Explanation: Analog phase detector is called as half wave detector because, the phase information for only one-half of the input waveform is detected and averaged. 2. What happens when VCO output is 90o out of phase with respect to input signal?
A. Perfect lock
B. Attenuation
C. Shift in phase of comparator
D. Error signal is removed
Answer:A
Explanation: Analog phase detector is called as half wave detector because, the phase information for only one-half of the input waveform is detected and averaged. 2. What happens when VCO output is 90o out of phase with respect to input signal?
A. Perfect lock B. Attenuation C. Shift in phase of comparator D. Error signal is removed
Explanation: The error voltage is zero when the phase shift between the two inputs is 90o. So, for the perfect lock, the VCO output should be 90o out of phase with respect to the input signal. 3. Find the error voltage of phase comparator whose input signal is Vs= Vssin(2πfst) and the output signal Vo= Vosin(2πfot+φ).