Re: DCO/VCO Fine clock output?

Use an op-amp. Feedback resistor R1 from output to Inv Input
Shunt resistor R2 from Inv input to gnd.
Positive feedback R3 from output to Non Inv Input.
Capacitor from Non Inv Input to ground Inv input to ground.
Let Vsat = op amp saturated output voltage.
Let Vref = voltage at Inv input with op amp saturated.
Then Vref = VsatR2/(R1+R2)
Let Vs = Vsat + Vref.
Let f = frequency of oscillation.
f = 1/{2 Tau ln[(Vs-V)/Vs)]}
Wwher ln(X) means "natural logarithm of X".

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