PSPICE-FOR-TI: How to pursure noise analisys

user4779049

Expert 2425 points

Part Number: PSPICE-FOR-TI
Other Parts Discussed in Thread: INA350

Hi Team,

Please help me resolving my problem.

am trying to run a noise simulation using PSpice for
TI, but the simulation is failing due to an error.
Please help.

I am designing a circuit that converts load cell output
into an electrical signal using the INA350-D50.

When I attempted to run a noise simulation in PSpice for TI,
the simulation was rejected because the signal source was
not an "Independent Source."

Even after replacing it with an Independent Source
(specifically, a sine wave source), the error persists.
My simulation profile settings are as follows:

Mita

17 days ago

0 Jacob Nogaj 16 days ago

TI__Mastermind 18106 points

Hey Mita,

Thanks for reaching out.

Is the goal to obtain output referred noise over frequency for the entire circuit?

Do you mind sharing the project with me in Pspice? I would be happy to take a look at the files.

Thanks,

Jacob

0 user4779049 16 days ago in reply to Jacob Nogaj

Expert 2425 points

Jacoban,

Yes, my goal is to predict the noise appearing at the output
of this circuit. Although the design specifies 1 Hz,
I would like to know the noise characteristics in the 0.1 Hz
to 1 kHz range. I have attached the compressed project file.

Mita

Project10.zip

+1 Jacob Nogaj 16 days ago in reply to user4779049

TI__Mastermind 18106 points

Hi Mita-san,

Here is the output from your simulation, where the top plot is output referred voltage Nosie spectral density in uV(RMS), and the bottom plot is integrated noise in uV(RMS)

As for the correction in simulation, my edit was very small.

In simulation settings, we need to specify V(VOUT) as our output rather than just VOUT.

Please let me know if you have any questions regarding the simulation or the INA350.

Thanks!

Best,

Jacob

0 user4779049 14 days ago in reply to Jacob Nogaj

Expert 2425 points

Jacob-san,

Thank you for the answer.

I apologize for the delay in replying.

Mita

0 Jacob Nogaj 14 days ago in reply to user4779049

TI__Mastermind 18106 points

Hi Mita-san,

No problem at all, please reach out if we can help with anything in this design.

Thanks,

Jacob

Amplifiers

Amplifiers forum

PSPICE-FOR-TI: How to pursure noise analisys