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A Challenging High Rep. Rate Pulse Generator

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Highcircuit

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One of my friends is trying to design a very powerful pulse generator, the requirements are:
1.Amplitude: 0~+10,000V
2.Pulse width: <=1ns
3. Rep. Rate: >=1MHz
This is a bit of challenging task, does any fellow have interests to give some opinions. I thought about a lot of options, but nothing seems work.
 

Hi,
Means it + 10V or KV?
Which load impedance?
K.
 

10,000V has to be read as 10 kV, otherwise it would be state of the art.
Load impedance is a good question, I assume 50 ohm for the time being.
 

FvM said:
10,000V has to be read as 10 kV, otherwise it would be state of the art.
Load impedance is a good question, I assume 50 ohm for the time being.
Click to expand...
Ok, just ;-) 2kW of output power! Here's a 10 year old paper describing solid state switching of such voltages and currents. State of the art, then, was 400Hz and 10µs pulse duration. Maybe 10kHz and 1µs pulses could be feasible nowadays?
 

Yes,
Keith is right_ for 2MW peak pwr...
Nice project, to switch it in maybe 200psec!? :cry:
K
 

ESD test generators actually achieve nearly this order of magnitude in fast contact discharge mode - regarding rise time and voltage respectively peak power. But the repetition rate is much lower, of course.
 

keith1200rs said:
Isn't that 2MW?!
Keith
Click to expand...
I calculated integrated power, not pulse peak power.
erikl
 

The load is a 50ohm antenna. The amplitude is 10kV.
 

FvM said:
ESD test generators actually achieve nearly this order of magnitude in fast contact discharge mode - regarding rise time and voltage respectively peak power. But the repetition rate is much lower, of course.
Click to expand...
Sorry Frank!
I can not agree; the rise time of an ESD-Testpulse is (as I know) NOT LESS 1 NANOSEC!
K.
 

Contact discharge achieves 0.2 to 0.3 ns according to manufacturer information, e.g. from emtest. It's offered with special fast relays
dedicated to fast ESD pulses beyond standard test specifications. But it doesn't help for the discussed problem. You can at best generate a
single pulse from the contact discharge rising edge by feeding it to a shorted transmission line. Also other possible candidates
for multi kV, sub-ns pulses, particularly optical triggered switches suffer from low repetition rates (and limited liftetime, too). So I
just can emphasize my initial statement,
 

Hi Frank
They are than some super new relays because self a Reed has switching time of ca. 0.5 msec, otherwise semiconductors dont has high Voltage...
What are they than for a kind of relay pls?
K.
 

Wow, that would be some project! 1 MHz pulse rate?

If I had to do something like that, I would probably investigate light controlled squibs as the switches. They can hold off a lot of voltage becasue they are basically insullators until a strong laser light pulse hits them, then they become electrical short circuits.

I would make up some sort of ring of storage capacitors, which charge up at a slower rate, and use the squibs to fire off one capacitor after another, clockwise, getting the fast pulses. You would need some interesting capacitors with very low esr to get anything like that pulse width. If you wanted longer pulses, maybe lengths of coaxial transmission line charged up to 10 KV each, again in a rotating ring.
 

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