current driving a laser diode or other current-driven load is described. In particular, a dual-current driver circuit is described that uses both a current source circuit and a current sink circuit. The current source circuit and the current sink circuit may eac...
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| Main Author | |
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| Format | Patent |
| Language | English |
| Published |
31.03.2009
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| Online Access | Get full text |
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| Summary: | Circuitry for reliably regulating the current driving a laser diode or other current-driven load is described. In particular, a dual-current driver circuit is described that uses both a current source circuit and a current sink circuit. The current source circuit and the current sink circuit may each independently control the laser diode drive current within a desired operating tolerance. The current driving the laser diode will be maintained within tolerance despite the failure of either the current source circuit or the current sink circuit. This is because the current source circuit and the current sink circuit are combined with the laser diode in series, such that the current driving the laser diode will be controlled at the lower of the two currents driven by the current source circuit and the current sink circuit. |
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