Hi,
I'm trying to build a fast (100 to 200 MHz) digital storage oscilloscope. I was able to find RAM and ADC's with the speed I needed. I'm currently researching the input circuitry, which I believe is the limiting factor. I'm looking for the circuitry required to interface the raw input to the ADC. I believe that I need an op amp to scale the signal down. I simply can't find a fast enough scaling circuit. Is the op-amp bandwith the same as its propagation delay? Is an op amp necessary for a very fast scaling circuit? Is there an alternative?
Thanks in advance!
Hani A.
I'm trying to build a fast (100 to 200 MHz) digital storage oscilloscope. I was able to find RAM and ADC's with the speed I needed. I'm currently researching the input circuitry, which I believe is the limiting factor. I'm looking for the circuitry required to interface the raw input to the ADC. I believe that I need an op amp to scale the signal down. I simply can't find a fast enough scaling circuit. Is the op-amp bandwith the same as its propagation delay? Is an op amp necessary for a very fast scaling circuit? Is there an alternative?
Thanks in advance!
Hani A.