Coupling high voltage to low voltage stages

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predator89

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I want to connect a high voltage output stage to low voltgae input stage of 2 stage op amp.
Can anyone suggest me which output stage topology would be better for this.
 

Common source with a resistor load will give the maximum swing.
 

crutschow said:
Need more info on what you are trying to do with the circuit.
Click to expand...

I am trying to build a high voltage amplifier. And i started with a low voltage input stage with supply of 3.3 V and want to connect it to high voltage output stage. So that i can get a swing of 0 to 40V AC for the input of 0 to 3 V AC.
So i have difficulty in deciding which topology to go for.
 

crutschow said:
The frequency response required?
Click to expand...

I need a gain of 10X .. and phase margin of 60 and GBW of 1 MHz.
My idea was to implement opamp and then try using negative feedback to control gain.
 

GBW doesn't tell me the frequency response required at the output.
Don't tell me what you think you need, tell me what you actually need.
 

You need a diff amp circuit to convert the high o/p voltage into something your low voltage opamp can deal with, search the net, plenty of examples...
 

I think you at least must give the input frequency, is it fixed or variable.
 

I do not think you want to connect a high voltage output stage to a low voltage input stage. That is saying it backwards.
I think you have an input stage that operates from a 3.3V supply and you want it to drive an output stage that has a much higher output voltage swing.

You said you want the input to be 0V to 3VAC but you did not say 3V RMS or 3V p-p. What is it?
You said you want an output swing of 40V but did not say 40V RMS or 40V p-p. What is it?
 

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