RC phase shift oscillator design ... ???

Thread Starter


Joined Feb 15, 2011
i need to design an rc phase shift osc. at a freq of 1khz (say)
the frequency of osc. for an opamp based osc., is 1/(2piRC*sqrt(6) if we use 3 rc networks.

Now i choose R and C accordingly. Now since v use 3 RC lead networks, each must be designed to produce a phase shift of 60 degrees.

but for the chosen values of R and C the phase contribution from each network turns out to be 90-arctan(1/sqrt(6)) which does not give 60 degrees.

plz let me know where i have gone wrong....