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Unformatted text preview: D , i D ? We could get V 1 and the slope from VI curve or we can use diode VI equation We know i D =I D =1mA, find v D from VI eq. EXAMPLE (continued) Piecewise Linear Model of the Zener Diode same approach with V f and r D for the forward bias condition Application of Piecewise Linear Models why not just the graphical solution method? Piecewise linear approximation is a powerful approach when you have ac sources in the circuit EXAMPLE Circuit with a squarelaw device (A=1mA/V 2 , V TR =0V) Problem: we do not have a single solution point, since v TH const v TH_MIN = v TH_MAX = v TH_MED = EXAMPLE (continued) a) We could use the device VI equation to solve for v S and i S : From circuit From device VI equation: Combine both: b) Use piecewise linear model From the approximation circuit: for v TH =3.8V (point A): for v TH =2.2V (point B):...
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 Fall '08
 NIKULIN

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