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lect6 - AERO ASTRO 16.682 Prototyping Avionics Spring 2006...

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ASTRO AERO 16.682 - Prototyping Avionics Spring 2006 LECTURE 6 LECTURE 6 February 27, 2006 February 27, 2006 DEPARTMENT OF AERONAUTICS AND ASTRONAUTICS Alvar Saenz-Otero Alvar Saenz-Otero
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Outline Transistors Introduction NPN/PNP MOSFETs Digital Logic Introduction Massachusetts Institute of Technology 2 16. 6 82 - Prototyping Avionics
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We want an electronic switch which allows us to open or close a circuit… The diode could do that if we reversed voltage: V+ V+ V+ “short” D “open” V- “on” V- “off” + V- v > v v + < v But can we do it by commanding a separate voltage, instead of the input voltage? That is w hat a transistor is for: C C C B i CE “on” B “short” B “open” v B i i BE i CE BE “off” E E E v E v B > v E i CE >> i BE v B < v E i CE = i BE = 0 Massachusetts Institute of Technology 3 16. 6 82 - Prototyping Avionics Transistor Introduction
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t is amplified E Current “amplification” components B P i C = α i B α PNP: N ~ 40-200 P Have three connections: C Base - he “control” of the transistor Emitter - the connection that emits curr ent
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