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Download Lab #1: Ohm’s Law (and not Ohm’s Law)
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Transcript
Lab #8: Transistor • basics of the transistor • a few simple circuits Bardeen’s “transfer resistance” device Spreadsheet Upload Only Transistor Two back-to-back diodes, one forward and one “reverse” biased. Three terminal device: emitter, collector, base Small “base” current controls “large” emitter-collector current. Voltage drop across forward-biased diode about 0.7 V Read lab carefully; it is short. Transistors Transistor, two caps, a resistor E B C Transistor Circuit #1 C B C B E Basic cct Will use to study the Ebers-Moll model of the transistor I C = I S (eVBE /VT - 1) I B = I C / hFE VT , I S .h FE are properties of the transistor, with VT » 25mV I S is the saturation current h FE » 20 - 1000 We will plot ln(IC ) vs VBE for 2 different types of transistors E Transistor Circuit #2 wiggle in base voltage DV. VBE is roughly constant, so causes a wiggle in the voltage at the emitter of DV DV R2 This means the voltage at the collector wiggles by R1 DV R2 This means the current must wiggle by amplifier
