OPA3S328: Error message while simulation in PSPICE for IC OPA3S328

ketan v

Prodigy 10 points

Part Number: OPA3S328

Tool/software:

I am new to PSPICE simulation tool and getting an error message while simulation in PSPICE.

And the circuit is

Request you to provide the solution

3 months ago

0 Gerasimos Madalvanos 3 months ago

TI__Mastermind 30931 points

Hello Ketan,

This can be fixed by providing connections to the pins that are highlighted in green. You can place a net label pin by pressing G, then scrolling down to the VCC_BAR/CAPSYM. This can then be placed on the pins and given an arbitrary (but unique for each pin) name, and it should be able to work. However, for the GND pin, I would connect that to GND.

Best,
Gerasimos

0 ketan v 3 months ago in reply to Gerasimos Madalvanos

Prodigy 10 points

Thank you, Gerasimos. I did the suggested changes but still getting errors.

0 Gerasimos Madalvanos 3 months ago in reply to ketan v

TI__Mastermind 30931 points

Hello Ketan,

It seems you are required to configure amp-B. I would connect INB- to OUT and INB+ to some voltage between VCC and VEE. Additionally, it seems you are grounding IN+ of amp-A, and forcing 500mV on IN-. This will cause the output to rail low. Is that your intended function?

Best,
Gerasimos

0 ketan v 3 months ago in reply to Gerasimos Madalvanos

Prodigy 10 points

Hi Gerasimos,

We wanted to use only single Opamp (AMP-A). Other Opamp (AMP-B) is not required in our application. What needs to be done for the NC (Not Connected) pins of (AMP-B).

And will recheck the circuit for inverting amp/ non-inverting amp function.

Regards,

Ketan

0 Gerasimos Madalvanos 3 months ago in reply to ketan v

TI__Mastermind 30931 points

Hey Ketan,

https://www.ti.com/lit/ab/sboa204a/sboa204a.pdf

Please see the above application note for how to configure the unused amplifier. Even if just one amplifier is needed, you must configure the other amplifier in a linear range, or there may be excess current consumption or at worst, damage to the device.

Please make sure that a valid input and output common mode range is considered. If the input is connected to GND (easiest, but will not have valid output common-mode range), it is recommended that you add at least a 1k series resistor from the input to GND, to limit current in the case of a GND bounce.

Best,
Gerasimos

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OPA3S328: Error message while simulation in PSPICE for IC OPA3S328