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MindMap Gallery Basics of digital electronic technology (gate circuits) mind map

Basics of digital electronic technology (gate circuits) mind map

"A Concise Tutorial on the Basics of Digital Electronic Technology" Tsinghua University. Yu Mengchang. Fourth Edition (Chapter 2: Gate Circuits), electronic circuits that implement basic and commonly used logical operations are called logic gate circuits.

Edited at 2023-11-30 19:31:05

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Basics of digital electronic technology (sequential logic circuits)
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Digital Electronics Technology Basics

Chapter 2 Gate Circuit

Overview

Concept: Electronic circuits that implement basic and commonly used logic operations are called logic gate circuits.

High and low levels and positive and negative logic

Positive logic: high level represents logic 1, low level represents logic 0

Negative logic: high level represents logic 0, low level represents logic 1

Discrete component gates and integrated gates

Discrete component gate circuit: A gate circuit composed of discrete components and wires connected together.

Integrated gate circuit: The components and connections that make up the gate circuit are made on a semiconductor chip, and then packaged to form an integrated gate circuit.

The degree of integration of digital integrated circuits: Generally, the number of equivalent logic gates or components contained in a chip is defined as the degree of integration.

2.1 Switching characteristics of semiconductor diodes, transistors and MOS tubes

Ordinary switch: good static characteristics, poor dynamic characteristics

Semiconductor switch: poor static characteristics, good dynamic characteristics

Semiconductor transistor

Features: Switching element with amplification capability and controlled by base current

MOS tube

Structure and properties

Switching performance of MOS. tube

2.2 Discrete component gate circuit

Diode AND gate and OR gate

Diode AND gate:

Diode OR gate:

Transistor NOT gate (inverter)

Semiconductor transistor NOT gate

Circuit diagram:

Logical parameters:

MOS transistor NOT gate

Circuit diagram:

Logical symbols:

Truth table:

2.3 CMOS integrated gate circuit

CMOS: complementary metal oxide semiconductor

CMOS inverter

Circuit diagram:

working principle:

CMOS NAND gate

Circuit diagram:

working principle:

CMOS NOR gate

Circuit diagram:

working principle:

CMOS AND gate

Circuit diagram:

working principle:

CMOS OR gate

Circuit diagram:

working principle:

CMOS NOR gate

Circuit diagram:

working principle:

CMOS XOR gate

Circuit diagram:

working principle:

CMOS transmission gate

Circuit diagram:

working principle:

CMOS tri-state gate

Circuit diagram:

working principle:

Logical symbols:

CMOS open drain gate

Circuit diagram:

Logical symbols:

main feature:

① When working with open drain, an external power supply and resistor must be connected;

②Can realize line and function;

③ Logic level conversion can be realized;

④ Strong load capacity.

2.4 TTL integrated gate circuit