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Response feedback and minimum essential analysis

vinay bhatt
Prodigy 240 points
Other Parts Discussed in Thread: OPA1679

1. I simulated OPA1679 Circuit using TINA - The transfer characterize result is attached - the output is taking time to stablise, is it normal or do I need to change something in design
?

2.  Other than AC Transfer characteristic and Transient plot using TINA, what other minimum  analysis should be done to ensure that the op amp circuit will work fine?

  • 0
    TI__Genius 11815 points

    Hi Vinay,

    Can you provide the schematic used in your TINA simulation? You may simply attach the TINA .TSC file.

    Generally, the minimum analysis for an op amp circuit includes the following:

    1. DC bias and operating point
    2. Input and output swing limitations
    3. AC transfer function
    4. Transient step response and stability

    For a robust design with high-confidence in the performance, I would also include:

    1. Power supply consideration (power supply noise, adequate decoupling capacitors, etc.)
    2. Noise analysis
    3. Input and output protection (ensure the absolute maximum datasheet ratings are never violated)
    4. PCB Layout (use best practices to ensure high performance)

    The TI Precision Labs Op Amps video series is an excellent resource that covers all of these topics in detail. Please refer to the relevant video topics found at the following link: https://www.ti.com/video/series/precision-labs/ti-precision-labs-op-amps.html 

    I do not see the AC transfer characteristic of your circuit attached, however I do see your screenshot of the transient response. If you are concerned with settling and stability, I recommend following the guidance in the TI Precision Labs topic on stability. This is a 7 video series covering stability which includes instructions on using TINA simulations to perform a robust stability analysis.

    Regards,

    Zach

  • 0 in reply to vinay bhatt
    TI__Genius 11815 points

    You're welcome Vinay. I will go ahead and close this thread for now. Feel free to reply again if you require further support on your design.

    Regards,

    Zach