Study on the PFM and PWM driver circuit of LD for laser fuze

Because of the needs of variable pulse width, variable frequency and variable power of LD in the laser fuze communication systems, a model of the driver circuit is brought out for the system based on the circuits’s principle. Using retriggerable monostable multivibrators to provide the trigger signal and double MOS driver to drive the LD, with a lot of experiments, emulations and comparisons, the variable frequency, pulse width and power driver circuit is designed. And the pulse frequency and width can be changed easily for its situations. The dirver circuit has large range frefuency modulated from 10Hz to 2kHz and large range pulse width modulated from several nanoseconds to several hundreds nanoseconds. So the whole system capability and reliability can be improved greatly.