Lecture

Digital Logic Circuits: CMOS and Verilog Modeling

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

In course

CS-173: Fundamentals of digital systems

Welcome to the introductory course in digital design and computer architecture. In this course, we will embark on a journey into the world of digital systems, exploring the fundamental principles and concepts that underpin modern computing technology. ...

Description

This lecture covers the fundamentals of digital logic circuits, focusing on the implementation technology of CMOS (Complementary Metal-Oxide-Semiconductor) transistors. It begins with an introduction to NMOS and PMOS transistors, explaining their operation as switches and logic gates. The lecture then delves into CMOS circuit structures, highlighting the roles of pull-up and pull-down networks. The instructor discusses voltage levels representing binary values in digital circuits, emphasizing real voltage waveforms and propagation delays in logic gates. Key concepts such as fan-in, fan-out, and parasitic capacitance are introduced, along with their implications for circuit performance. The lecture also addresses power dissipation in logic gates and the importance of dynamic current flow. Finally, the instructor introduces computer-aided design (CAD) processes for digital circuits, focusing on Verilog as a hardware description language, and provides examples of structural modeling, including a full-adder and a four-bit ripple-carry adder.

Official source

Ontological neighbourhood

Electrical engineering

Electronic engineering: Digital electronics

Computer engineering

Hardware engineering: Microprocessors

Related concepts (32)

Logic gate

A logic gate is an idealized or physical device that performs a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output. Depending on the context, the term may refer to an ideal logic gate, one that has, for instance, zero rise time and unlimited fan-out, or it may refer to a non-ideal physical device (see ideal and real op-amps for comparison). In the real world, the primary way of building logic gates uses diodes or transistors acting as electronic switches.

Verilog

Verilog, standardized as IEEE 1364, is a hardware description language (HDL) used to model electronic systems. It is most commonly used in the design and verification of digital circuits at the register-transfer level of abstraction. It is also used in the verification of analog circuits and mixed-signal circuits, as well as in the design of genetic circuits. In 2009, the Verilog standard (IEEE 1364-2005) was merged into the SystemVerilog standard, creating IEEE Standard 1800-2009.

Transistor

A transistor is a semiconductor device used to amplify or switch electrical signals and power. It is one of the basic building blocks of modern electronics. It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit. A voltage or current applied to one pair of the transistor's terminals controls the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal.

Adder (electronics)

An adder, or summer, is a digital circuit that performs addition of numbers. In many computers and other kinds of processors adders are used in the arithmetic logic units (ALUs). They are also used in other parts of the processor, where they are used to calculate addresses, table indices, increment and decrement operators and similar operations. Although adders can be constructed for many number representations, such as binary-coded decimal or excess-3, the most common adders operate on binary numbers.

SystemVerilog

SystemVerilog, standardized as IEEE 1800, is a hardware description and hardware verification language used to model, design, simulate, test and implement electronic systems. SystemVerilog is based on Verilog and some extensions, and since 2008, Verilog is now part of the same IEEE standard. It is commonly used in the semiconductor and electronic design industry as an evolution of Verilog. SystemVerilog started with the donation of the Superlog language to Accellera in 2002 by the startup company Co-Design Automation.

Related lectures (64)

Transistors: Understanding Behavior and Circuits

Explores transistors, from basic concepts to circuit applications, including current sources, amplifiers, followers, and switches.

Logic Systems: TTL Gates and Analog Aspects

Explores TTL gates, analog aspects, and various logic gates in digital circuits.

BJT vs FET Operation

Compares BJT and FET operation in logic systems, discusses TTL vs CMOS technologies, and explores Set-Reset Latch functionality.

Logic Systems: Karnaugh Maps and TTL Gates

Explores Karnaugh maps, TTL gates, analog aspects of digital logic, and prime implicants.

Quantum and Nanocomputing