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Introduction to Transistors

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Presentation on theme: "Introduction to Transistors"— Presentation transcript:

1 Introduction to Transistors
Instrument Systems Spring 2007 Jose Rey April 2007

2 Transistors Everywhere
Similar diodes end-to-end (n-p-n and p-n-p junctions Sandwiched junction is very thin Small current on the “base” can control a large current flowing from “collector” to “emitter” Can be used as an amplifier to make a weak signal stronger Can replace mechanical switches

3 Transistors First Transistor Bell Labs
First transistor was point contact Ge bipolar junction transistor

4 Bipolar Junction Transistors (BJT)
n-type Contributor (excess) C = Collector (Drain) B = Base (Gate) E = Emitter (Source) Shown on right: BJT (Bipolar Junction Transistor) p-type “holes” (shortage) n-type Contributor (excess)

5 Switch Application From:

6 Field effect transistor (FET)
Only two layers Electric Field Controls Current Flow Voltage applied between the Gate and Source terminals modulates the current between the Source and Drain terminals Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or junction field effect transistor(JFET) Large amount of Chemical Sensors are based on MOSFETs C = Collector (Drain) B = Base or Gate E = Emitter (Source)

7 Diodes Quick Review Diodes AND LED’s Current flows from Anode+ to Cathode- Place a LED in the following circuit, how?

8 Transistors Quick Review
In NPN Transistor Collector AND Emitter are n doped, Base is p doped When Transistor is saturated, current flows at maximum AND no longer controlled by Base

9 End of presentation

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