Lecture 2 summary

Lecture 2 summary - Lecture 2 summary ECE 2100 Alyosha...

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Lecture 2 summary ECE 2100 Alyosha Molnar
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I-V curves + conductance • Characterize component by: – Sweeping voltage – Measure current at each voltage: – Plotting an “I-V” curve • Slope (if linear) is conductance (G): – G=dI/dV b I=GV – V=I/G – G is in Siemens (S) + V - I I-V curve, 10kOhm resistor -0.00015 -0.0001 -0.00005 0 0.00005 0.0001 0.00015 -1.5 -1 -0.5 0 0.5 1 1.5 Voltage (V) current (A)
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Resistors: Ohm’s law • Define resistance R=1/G = dV/di – Units Ohms ( ) • Ohm’s law: V=IR I=V/R • Physical resistor have: – R= ρ L/A – L is length of resistor – A is cross-sectional area ρ is resistivity: material property (also accounts for temp effects). • Power in resistor: – P=IV=I·IR=I 2 R – P=IV=V 2 /R + V - I L A
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Diodes: Nastier, but useful Preferentially pass current one way but not the other. Ideally: – I = I o (exp(V D /(V T η ))-1) – V T =kT/q = 26mV – 1< η <2 (fudge factor) Really, in series with resistance, I-V becomes linear
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This note was uploaded on 03/07/2010 for the course ECE 2100 taught by Professor Kelley/seyler during the Spring '05 term at Cornell.

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Lecture 2 summary - Lecture 2 summary ECE 2100 Alyosha...

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