GATE IN · 2019 · IN
Question 54: Communication and Optical Instrumentation
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Question 54
INNAT2 marksNeeds review
A signal
has a bandwidth
about a carrier frequency of
GHz as shown in Figure (a) below. In order to demodulate this signal, it is first mixed (multiplied) with a local oscillator of frequency
GHz, and then passed through an ideal low-pass filter (LPF) with a cut-off frequency of 2.8 GHz. The output of the LPF is sent to a digitizer ADC with a sampling rate of 1.6 GHz as shown in Figure (b) below. The maximum value of
so that the signal
can be reconstructed from its samples according to the Nyquist sampling theorem is ______ MHz. 
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2019IN
GATE IN 2019 · Paper 1
Instrumentation Engineering · Original paper archive
- Section
- Instrumentation Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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