Probably no single issue faces more high-speed signal path designers (and supplier support teams) than the risk of instability in higher speed op amps and fully differential amplifiers (FDA).
The more recent Fully Differential Amplifiers (FDA) offer both CFA and VFA versionsThe CFA based versions will also have poor DC accuracy while more recent “precision” VFA based FDAs can provide much improved DC accuracy. Those VFA-based FDAs do come with some added DC error sources beyond the typical op amp terms that will be described here
This part 3 will progress through the different VFA approaches with Part 4 moving on to CFA and FDA DC precision considerations
Here, we will pick I/O range options for the remaining two most popular high-speed amplifier types: High Speed CFAs and FDAs