Introduction To Digital Electronics

Introduction:

Digital electronics is a field of electronics in which we study about digital signal and the devices through which digital signals are produced or in which these are used.

Let’s know more about signal:

Any function that transmits information from one source to another is said to be a signal. For electronics and telecommunications, the signal is a time-varying electromagnetic wave which conveys data.

In Electronics, Signals can be classified as:

• Analog signal
• Digital signal

Analog Signal

A continuous signal denoted by a sine wave, which represents a time-varying quantity, is called an Analog Signal. Analog signal varies with respect to time, according to the instantaneous values of the quantity, which represents it.

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Digital Signal

A digital signal is a non-continuous signal that has individual values as if derived at that particular instant of time. It is a must for computer processing as so it uses binary (0s and 1s), and hence, it cannot take any fractional values.

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In Digital Electronics, We will discuss the following units and every topic under these sections in detail:

Fundamentals of digital systems and logic families: In this section, we will talk about digital signals, digital circuits which consist of logic gates: basic gates, universal gates and more. We will also learn about different number systems and their arithmetic, and different codes used in digital electronics.

Combinational digital circuits: This section includes standard representation for logic functions, K-Map and simplification of logic functions using K-Map, their minimization and don’t care conditions. It also includes a multiplexer, demultiplexer, adders, subtractors, encoders and decoders. We have ALU, parity generator, code converters and Q-M method of function realization.

Sequential circuits and systems: This section will describe latches, different types of flip flops and their applications, shift register and its applications. Also, we will get to know about Sequence generator, counters( asynchronous and synchronous), its design using flip flops and their applications.

A/D and D/A Converters: This section at first covers digital to analogue converters that include weighted resistor/converter, R-2R Ladder D/A converter, specifications for D/A converters, examples of D/A converter ICs, sample and hold circuit. Secondly, it covers analogue to digital converters that include quantization and encoding, parallel comparator A/D converter, successive approximation A/D converter, counting A/ D converter and dual slope A/D converter.

Semiconductor Memories and Programmable logic devices: In this section we will discuss Memory organization and operation, expanding memory, classification and characteristics of memories, sequential memory, ROM, RAM, CAM, ROM as a PLD, PLA, PAL, CPLDS and FPGA.