When does a digital phase detector can be used, where fo->output frequency, fs->input frequency.

f o should be square wave & f s can be any non-sinusoidal wave

Both fo & fs signals should be square wave

fo should be square wave & fs can be any non-sinusoidal wave

fs should be square wave & fo can be any non-sinusoidal wave

Both fo & fs can be any non-sinusoidal wave

When does a digital phase detector can be used, where fo->output frequ

1.	When does a digital phase detector can be used, where f_o->output frequency, f_s->input frequency.
A.	Both f<sub>o</sub> & f<sub>s</sub> signals should be square wave
B.	f<sub>o</sub> should be square wave & f<sub>s</sub> can be any non-sinusoidal wave
C.	f<sub>s</sub> should be square wave & f<sub>o</sub> can be any non-sinusoidal wave
D.	Both f<sub>o</sub> & f<sub>s</sub> can be any non-sinusoidal wave
Answer» B. f<sub>o</sub> should be square wave & f<sub>s</sub> can be any non-sinusoidal wave