Circuit for producing 10ns pulses of several amps

On Mon, 23 Jul 2012 17:50:13 -0700 (PDT), bitterlemon40@yahoo.ie wrote:

>I think the usual way to shorten the pulses is to put a low value inductor in parallel with the LED.  Therefore the current can only flow through the LED for a short while until the all the current available is shunted through the inductor instead. 

That's a pretty big inductor.  Why would you burn power unnecessarily? 

In case this has not already been cited, I have successfully used the following circuit as the laser driver in a distance measuring application

UHRING W., ZINT C.V., BARTRINGER J., 
A low-cost high-repetition-rate picosecond laser diode pulse generator, Proc. SPIE 5452, 2004, pp. 583-590, Photonics Europe 2004, Strasbourg (France), April 26-30, 2004, edited by D. Lenstra, G. Morthier, T. Erneux, M. Pessa, ISBN 0-8194-5375-7. Lien 

JohnR

jc.al.robbins@gmail.com wrote:
> In case this has not already been cited, I have successfully used the
> following circuit as the laser driver in a distance measuring
> application
> 
> UHRING W., ZINT C.V., BARTRINGER J., A low-cost high-repetition-rate
> picosecond laser diode pulse generator, Proc. SPIE 5452, 2004, pp.
> 583-590, Photonics Europe 2004, Strasbourg (France), April 26-30,
> 2004, edited by D. Lenstra, G. Morthier, T. Erneux, M. Pessa, ISBN
> 0-8194-5375-7. Lien
> 
> JohnR


Thanks.  I'll try to get my hands on that.  My work library should be
able to provide it.

I also have this bookmarked, but haven't gotten it yet:

http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F7361%2F5752398%2F05643093.pdf%3Farnumber%3D5643093&authDecision=-203



-- 
_____________________
Mr.CRC
crobcBOGUS@REMOVETHISsbcglobal.net
SuSE 10.3 Linux 2.6.22.17

legg wrote:
> On Sat, 21 Jul 2012 00:12:11 -0500, legg <legg@nospam.magma.ca> wrote:
> 
>> On Fri, 20 Jul 2012 10:52:32 -0700, "Mr.CRC"
>> <crobcBOGUS@REMOVETHISsbcglobal.net> wrote:
>>
> <snip>
>>> I wish to achieve 10-20ns pulses of 1-10 amps.
>>>
> <snip>
>> Some fairly short, high current pulses can be harvested as
>> cross-conduction phenomena in (unloaded) gate drive circuits - their
>> periods being equivalent to the rise or fall time of the pre-driver
>> output.
>>
>> Problems with this include stray inductance in the current path,
>> minimum capacitive loading of the pre-driver, headroom/gate threshold
>> relationships and techniques in tailoring the current fall time. Using
>> discrete parts, the cross conduction can be intentionally manipulated.
> 
> Talking to myself, it seems.

Thanks for your reply.  I saw it but the idea seemed a bit obscure for
my to spend time on.  My limitation, not yours.

I'll have a look at your sim below, but it may take me a couple days...


> A quick LTspice simulation follows, using the cross-conduction alone.
> 
> RL
> 
> [edit]


Thanks for the consideration!


-- 
_____________________
Mr.CRC
crobcBOGUS@REMOVETHISsbcglobal.net
SuSE 10.3 Linux 2.6.22.17