Course Title : Digital Circuits

Code 60600
Course Year 3rd year
Term 1st term
Class day & Period
Credits 2
Restriction No Restriction
Lecture Form(s) Lecture

Course Description

This lecture covers basics of digital circuits. First, fundamental properties of digital signals such as frequency characteristics, transmission and shaping of digital signals will be explained. Next, switching operation of semiconductor devices such as diodes, bipolar transistors and MOS transistors will be examined. Finally, circuit structure and performance of logic gates and memories for digital integrated circuits will be discussed.


The level of achievement toward the goal of this lecture will be examined by a regular exam.

Course Goals

To understand basic properties of digital signals and linearized circuits. To understand operating principles, circuit performance, and design method of logic gates and memories.

Course Topics

Theme Class number of times Description
Basic properties of digital signals 2 Frequency spectrum of digital signals and step response of linearized circuit will be explained.
Transmission of digital signals 2 Signal transfer characteristics of loss-less transmission lines will be explained. Lossy transmission lines will also be covered.
Switching characteristics of semiconductor devices 3 DC and transient characteristics of pn junction diodes, bipolar transistors, MOS transistors will be explained.
Waveform shaping of digital signals 1 Waveform shaping circuits such as a clipper, limiter, and Schmitt-trigger circuits will be explained.
Bipolar digital circuits 2 Basic logic gates using bipolar transistors are explained. First, DC and transient characteristics of an bipolar inverter circuit will be analyzed. Next, circuit configuration, operating principle and circuit performance of an ECL gate will be discussed.
MOS digital circuits 3 Basic logic gates using MOS transistors are explained. Circuit configuration, operating principle and circuit performance of a complementary logic gate, a complex logic gate, and a dynamic logic gate will be discussed.
MOS memory circuits 1 Circuit configuration of ROM and RAM will be explained.
Confirmation of understanding 1 The level of understanding on this lecture will be confirmed.


Hand-outs will be provided.



Semiconductor Engineering, Logic Circuits, Electronic Circuits

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