question_answer 38)

  An audio signal is modulated by a carrier wave of 20 MHz such that the bandwidth required for modulation is 3 kHz. Could this wave be demodulated by a diode detector which has the values of R and C as (i) (ii) (iii)  

Answer:

                  Here, Bandwidth            Demodulation by a diode detector is possible if the condition  is satisfied. (i) Here condition  is satisfied.    Hence it can be demodulated. (ii) Here condition  is satisfied.    Hence it can be demodulated. (iii) Here, condition RC , so this cannot be demodulated.