I need an urgently answer.
I want to place a ultra low distortion op amp to buffer the output of a high speed 14Bit-DAC as below:
The output frequency is DC-50MHz.
if I want to have the maximum CMRR I should minimize any mismatch between the Rg and Rf.
on the other hand i want to have the maximum SFDR.
can I use a resistor network instead of Rf and Rg?
I found some kinds of such networks from Vishay and other companies.
the network mismatch is only 0.01%. the resistor inside the Network are completely isolated.