I am attempting to design an amplifier system with a variable gain between 1 and 100 and a -3dB bandwidth of 100MHz (min). I intend on using multiplexers for the switching mechanism. Based on my research, I have decided to use a setup similar to an Instrumentation Amplifier setup. I also want to limit the number of amplification stages to 3.

I understand how to design the system as shown at http://en.wikipedia.org/wiki/File:Op-Amp_Instrumentation_Amplifier.svg, however, I am having trouble finding the right amplifier(s) to accomplish my goals.

Does anyone have any suggestions?

 

100 mhz bandwidth at what center frequency?
look into MMIC amplifiers with a 50 ohm variable attenuator between two.

 

And what initial input voltage?

 

Sorry, the signal input is DC to 100 MHz into an ADC sampling at 250 MSPS. I want to be able to represent signals from 10mV to 3V peak.

 

I was looking at my design/reviewing datasheets when I realized I was going about the design from the wrong direction and decided to take a different route.

Thanks alfacliff for the suggestion on MMICs. I looked at them and realized they could be vary useful and will consider using them in a different design.

If I still need help with the original question, I will let everyone know.