AC Equivalent of Bipolar RC Phase Shift Oscillator,
Let R = 473 + (10k // 9k // 2.5k) = 2.11kΩ
Since R = Rc, we obtain :
According to my simulation data,
f = (2πRC√10)^-1 = 0.2385 Hz = 238.5 mHz
β = (purple) / (green) ≈ 0.01955
A = gm × ( 10k // 9k // 2.5k ) = 34.5m × 1.636k = 56.442
The Loop Gain = βA = 0.01955 × 56.442 = 1.103441
