RC oscillator and active bandpass Opamp filter

Thread Starter

xxxyyyba

Joined Aug 7, 2012
289
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?
 
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Jony130

Joined Feb 17, 2009
4,969
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.
 
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