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Unformatted text preview: 10/21/2011 1 ME-340 Circuits & Mechatronics Lecture # 24 2010.10.21 Thoughts on organizing time: 50 hours/week work Devote 10 hours per class including lectures Motivator: ME curriculum, prevalence of mechatronics in modern life, details allow you to know the technologies (ideally you would build it) 2 Recap from last lecture 3 BJT - Bipolar Junction Transistor BJT: join 3 semiconductor sections, each with different doping (element or concentration) 2 types: pnp: arrow into npn: arrow out p + , n + : heavily doped p- , n- : lightly doped p, n: normal doping 10/21/2011 2 Symbols and npn BJT Operation Emitter-Collector Behavior KCL : i E i C i B KVL : BC BE CE npn: arrow out BE junction w/open-collector When collector open, BE junction = diode BJT Eqns of Operation Small base current controls LARGER collector current Shockley Eqn for Base-Emitter: Apply to others: i E I ES exp BE V T 1...
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This note was uploaded on 02/07/2012 for the course M E 340 taught by Professor Staff during the Spring '08 term at University of Texas at Austin.
- Spring '08