I'm going to build such a thing. However for the 3206 MSO.
Please consider a standard non inverting opamp circuit with regular voltage feedback. The signal from the 3206 function generator is feed to non inverting input.
How about the correct termination resistor in this scenario? The output impedance of the function generator is 600 ohm. Coax cables are usually 50 or 75 ohm.
So how to solve this without any compromises to signal integrity? Attenuation is not such a problem because I can compensate for that. Especially with decompensated opamps which are not unity gain stable.
The 600 ohm was chosen to prevent damage during short circuits right? The thing can at least deliver 2 / 600 = 3.3 mA correct?
I hope to hear from you!