PULSE MODULATING LASER DRIVER

摘要

A pulse modulated illumination source comprises at least one light emitting device, and a power source with a first and a second output terminal for generating a DC current to be supplied through said at least one light emitting device connected between said first and second output terminals of said power source. The illumination source further comprises a first controllable switching device and a first signal generator for generating a first electrical control signal for said first controllable switching device, said first controllable switching device being connected in parallel to said at least one light emitting device between said first and second output terminals of said power source. The illumination source further comprises a second controllable switching device and a second signal generator for generating a second electrical control signal for said second controllable switching device, said second controllable switching device being connected in series with said at least one light emitting device and said second control signal being out of phase with said first control signal such that said second controllable switching device opens and decouples said light emitting device from said power source when said first controllable switching device closes.