Tool/software:
Hi team,
I am trying to use a LM2904B-Q1 as a voltage follower. But I found that the transient performance could be impacted by output capacitor and resistor.
My question is does this simulation matches the reality of this device? How to accelerate the response, by reducing cap and res?
Thank you!
Best,
Josh
Hi Josh,
My question is does this simulation matches the reality of this device? How to accelerate the response, by reducing cap and res?
The simulation in LM2904B-Q1 should match the reality pretty closely. The buffer's response limitation is the Riso compensation method, where 100Ω and 60nF has a pole around 26.5kHz, which it retards the output response,
LM2904B-Q1 has GBW at approx. 1.2MHz. You have to provide us the design requirements in order to answer your question. The output capacitive load is one of a factor. If you implement a dual feedback compensation method, you may have faster in step response. There are other options, but you have to tell us what is your application, and I can simulate a circuit that will meet your need.
I need to know the following parameters (minimum).
- Output capacitive and resistive loads and/or complex loads
- Output signal rise/fall timing requirements
- Input signal frequency and output voltage swing
- Op amp's supply rails
If you have other questions, please let me know.
Best,
Raymond
