Digital Electronics : Digital Electronics Presentation on
Introduction to Digital Electronics
Presented By : Parag Parandkar
Assistant Professor, Chameli Devi School of Engg., Khandwa Road, Indore (M.P.), India – 452020
Email: , parag.vlsi@gmail.com, parag.parandkar@cdgi.edu.in
Contact: +919826139931
Representation of Information : Representation of Information Digital Electronics represents information (0, 1) with only two discrete values.
Ideally “no voltage” (e.g., 0v) represents a 0 and “full source voltage” (e.g., 5v) represents a 1
Realistically “low voltage” (e.g., <1v) represents a 0 and “high voltage” (e.g., >4v) represents a 1
We achieve these discrete values by using switches.
We use transistor switches, which operates at high speed, electronically, a small in size.
Analog versus Digital : Analog versus Digital Analog is Continuous while Digital is Discrete.
Analog systems process time-varying signals that can take on any value across a continuous range of voltages (in electrical/electronics systems).
Digital systems process time-varying signals that can take on only one of two discrete values of voltages (in electrical/electronics systems).
Discrete values are called 1 and 0 (ON and OFF, HIGH and LOW, TRUE and FALSE, etc.)
Benefits of Digital over Analog : Benefits of Digital over Analog Reproducibility
Not effected by noise means quality
Ease of design
Data protection
Programmable
Speed
Economy
Digital Devices : Digital Devices Combinational Devices: Gates
Sequential Devices: Flip-Flops
PLDs
FPGAs
Gates : Gates The most basic digital devices are called gates.
Gates got their name from their function of allowing or blocking (gating) the flow of digital information.
A gate has one or more inputs and produces an output depending on the input(s).
A gate is called a combinational circuit.
Three most important gates are: AND, OR, NOT
Electronic Aspects of Digital Design : Electronic Aspects of Digital Design How we represent digital information in electronic devices?
By discrete voltages.
What is the Basic Digital Element in Electronics ?
A Switch
Logic levels : Logic levels Undefined regionis inherent
digital, not analog
Switching threshold varies with voltage, temp
need “noise margin”
Logic voltage levels decreasing with new processors.
5 , 3.3 , 2.5 , 1.8 V
Software Aspects of Digital Design : Software Aspects of Digital Design Today software tools are an essential part of digital design.
Software tools improve productivity, correctness and quality of designs
Software tools are:
Schematic entry
HDL (Hardware Description Language) Editors
Simulators - to verify the behaviour of the design
Synthesis tools - circuit design
Timing analyzers and verifiers