Drive circuit for a solid state optical emitter device

Details Drive circuit for a solid state optical emitter device Drive circuit for a solid state optical emitter device

H - Electricity

01

S

H01S 3/10 (2006.01) H01S 3/00 (2006.01) H01S 5/042 (2006.01) H05B 33/08 (2006.01) H01S 5/068 (2006.01)

Patent

CA 2247699

The present invention relates to a circuit for driving a solid state optical emitter device such as a laser diode, and in particular a circuit which limits the maximum current which may be drawn through the device. The circuit comprises a current supply path and a current return path to which the optical emitter may be connected, and current limit means (20) to limit a maximum current (Imax) that may flow through one of the current paths. The current limit means (20) has a current mirror with an input portion (21) and an output portion (23), the circuit being arranged so that when a first current (I R) flows through the input portion (21) the second portion (23) is predisposed to supply a second current (I O) up to a maximum which mirrors the first current (I R). The maximum current (Imax) through the paths is thereby limited in accordance with the maximum of the second current (I O).

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