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OPA354A-Q1 OPA354 TINA-TI Reference Design (Rev. B)

Toshio Ushikubo
Mastermind 9620 points
Other Parts Discussed in Thread: OPA354, TINA-TI, OPA354A-Q1

Hello,

 

I downloaded “OPA354 TINA-TI Reference Design from OPA354A-Q1” product page.

I changed input waveform from sin wave to square wave and did transient simulation.

(using attached file)

OPA354-Q1_TINA_sboc204b.TSC

VOUT start to rise before VIN start to rise.

I think VOUT must start to rise after VIN start to rise.

 

Could you please explain the reason why VOUT start to rise before VIN start to rise.

 

Best Regards.

  • 0
    TI__Mastermind 37310 points
    Hi,

    This is an artifact from the simulation.

    With a transient analysis by default the time steps are dynamically controlled. If the signals are moving slowly, the time steps increase. When the simulator detects a change big enough that violates the tolerance settings, it goes back in time and recalculate solutions, until the instance in time where all tolerance settings are satisfied. Then it resumes simulation from that point.

    The problem here is that the big change comes from your input signal which has a 0 rise/fall time, which is not realistic. You can try gradually increase the rise/fall time and you will see this artifact lessens.

    Thanks,
    JC