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how can i record the output voltage against a range of frequencies ?

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  • #2 21679484
    David Ashton
    Anonymous  
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  • #3 21679485
    NYAME EPHRAIM MECHANE
    Anonymous  
  • #4 21679486
    NYAME EPHRAIM MECHANE
    Anonymous  
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    NYAME EPHRAIM MECHANE
    Anonymous  
  • #6 21679488
    Elizabeth Simon
    Anonymous  
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  • #7 21679489
    David Ashton
    Anonymous  
  • #8 21679490
    PeterTraneus Anderson
    Anonymous  

Topic summary

The discussion addresses methods to record output voltage across a range of frequencies in electronic circuits, particularly involving op-amps. It is suggested to perform frequency sweeps by running multiple simulations at discrete frequencies (e.g., 1 kHz, 2 kHz, 4 kHz, up to 512 kHz) and recording output voltage values to build a data table for plotting gain versus frequency. The importance of specifying the op-amp model is noted, as different devices yield varying frequency responses. Analytical hand calculations are recommended to complement simulations, focusing on the relationship between input voltage and output voltage, and understanding the frequency at which the closed-loop gain drops by 3 dB due to the op-amp’s open-loop gain characteristics. For simulation, frequency-domain analyses such as AC analysis or Bode plot simulations are preferred over transient/time-based simulations. LTspice is mentioned as a professional, free simulation tool supporting these analyses. Practical advice includes adjusting feedback resistor values (e.g., from 100 kΩ to 10 kΩ) to observe changes in gain and frequency response.
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