Verification of Hardware low pass filter circuit with simulation

Discussion in 'Analog & Mixed-Signal Design' started by viraj.dali, May 10, 2017.

  1. viraj.dali

    Thread Starter Member

    Oct 20, 2016
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    Hallo
    I have simulated the analog low pass filter in the LTSpice. Also after simulation is perform I have created a filter circuit on the breadboard. My question is how can I verify the output of breadboard circuitry with Simulation. Because simulation output is in Bode plot and breadboard output on oscilloscope is just the voltage against time.
    Can someone please suggest me how can I verify it ???


    Thank you in advance
     
  2. Papabravo

    Expert

    Feb 24, 2006
    12,189
    2,681
    Sure. Here is what you do.
    1. Set the initial frequency and amplitude (Ain) of the input signal.
    2. Measure the output amplitude (Aout) and record the value.
    3. Change the input frequency
    4. Goto step 2 if input frequency is less than the maximum frequency of interest, else goto step 5
    5. For each data point compute 20*log(Aout/Ain) versus frequency and you have your result.
     
    EM Fields likes this.
  3. viraj.dali

    Thread Starter Member

    Oct 20, 2016
    36
    0
    Thank you
     
  4. viraj.dali

    Thread Starter Member

    Oct 20, 2016
    36
    0
    Hallo
    Can you please suggest how can I verify the bode of phase vs Frequency ??

    Thank you
     
  5. Papabravo

    Expert

    Feb 24, 2006
    12,189
    2,681
    Sure. On a dual trace scope you can superimpose the images at a frequency where there is zero phase shift. As you increase the input frequency you will see the phase shift. With delayed sweep you can zoom in to get a better view of the shift.
     
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