VCO analyses

Discussion in 'Electronics Resources' started by shredability, Apr 7, 2013.

  1. shredability

    Thread Starter Member

    Apr 1, 2012
    31
    0
    [​IMG]

    I found this schematic online for this VCO (Voltage Controller oscillator) and was trying to derive an operating equation for it. I realized that your rise time of the output of the first op-amp is a function of your input, the comparator and some of the first resistances. But the discharge time is actually a function of the comparator's output and R3, this is independent of the input making the discharge time fixed. Can anyone confirm this?

    Here is some of my work:
    [​IMG]
    [​IMG]
     
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