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amplifier for 10MHz, either pga or dual with enable

Question asked by pchaisty on Jun 10, 2014
Latest reply on Jun 23, 2014 by harryh

Hi

 

I want to be able to feed in a signal of 2 - 8MHz and selectively amplify it by at least selectable gains of 1 and (5 or 10).

The output is going into a rms measurement chip and I want to increase the dynamic range, ie switch in some gain when the rms converter gets close to its min input level.

 

Output swing is <3V rms

 

The AD8250 would be ideal but it runs out of steam, so I suspect I could do the input stage with two input amplifiers each with an enable input ?

 

Any ideas of an op amp i could use that can disable its output ?

 

 

 

Peter

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