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# Note for Analog And Digital Electronics - ADE by Siddharth Rajput

• Analog And Digital Electronics - ADE
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UNIT I: DIGITAL ELECTRONICS LAST SIX YEARS' GATE ANALYSIS 6 Number of questions 5 4 Marks 1 Marks 2 Total number of questions 3 2 1 0 2015 2014 2013 2012 2011 2010 Concepts on which questions were asked in the previous six years Chapter 1.indd 1 Year Concepts 2015 K-maps, Half and full adder, JK flip-flop, Boolean operators, Prime implicates, Base values, Johnsen counter, Binary operator, D flip-flop 2014 Minterm expressions, Combinational functional blocks, Boolean expressions, flip-flops 2013 2’s complement, Truth tables, Logic gates, RAM chips 2012 K-maps, Truth tables, IEEE single precision 2011 Flip-flops, Boolean expressions, Logic gates 2010 K-maps, 2’s complement, Multiplexer, Boolean expression, Sequential circuits 4/9/2015 9:40:08 AM

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Chapter 1.indd 2 4/9/2015 9:40:08 AM

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CHAPTER 1 DIGITAL ELECTRONICS Syllabus: Digital electronics: logic functions, minimization, design and synthesis of combinational and sequential ­circuits, number representation and computer arithmetic (fixed and floating point). Number system 1.1  INTRODUCTION Digital electronics represents discrete signals instead of signals in a continuous range. It uses two binary levels 0’s (corresponding to false) and 1’s (corresponding to true). The main reason for advancement in digital electronics is integrated circuits (ICs). Radix/Base representation Numeric codes Codes representation Alphanumeric codes EBCDIC Weighted Non-weighted ASCII 1.2  NUMBER SYSTEM Number system is an age old method to represent numerals (Fig. 1.1). Decimal number system is the most common number system and binary number system is used by computers. Chapter 1.indd 3 Binary Gray code BCD XS3 code 2421 code Figure 1.1 |   Number system. 4/9/2015 9:40:08 AM