High voltage amplifier

[rmathur]

I have to design a high voltage amplifier for an input signal +/- 10 volts p -p, 1KHz to 1MHz. I need almost flat voltage gain of 20 with the circuit. The amplifier drives a capacitive load of aprrox. 10 pF. I guess i could use an opamp with very high slew rate , but i can't find any? Does anyone has an idea how to do this?
thanks

 

[alex840]

15 years ago I've designed some similar device. It was OP77 + common base amplifier, loaded by current source and emitter follower. By nowdays you can buy it from apex, for example. **broken link removed**

 

[rmathur]

Thanks alex,
I bought PA85s from apex, but it doesn't have enough jiuce to go upto 1MHz with +/- 100 volts at the output.
Do you know of any?

 

[alex840]

look at this:
**broken link removed**

they claim 1MHz full power bandwidth