81. Noise with double-sided power spectral density of K over all frequencies is passed through a RC low pass filter with 3 dB cut-off frequency of fc. The noise power at the filter output is
82. A system has a receiver noise resistance of 50 Ω. It is connected to an antenna with an input resistance of 50 Ω. The noise figure of the system is
83. Noise performance of PAM is
84. A signal m(t) = 5cos2π100t frequency modulates a carrier. The resulting FM signal is 10cos{(2π105t) + 15sin(2π100t)}. The approximate bandwidth of FM would be
85. If transmitter bandwidth is doubled in FM, then SNR is
86. Consider the wave form V(t) = (1 + mcosωmt)cosωt.
Show that, it the demodulated wave is to follow the envelope of V(t), it is required that at any time t0
Show that, it the demodulated wave is to follow the envelope of V(t), it is required that at any time t0
87. Which of the following is NOT one of the type of amplitude modulation?
88. Eye diagram gives us an idea of-
89. Power spectral density of white noise . . . . . . . . with frequency.
90. In a typical frequency multiplier application using a PLL, a decade counter was inserted between the VCO output and the relevant phase comparator input. If the input frequency is 10 kHz, the VCO output frequency would be
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