Lab 6 - 2B 2010

Lab 6 - 2B 2010 - ECE 2B Lab#6 Lab 6 Introduction to...

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1 © Bob York ECE 2B Lab #6 Lab 6 Introduction to Digital Electronics Overview This lab continues our exploration of transistor switching circuits to include CMOS logic gates, latches, and flip-flops. We will explore simple shift-register and counter circuits using small arrays of flip-flops. We will also demonstrate a simple scheme for digital-to-analog and analog-digital conversion. Table of Contents Background information 2 Digital Logic Functions 2 Pre-lab Preparation 3 Before Coming to the Lab 3 Parts List 3 In-Lab Procedure 4 6.1 Logic Gates 4 Logic Levels and Indicators 4 CMOS Logic 4 SR Latch 5 D-flip-flop 5 6.2 Shift Registers and Counters 7 Switch Debouncing 7 Shift Register 7 Optional (Extra Credit): Ring Counter and Johnson Counter 8 Ripple Counter 8 Synchronous Counter 9 6.3 Digital-Analog Conversion 9 6.4 Extra-Credit: A Tracking Analog-Digital Converter 10
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2 Introduction to Digital Electronics © Bob York 2 Background information Digital Logic Functions Digital electronics is largely based on two-state or binary logic. The two logic states are designated “0” (low) and “1” (high) and defined electronically by fixed voltage levels. The low-state is usually the reference or ground potential in the circuit, and the high-state is some positive voltage such as +5 V. A logic “gate” takes one or more logic-level inputs and produces a single logic-level output. The output is also a logic level, so the output of one logic gate can connect to the input of one or more other logic gates. Table 6-1 summarizes the basic logic functions for 1- and 2-input gates. Table 6-1 – Summary of gate symbols and functions Gate Symbol Truth table AND A B OUT 0 0 0 0 1 0 1 0 0 1 1 1 OR A B OUT 0 0 0 0 1 1 1 0 1 1 1 1 NOT A OUT 0 1 1 0 Gate Symbol Truth table NAND A B OUT 0 0 1 0 1 1 1 0 1 1 1 0 NOR A B OUT 0 0 1 0 1 0 1 0 0 1 1 0 XOR A B OUT 0 0 0 0 1 1 1 0 1 1 1 0 The cheapest 2-input gates to manufacture are the NAND and NOR gates. It can be shown that NAND gates alone (or NOR gates alone) can be used to reproduce all the other logic gates.
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Pre-lab Preparation 3 © Bob York 3 Pre-lab Preparation Before Coming to the Lab Read through the lab experiment to familiarize yourself with the components and assembly sequence. Before coming to the lab, each group should obtain a parts kit from the ECE Shop. Parts List The ECE2 lab is stocked with resistors so do not be alarmed if you kits does not include the resistors listed below. Some of these parts may also have been provided in an earlier kit. Qty Description 1 CD4007 CMOS pair/inverter 2 CD4011 Quad 2-input NAND gate 2 CD4013 Dual D flip-flop 2 CD4093 Quad 2-input NAND Schmitt 1 74191 4-bit up/down counter 1 LM392N op-amp/comparator combo 4 Tactile pushbutton switch, SPST PCBPB1 4R e d L E D 2 0 m A 4 Ceramic capacitor 0.01uF (10nF) 4 470-Ohm 1/4 Watt resistor 4 1-KOhm 1/4 Watt resistor 3 10-KOhm 1/4 Watt resistor 1% metal film 5 20-KOhm 1/4 Watt resistor 1% metal film
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4 Introduction to Digital Electronics © Bob York 4 In-Lab Procedure 6.1 Logic Gates
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This note was uploaded on 03/17/2010 for the course ECE 2B taught by Professor York during the Winter '07 term at UCSB.

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Lab 6 - 2B 2010 - ECE 2B Lab#6 Lab 6 Introduction to...

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