EC8394 ADC 2marks 16marks, Analog Digital Circuits Question Bank, ADC Short Answers


EC8394 ADC 2marks

Anna University Regulation 2017 IT EC8394 ADC 2marks & 16marks for all 5 units are provided below. EC8394 ADC Short answers, Question Bank for Analog Digital Circuits Engineering are listed down for students to make perfect utilization and score maximum marks with our study materials.


1. Define pulse Amplitude modulation.
In pulse amplitude modulation, analog signal is sampled and converted to fixed length, serial binary number for transmission. The binary number varies according to the amplitude of the analog signal.

2. What is meant by Nyquist rate and Nyquist interval?
The minimum sampling rate of 2W samples per second for a bandwidth ‘W’ hertz is called Nyquist rate. The reciprocal of Nyquist rate is called Nyquist interval.

3.Define dynamic range.
Dynamic range is the ratio of the largest possible magnitude to the smallest possible magnitude. Mathematically, dynamic range is
DR= Vmax/Vmin

4. State sampling theorem.
A band limited signal of finite energy, which has no frequency components higher than ‘W’ Hz can be completed in its samples and recovered back if the sampling frequency fs >= 2W.

5.What is aliasing? Name the two methods to avoid it.
When the signals are sampled at the rate less than Nyquist (i.e. fs > 2W), then aliasing takes place. Aliasing can be reduced by
(a) Sampling at a rate higher than Nyquist rate. fs >= 2W.
(b) By using a pre-alias filter (low pass filter) during sampling to restrict frequencies of signal to W hertz.

6. Define Quantization.
Quantization is the process of converting an infinite number of amplitude levels to finite number. In essence quantization is the process of rounding off the amplitude of the samples to a manageable number of levels.

7. What do you mean by PCM?
PCM is essentially an analog to digital conversion process, where the information contained in the instantaneous sample of analog signal are represented by digital codes and are transmitted as a serial bit stream.


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