Other Parts Discussed in Thread: TINA-TI, , THS3062, THS4021
Tool/software: TINA-TI or Spice Models
Dear Sean,
I have some problems about application problems about high-speed op amp from TI.
In my last post, https://e2e.ti.com/support/amplifiers/high_speed_amplifiers/f/10/t/652730, I had doubt about the big mismatch between datasheet and the simulation results in terms of THS4631’s capacitance load drive performance. And I’m replied that the experiment data should be followed. I have 2 problems to consult you.
1.About capacitive load drive performance. In my application, I’ll connect op amp’s output to NPN-PNP pairs (emitter-follower configuration). Since NPN-PNP pairs' base can be modelled as a capacitor up to 10nF and TINA-TI’s simulation results can't be trusted, what can I do to evaluate the capacitance driving performance (compensated by isolated resistor)? Is it necssary that I buy an evaluation board?
2.I totally have no experience in high-speed op amp use. But due to the easy implementation and pure resistive external components of noninverting and inverting gain configuration, I have confidence in using them. As to analog PI(proportion-integration), which involves the use of capacitor in the feedback network and maybe other compensation capacitors for circuit stability, I fear that I can’t do this job. Can you please offer instructions to help me with PI application with high-speed op amp (THS3062, THS4631 and so on)?
Best regards!
Yatao