Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

30ns 25Amp current pulse generator

Status
Not open for further replies.

MICROSYSTEM

Junior Member level 1
Joined
Apr 11, 2006
Messages
16
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,366
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!
 

IanP

Advanced Member level 5
Joined
Oct 5, 2004
Messages
7,942
Helped
2,310
Reputation
4,622
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:
https://joule.bu.edu/~hazen/DataSheets/Zetex/AN8.pdf

Regards,
IanP
 

MICROSYSTEM

Junior Member level 1
Joined
Apr 11, 2006
Messages
16
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,366
Thank you for your circuit. Do you know also any low voltage soloutions?
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top