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 ?