Indicate which of the following statements about the advantages of the phase discriminator over the slope detector is false:

Solution (By Examveda Team)

A phase discriminator is a type of demodulator used in communication systems, particularly for phase modulation (PM). It converts the phase variation of the received signal into an amplitude variation that can be easily detected. A slope detector, on the other hand, is used for frequency demodulation and detects frequency deviations by looking at the slope of the frequency response.

The correct answer is Option C: Greater limiting. A phase discriminator does not provide greater limiting compared to a slope detector. Limiting refers to the process of reducing the effect of amplitude variations in the received signal, ensuring that the demodulator only reacts to the phase or frequency variation. Slope detectors are generally better at limiting because they can handle amplitude variations more effectively than phase discriminators.

Why the other options are correct:
Option A: Much easier alignment – Phase discriminators are generally easier to align than slope detectors because they are less sensitive to variations in signal amplitude, making the alignment process more straightforward.

Option B: Better linearity – Phase discriminators tend to have better linearity over a wider range of input frequencies, meaning the relationship between input phase and output signal is more consistent compared to slope detectors.

Option D: Fewer tuned circuits – Phase discriminators typically require fewer tuned circuits than slope detectors, which often require more complex circuitry to ensure proper frequency response for demodulation.