RC phase shift oscillator design ... ???

Discussion in 'The Projects Forum' started by rsashwinkumar, Sep 26, 2011.

  1. rsashwinkumar

    Thread Starter New Member

    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....