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TINA/Spice/OPA376: OPA376 Transient Analysis with Tina-TI

Part Number: OPA376
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi,

By doing Transient Analysis with "OPA376_sboc261d.tsc" for 3 input voltage sources of Sine, Triangular & Square waves in Tina-TI, the simulated waveforms are as attached. However, there is big distortion on the output waveforms (marked in red circles) if the input sources are Triangular & Square waves. Would you please check why?

Thanks.

Ming

  • Ming,

    You could try to constrain the max step size.

    Go to Analysis >> Set Analysis Parameters >> Change "TR maximum time step" to say 100n or so.
  • Ming,

    I suspect the distortions are due to a transient simulation time steps that are too big.
    The default max step size can be seen in the table at  Analysis/Set Analysis Parameters.
    The default setting for the TR Maximum Time Step is "10G" which is an adaptable step size that changes from step-to-step.

    The distortion disappears if the "10G" is changed to a smaller fixed max time step, like 1 micro-second (1u).
    Please give this a try and let me know if you still see the problem.

    Regards,
    John

  • Hi John,
    It looks not helpful to set TR Maximum Time Step to 1000G or even 1000T, but it looks OK to just set TR truncation error factor to 1 from 8.
    Thanks for showing me the way of where to change the parameters.
    Ming