Question

What is the phase shift in RC coupled CE amplifier at lower 3dB frequency?

(a) 180°

(b) 225°

(c) 270°

(d) 100°

I had been asked this question during a job interview.

I'm obligated to ask this question of Low Frequency Response and Miller Effect Capacitance topic in portion Transistor Frequency Response of Analog Circuits

Answer 1

Right option is (b) 225°

The explanation is: Total phase shift = 180°+ tan^-1(fL/f)

At 3dB frequency fL/f = 1

Total phase shift = 180° + 45° = 225°.