Chapter 1 Introduction: Digital Systems & Logic Design By Taweesak Reungpeerakul.

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Presentation transcript:

Chapter 1 Introduction: Digital Systems & Logic Design By Taweesak Reungpeerakul

CH12 Digital Systems Digital and Analog Quantities Parameters of Pulse Waveform Basic Logic Combinational Logic Digital Integrated Circuits An example of Digital System Design Flow

CH Digital & Analog Quantities Analog Quantity?  Continuous Values Digital Quantity?  Discrete Set of Values Which one has more advantages?  Digital Quantity (process & transmit) Efficiency Reliability

CH14 Analog & Digital Example

CH15 Analog & Mixed System Analog System Digital and Analog System

CH Binary Digits, Logic Levels, and Digital Waveforms Binary Digits: 0  Low, 1  High Code: Group of Bits Logic Level: represented by voltages

CH17 Digital Waveforms Pulse Positive-going pulseNegative-going pulse Waveform Characteristic Question t W : pulse width t r : rise time t f : fall time T : period f : frequency f = 1/T T = 1/f Duty Cycle = ( t w / T ) 100%

CH18 Clock and Bits Waveforms Clock is a periodic waveform (signal) in which each interval between pulse equals the time for one bit

CH19 Timing Diagrams How 2 or more waveforms change and relate

CH Basic Logic Operations NOTANDOR Symbol Truth Table In Out In 1 In 2 Out In 1 In 2 Out

CH Basic Logic Functions

CH112 Basic Logic Functions (cont) Mux Demux n 2n2n

CH113 Basic Logic Functions (cont) Flip-flops Counters Registers

CH Digital Integrated Circuits IC Packages: DIP, SMT, SOIC, PLCC, LCCC, FP IC Complexity Classifications  SSI: gate ≥ 12, basic gates & flip-flops  MSI: 12 ≤ gate ≥ 99, logic functions  LSI: 100 ≤ gate ≥ 9999, including memory  VLSI: 10,000 ≤ gate ≥ 99,999  ULSI: gate ≥ 100,000

CH115 Integrated Circuit Technologies Types of Transistors  Bipolar Junction Transistors  MOSFETs (metal-oxide semiconductor field-effect transistors) Bipolar used in: transistor-transistor logic (TTL) and emitter-couple logic (ECL) MOSFETs used in: complementary MOS (CMOS) and n-channel MOS (NMOS)

CH Testing and Troubleshooting Instruments Oscilloscope  Analog  Digital Logic Analyzer DC Power Supply Function Generator Digital Multimeter

CH Digital System Application

CH118 Design Flow