Simple Analysis of Transistor Amplifier

Simple Analysis of Transistor Amplifier - 1/10 Simple...

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Unformatted text preview: 1/10 Simple Introduction to Transistor (BJT) Amplifier 2/10 • Made out of n-type and p-type silicon • There are two “flavors” of BJT’s – pnp & npn Bipolar Junction Transistor npn Transistor Note: Current Directions Shown are Arbitrary!! To Learn More!! EECE 332 (Semiconductors) “ Why do they work?” pnp Transistor Fig. 28.6 from Electrical Engineering Uncovered 3/10 • Recall FET: current flow controlled by the gate voltage • BJT: current flow controlled by the base current – Acts like a current amplifier • But… with the right circuitry around it can also be a voltage amplifier BJT Operation To Learn More!! EECE 315 (Electronics) “ How do they work?” Fig. 28.4 from Electrical Engineering Uncovered Conceptual Model of npn Transistor Collector Emitter Base Current Meter Variable R • Base Current deflects current meter • Meter linked to variable R – Controls the Collector current Î Voltage supply between C & E provides large Collector current controlled by small Base current 4/10 • While this electrical conceptual model is good… we can also use a water model BJT Water Model Fig. 28.5 from Electrical Engineering Uncovered...
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This note was uploaded on 02/29/2012 for the course EECE 301 taught by Professor Fowler during the Fall '08 term at Binghamton.

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Simple Analysis of Transistor Amplifier - 1/10 Simple...

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