👆GATE/IES Formula book (ECE branch)🔥

Hint: Ideal low pass filter is a non causal system.

How to convert Analog signal into digital?

Ans. Analog Signal(input) → Sample & Hold circuit → Quantization → Encoding → Digital Signal (output)

Sampler takes samples i.e. records value of the analog signal at a specified time and this random values of sampled signal is quantized to defined levels and these levels are encoded by defined number of bits and thus digital signal is obtained.



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How microprocessor functions without internal memory?

Ans. Microprocessor consist of address, data and control buses with some internal registers to process the task through external memory by using certain commands to access memory locations of the external memory.


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Explain the difference between sensitivity and selectivity?

Ans. The sensitivity of an electronic device, such as a communications system receiver, or detection device, such as a PIN diode, is the minimum magnitude of input signal required to produce a specified output signal having a specified signal-to-noise ratio, or other specified criteria.

Selectivity is a measure of the performance of a radio receiver to respond only to the radio signal it is tuned to (such as a radio station) and reject other signals nearby in frequency, such as another broadcast on an adjacent channel.

In communication, the sensitivity of a communication receiver is the ability of communication receiver to satisfactorily work on weak signals while selectivity of a receiver is the characteristic that determines the extent to which it is capable of distinguishing between the desired and undesired signals.




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