Question

Design a phase shift oscillator to oscillate at 2 kHz using an OPAMP. Given C=0.1

µF.

Answer 1

A 3-stage RC shift oscillator is required to produce an oscillation frequency of 2 kHz

$f=\frac{1}{2\pi\>RC\sqrt{2N}}$

$2=\frac{1}{2\pi\>R(0.1×10^{-6})\sqrt{2×3}}$

$R=\frac{1}{2\pi×2×10^3(0.1×10^{-6})\sqrt{6}}$

$=324.9\Omega$

The resistor in each stage should have a resistance of $324.9\Omega$

And a capacitor of $0.1\mu$ F