A 4 GHz carrier is DSB-SC modulated by a low-pass message signal with

1.	A 4 GHz carrier is DSB-SC modulated by a low-pass message signal with maximum frequency of 2 MHz. The resultant signal is to be ideally sampled. The minimum frequency of the sampling impulse train should be (a) 4 MHz (b) 8 MHz (c) 8 GHz (d) 8.004 GHz
Answer» (b) 8 MHz Given fc = 4GHz and fm = 2 MHz Such a signal is amplitude modulated (DSB-SC) i.e. two side bands = fc +fm and fc – fm = 4002 and 3998 ; BW = 4 MHz so, min. sampling frequency should be (Nyquist Rate) = 2 *4 MHz = 8MHz

A 4 GHz carrier is DSB-SC modulated by a low-pass message signal with maximum frequency of 2 MHz. The resultant signal is to be ideally sampled. The minimum frequency of the sampling impulse train should be (a) 4 MHz (b) 8 MHz (c) 8 GHz (d) 8.004 GHz

Answer»

(b) 8 MHz

Given fc = 4GHz and fm = 2 MHz

Such a signal is amplitude modulated (DSB-SC) i.e. two side bands = fc +fm and fc – fm

= 4002 and 3998 ; BW = 4 MHz

so, min. sampling frequency should be (Nyquist Rate) = 2 *4 MHz = 8MHz

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A 4 GHz carrier is DSB-SC modulated by a low-pass message signal with maximum frequency of 2 MHz. The resultant signal is to be ideally sampled. The minimum frequency of the sampling impulse train should be (a) 4 MHz (b) 8 MHz (c) 8 GHz (d) 8.004 GHz

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