anybody have ltspice model for the above circuit .it helps me to understand the concept

 

i started simulating the two stage circuit
but as per theoritical and my understanding the two stage voltage about 2*300V=600v ideally and about 400-500v practical with all parasitics
but i got the attached waveform at the load which is mV order
pl guide and help me

 

hi s129,
Welcome to AAC.
Please post your LTSpice asc file, so that we can compare results.
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Hi Sir,
thank you for your reply .The asc file attached

 

hi s129,
Please add/post the FMMT417 model.
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i used the model from diodecorp and the model attached,as per theory the first capacitor will connect in series with second capacitor the second transistor will go to avalanche and the two capacitors voltage shall come across load.
but in reality not happening. the voltage across load shown as

 

reply please

 

hi s129,
I tried various edits but could not get the transistors to Avalanche, where did you find the original circuit?
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hi s129,
This is an example showing that avalanche transistor working as expected.
The circuit is similar to the type I used in my ESP laser rangers.

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i could do the simulation by adding a capacitor at emitter of the first BJT to inhibit the avalanche

 

can i connect two 5 stage pulse generators in parallel to increase the current in the common load 50 ohm,
i could not get the double voltage at the load

 

Hi sri,
Where did you find the original circuit?

How can you expect a very high Emitter current with Collector loads of 10K?

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In one of the publication claimed the above circuit,

can you help me Gibbs to understand this and to simulate in LTSpice