l21 - Diodes Diode circuits Transistors Transistor circuits...

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Unformatted text preview: Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law The p − n junction is a diode! From Horowitz and Hill, The Art of Electronics , and Krane’s modern physics text (see also Serway Fig. 12.30): The diode is fully forward biased at about 0.6 Volts. That is, there is a voltage drop of 0.6 volts across a forward-biased diode. Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law Full wave rectifier From Horowitz and Hill, The Art of Electronics : Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law “Triodes”: the transistor What happens at a n − p − n junction? The p − n junction controls conductance between one n junction and the other! Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law The first transistor Bardeen, Brattain, and Shockley, Bell Labs, 1948. Nobel Prize in Physics, 1956. (Bardeen also got the 1972 Nobel Prize in Physics for understanding superconductivity). See also Serway Fig. 12.33. Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law How transistors work From Horowitz and Hill, The Art of Electronics : Emitter, base, collector: V E , V B , V C . Relationships for npn : 1 V E = V B − . 6 Volts 2 I E = β I B , with β ≃ 100 3 V CE can span a large range Mnemonic: npn = not pointing in. An emitter follower, where V out = V in − . 6 Volts. Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law Transistor: history I (1953) Transistor invented 1948 at Bell Labs. Commercial availability: 1953 Cost down to $0.99 by December 1955! Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law Transistor: history II (1953) Diodes Diode circuits Transistors Transistor circuits Modern semiconductor electronics FETs: field effect transistors Integrated circuits Semiconductor lithography Op-amps Digital logic Microprocessors Moore’s law A regulated D.C. power supply From Horowitz and Hill, The Art of Electronics : Zener diodes begin to conduct at a well- defined reverse bias voltage. Diodes...
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This note was uploaded on 05/28/2011 for the course PHY 251 taught by Professor Rijssenbeek during the Fall '01 term at SUNY Stony Brook.

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l21 - Diodes Diode circuits Transistors Transistor circuits...

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