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Subject: High-voltage high-speed gating

Date: 05/10/01 at 9:09 AM
Posted by: ohyeah
E-mail: ohyeah@po1.ctt.ne.jp
Message Posted:

I need a circuit that accepts a TTL pulse and generates
-200V pulse of the same width (min. 5nsec) for a gated
image intensifier. The output should be +30V during 'off'
time, so the output pulse height should be -230V.

I have -200V supply, so my idea is to use a high-voltage
high-speed MOSFET and a +30V supply, probably with
protection diodes for the input TTL and the +30V supply.
I considered optoisolators too, but couldn't find a fast
one.

Now my beginner's questions are:
(1) Am I on the right track? :-)
(2) Where can I find MOSFETs for 200V and 5nsec?
(3) I'm afraid that the circuit might generate huge noises.
How can I get rid of the noise problem?

I'd appreciate any advice/suggestions. Thanks.


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