OPA1678: TINA simulation

Roy Chou1

Genius 16190 points

Part Number: OPA1678
Other Parts Discussed in Thread: TINA-TI

Tool/software:

Hi Team,

I am trying to simulate the AC analysis via TINA. But met the issue. How can I use the differential signal as input?

opa-filter - autosave 25-01-23.TSC

Regards,

Roy

8 months ago

0 Luis Chioye 8 months ago

TI__Guru 55466 points

HI Roy,

Attached is the revised simulation file. I used two voltage controlled voltage sources to generate the fully-differential input signal. You can set the VICM supply to the required input common-mode voltage.

See attached.

Please let me know if you have questions.

TINA-TI File:

opa-filter -forum_1-23-2025.TSC

Thank you and Kind Regards,

Luis

0 Roy Chou1 8 months ago in reply to Luis Chioye

TI__Genius 16190 points

Hi Luis,

Thank you. May you let me know how you simulate the VG1 and Vout?

In addition, how you determine the VG1 frequency? Thank you.

Roy

0 Luis Chioye 8 months ago in reply to Roy Chou1

TI__Guru 55466 points

Hi Roy,

In this case, I performed a transient simulation using a 1kHz source; but you will need to change the frequency per your signal requirements; I only copied your circuit. If you need to determine the small-signal BW frequency response, you can perform an AC small-analysis.

You can perform a transient simulation from the top menu, as shown below: