TINA/Spice/INA333: Unable to simulate AC transfer characteristics

JAYARAMA KAPIL SRIDHARA

Part Number: INA333
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello

I am unable to simulate AC transfer characteristics for my circuit.

I have tested the filter section separately and I am able to simulate AC transfer characteristics, I can't find where I have done wrong

The problem comes when the filter section is connected to INA333 instrumentation amplifier with gain 100 and non-inverting amplifier with gain 100.

My input is an EEG signal with 180 uV p~p.

I am attaching my circuit, Please suggest me.

eegsensor.TSC

over 6 years ago

0 Herman Theodorus over 6 years ago

TI__Genius 9775 points

Hi Jayarama,

This is convergence related challenge. Relax the convergence parameter by going to Analysis -> Set Analysis Parameters.

Increase “DC absolute current error, DC absolute voltage error, GMIN” from 1n, 1u, 1p respectively to 10n, 10u, 1n. From there keep increasing it slowly. For instance, increase it again to 20n, 20u, 2n respectively. Keep doing this until it reaches an optimum point where the simulation runs, and the simulation result is still accurate.

When I tried, I was able to use 10n, 10u and 5n.

Herman

0 JAYARAMA KAPIL SRIDHARA over 6 years ago in reply to Herman Theodorus

Prodigy 110 points

Thank you very much

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TINA/Spice/INA333: Unable to simulate AC transfer characteristics