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EE 330 Lect 14 Fall 2011

EE 330 Lect 14 Fall 2011 - EE 330 Lecture 14 Devices in...

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EE 330 Lecture 14 Devices in Semiconductor Processes MOS Transistors
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Lets study the diode equation a little further For two decades of current change, Vd is close to 0.6V Diode Characteristics 1E-12 1E-10 1E-08 1E-06 0.0001 0.01 1 100 10000 0 0.2 0.4 0.6 0.8 1 Vd (volts) Id (amps) This is the most useful current range for many applications 1 e I I t d V V S d Review from Last Time
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Lets study the diode equation a little further Diode Characteristics 0 0.002 0.004 0.006 0.008 0.01 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Vd (volts) Id (amps) Widely Used Piecewise Linear Model 1 e I I t d V V S d 0 I 0.6V V 0.6V V 0 I d d d d Review from Last Time
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0 0 D D D D I 0 if V V if I 0 Diode Models Diode Equation 1 e I I t d V V S D Piecewise Linear Models 0 I 0.6V V 0.6V V 0 I d d d d 0 I R I 0.6V V 0.6V V 0 I d d d d d d When are the piecewise-linear models adequate? When it doesn’t make much difference whether Vd=0.6V or Vd=0.7V is used When is the ideal PWL model adequate? When it doesn’t make much difference whether Vd=0V or Vd=0.7V is used Review from Last Time
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Use of Piecewise Linear Models for Nonlinear Devices when Analyzing Electronic Circuits Process: 1. Guess state of the device 2. Analyze linear circuit 3. Verify State 4. Repeat steps 1 to 3 if verification fails Observations: o Analysis generally simplified dramatically o Approach applicable to wide variety of nonlinear devices o Closed-form solutions give insight into performance of circuit o Usually much faster than solving the nonlinear circuit directly o Wrong guesses in the state of the device do not compromise solution (verification will fail) o Helps to Guess Right the first time Review from Last Time
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Types of Diodes pn junction diodes Metal-semiconductor junction diodes Signal or Rectifier Pin or Photo Light Emitting LED Laser Diode Zener Varactor or Varicap Schottky Barrier Review from Last Time
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Capacitors • Types – Parallel Plate – Fringe – Junction Review from Last Time
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Parallel Plate Capacitors C d A 1 A 2 cond 1 cond 2 insulator A = area of intersection of A 1 & A 2 d A C One (top) plate intentionally sized smaller to determine C Review from Last Time
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Fringe Capacitors C Review from Last Time
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Fringe Capacitors d C d A ε C A is the area where the two plates are parallel Only a single layer is needed to make fringe capacitors Review from Last Time
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