Lecture

Computer Architecture: Electronic Calculations with Transistors

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.

Description

This lecture introduces electronic calculations based on transistors, starting from algorithms to create an abstract machine. It discusses the independence of technology for implementation, including electromechanical, electronic, and optical possibilities. The lecture covers the functioning of transistors as controlled switches, the low cost of transistors in modern processors, and the implementation of logical circuits. It also explores the construction of various logical circuits using transistors, such as inverters and AND gates. The lecture concludes by showcasing the capabilities of processors in performing complex functions through the addition of binary numbers.

Official source

Related concepts (32)

Abstract machine

In computer science, an abstract machine is a theoretical model that allows for a detailed and precise analysis of how a computer system functions. It is similar to a mathematical function in that it receives inputs and produces outputs based on predefined rules. Abstract machines vary from literal machines in that they are expected to perform correctly and independently of hardware. Abstract machines are "machines" because they allow step-by-step execution of programmes; they are "abstract" because they ignore many aspects of actual (hardware) machines.

In mathematical logic and theoretical computer science, a register machine is a generic class of abstract machines used in a manner similar to a Turing machine. All the models are Turing equivalent. The register machine gets its name from its use of one or more "registers". In contrast to the tape and head used by a Turing machine, the model uses multiple, uniquely addressed registers, each of which holds a single positive integer.

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.

Bipolar junction transistor

A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor (FET), uses only one kind of charge carrier. A bipolar transistor allows a small current injected at one of its terminals to control a much larger current flowing between the terminals, making the device capable of amplification or switching. BJTs use two p–n junctions between two semiconductor types, n-type and p-type, which are regions in a single crystal of material.

Field-effect transistor

The field-effect transistor (FET) is a type of transistor that uses an electric field to control the flow of current in a semiconductor. FETs (JFETs or MOSFETs) are devices with three terminals: source, gate, and drain. FETs control the flow of current by the application of a voltage to the gate, which in turn alters the conductivity between the drain and source. FETs are also known as unipolar transistors since they involve single-carrier-type operation.

Related lectures (64)

Dynamic Losses in CMOS Inverters: Analysis and Design

Covers dynamic losses in CMOS inverters, focusing on energy dissipation and design considerations for efficient operation.

Scaling Trends: Parallel Hardware Evolution

Explores the evolution of parallel hardware, from Moore's Law to the challenges of the 2000s, and the shift towards scale-out systems in data centers.

Computer Architecture: Electronic Memory (Transistor-based)

Explains electronic memory in computer architecture using transistor-based circuits for data storage and retrieval.

Bipolar Transistor Principles: Historical Context and Functionality

Covers the principles and historical development of bipolar transistors, detailing their operation and significance in electronics.

Logic Systems: Karnaugh Maps and TTL Gates

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

Related concepts (32)

Abstract machine

Transistor

Bipolar junction transistor

Field-effect transistor