OPA333A-EP: Stability check of OPA333

Kavindu Ratnayake

Part Number: OPA333A-EP
Other Parts Discussed in Thread: OPA333, INA333

Tool/software:

Hi ,

Can you please give me some heads up how to evaluate the stability of the instrumentation amplifier configuration attached herewith.

OPA333_Stability_analysis.TSC

Thanks,

2 months ago

0 Marek Lis 2 months ago

TI__Guru 63050 points

Kavindu,

The simplest way to check for stability is to run a transient simulation by stimulating the output with a small-signal square current source and determine a precent overshoot - 25% or less overshoot assures a stable operation ( >45 degrees phase margin) - see below.

Just so you know, we have INA333 instrumentation amplifier based on OPA333 - see below.

0 Kavindu Ratnayake 2 months ago in reply to Marek Lis

Intellectual 330 points

Hi Marek,

Thank you for the useful information. But when I tried the same at this end, I got something like below. Please let me know if I have to change any settings.

Also can you please advise on selecting the frequency of stimulation.