Lab 3 - 2B 2010

Lab 3 - 2B 2010 - ECE 2B Lab#3 Lab 3 Transistors at DC...

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1 © Bob York ECE 2B Lab #3 Lab 3 Transistors at DC Overview In this lab you will experiment with the three types of transistors: JFETs, BJTs, and MOSFETs. Later coursework (ECE132) will teach you about the physics of how these devices work. Our goal in ECE2 is more practical and focused on using the devices: understanding their current-voltage characteristics, and learning how to configure the circuit environment for the transistor to set the appropriate biasing conditions. In this lab we will not build any clever functional circuits; the goal is simply to learn how to bias transistors correctly. This is always the first step in transistor circuit design, and is crucial to determining the success or failure of the circuit. In fact, most of the mistakes made by beginning students with transistor circuits can usually be traced to incorrect DC biasing. Table of Contents Pre-lab Preparation 2 Before Coming to the Lab 2 Parts List 2 Background information 3 Transistor Basics 3 Junction Field-Effect Transistors 3 Metal-Oxide-Semiconductor (MOS) Devices 5 Bipolar Junction Transistors 7 In-Lab Procedure 9 3.1 Depletion-mode FETs (JFET) 9 Measuring I-V characteristics 9 JFET Biasing Circuit 10 3.2 Enhancement-mode MOSFETs 11 Gate-Drain I D -V gs Characteristics 11 Four-Resistor Bias Circuit 12 Simple LED Blinker 13 More on Switching 13 3.3 CMOS Circuits 14 3.4 Bipolar Junction Transistors (BJTs) 16
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