# Digital Electronics

Aug 6th, 2016
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Harvard University
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Contains sufficient information about Number systems(binary, octal, decimal and hexadecimal) and codes(binary codes, excess-3 codes, BCD codes), conversion from decimal to binary number system and vice-versa, binary arithmetic(addition, subtraction, multiplication and division of binary numbers).

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SPH 2433 Lecture 4 Sep-Dec 2015SPH 2433 Digital Electronics4. Digital electronics4.1. IntroductionA signal is a physical quantity that carries information and changes with respect to time. E.g. voice,television picture, etc.All signals can be converted into electrical signals. For instance, Voice Microphone Electrical Signal Speaker Voice. Such electrical carry information with electrical parameters such as voltage andcurrent.Electronic signals are transmitted in either of two basic forms; analogue or digital.An analogue signal varies continuously in time in that it can take any value between certain limits. It variessome physical property, such as voltage, in proportion to the information being transmitted. For instance,the voltage pattern emerging from a microphone varies in proportion to the sound variations falling uponit.A digital signal does not vary continuously in time. It is discrete in time in that only two possible statesare allowed.An analogue signal can be converted into a digital signal in a process called digitization. Figure 4-1illustrates the continuous-time analogue signal and the discrete-time digital signal.Figure 4-1: Analogue and digital signals.A device in which only two possible states are allowed is a two-state device. For instance, a two-statedevice may be such that at any one time it is either ON or OFF.Two-state devices are constructed using the so-called logic circuit

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