engineering recuitment GATE ECE 2023-24 Test Series Communication Systems Receivers Classification of Receivers
Consider the block diagram of the mixer shown in the figure below that consists of a product modulator with a local oscillator of variable frequency fL0, followed by a band-pass filter.
The input signal is an AM wave of bandwidth 10 kHz and carrier frequency that may lie anywhere in the range of 0.535 MHz to 1.605 MHz. It is required to translate this signal to a frequency band centered at a fixed intermediate frequency (IF) of 0.455 MHz. What is the range of tuning that must be provided in the local oscillator to achieve this requirement?
1
0.08 MHz < fL0 < 1.15 MHz
2
0.535 MHz < fL0 < 1.605 MHz
3
0.99 MHz < fL0 < 2.06 MHz
4
0.08 MHz < fL0 < 2.06 MHz