Jul 10, 2007 #1 M MICROSYSTEM Junior Member level 1 Joined Apr 11, 2006 Messages 15 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,355 Hi , I need to design a 30ns 25Amp current pulse generator to drive a laser diode , the frequency is about 160 Hz , any idea how to design? Thank you!
Hi , I need to design a 30ns 25Amp current pulse generator to drive a laser diode , the frequency is about 160 Hz , any idea how to design? Thank you!
Jul 11, 2007 #2 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 To generate ≈30ns pulse you can use XOR gate with some kind of delay line (6 inverters) .. As the 74AC family have a 4.8ns propegation delay, that should provide roughly 29ns pulses. If you need wider, use more inverters (even number) .. Code: +----+ +----+ +----+ +----+ +----+ +----+ +---+ 80Hz o-----*---| -1 |o---o| -1 |---| -1 |o---o| -1 |---| -1 |o---o| -1 |---| | | +----+ +----+ +----+ +----+ +----+ +----+ | ^ |---> +---------------------------------------------------------------| | +---+ Pulses are generated at each transistion, so for 160 pulses per second you need 80Hz (50%) square wave .. To drive a Leser Diode, these pulses have to be amplified .. Attached is an example of pulse amplifier .. More details here: **broken link removed** Regards, IanP
To generate ≈30ns pulse you can use XOR gate with some kind of delay line (6 inverters) .. As the 74AC family have a 4.8ns propegation delay, that should provide roughly 29ns pulses. If you need wider, use more inverters (even number) .. Code: +----+ +----+ +----+ +----+ +----+ +----+ +---+ 80Hz o-----*---| -1 |o---o| -1 |---| -1 |o---o| -1 |---| -1 |o---o| -1 |---| | | +----+ +----+ +----+ +----+ +----+ +----+ | ^ |---> +---------------------------------------------------------------| | +---+ Pulses are generated at each transistion, so for 160 pulses per second you need 80Hz (50%) square wave .. To drive a Leser Diode, these pulses have to be amplified .. Attached is an example of pulse amplifier .. More details here: **broken link removed** Regards, IanP
Jul 12, 2007 #3 M MICROSYSTEM Junior Member level 1 Joined Apr 11, 2006 Messages 15 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,355 Thank you for your circuit. Do you know also any low voltage soloutions?