RC oscillator and active bandpass Opamp filter

Discussion in 'Homework Help' started by xxxyyyba, Nov 19, 2015.

  1. xxxyyyba

    Thread Starter Member

    Aug 7, 2012
    249
    2
    Hello.
    Here is my task:

    osc1.png
    Here is solution:

    osc2.png

    Although solution is there, I'm stuck. Firstly, how did they find transfer function? How did they treat diodes?
     
    Last edited: Nov 19, 2015
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    From what I see they treat the diode as a ideal device with forward voltage drop 0.7V.
    Very interesting way of using GIC (General Impedance Converters) in the circuit.
    Because Zu is the impedance of an inductor L = C*R^2 = 0.484Hz.
    And this L together with C at the input form a LC circuit and F = 1/(2*pi*√LC) = 7.234kHz. And this is equally to oscillation frequency.
     
    Last edited: Nov 20, 2015
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