Question

What is limitations square law demodulator?

Answer 1

Square law modulators are used for Amplitude Modulation. They have non linear current-voltage characteristics. Square law modulators are highly nonlinear in low voltage region.

Answer 2

Limitations of square law demodulator:

• Sqaure law demodulator is used to demodulate low level AM wave. This demodulator contains a square law device and low pass filter.
• The AM wave v1(t) is applied as an input to this modulator

             v1(t)=Ac[1=Kam(t)]cos(2$fct)

• The AM demodulators measures the power or amplitude of signals presented to it. This is why radio tends to suffer from breeze, whistles, crackles etc.,
• Other forms of modulation can avoid this sensitivity and are less prone to unwanted interference.