B4 - Section B4 Diode Equivalent Circuit Models If we keep...

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Section B4: Diode Equivalent Circuit Models If we keep the diode operation away from the breakdown region, the curve of Figure 3.18 may be approximated as piecewise linear and we can model the diode as a simple circuit element or combination of standard circuit elements (We do love to model things and analyze circuits, don’t we?). However, just like in circuits composed of resistors, inductors and capacitors, we must look at dc and ac separately. DC Diode Model To define the dc diode model, we look at the characteristics of an ideal diode and the modifications that were required due to practical considerations. To review: ¾ Ideal diode : V ON = 0, R r = and R f = 0. In other words, the ideal diode is a short in the forward bias region and an open in the reverse bias region. ¾ Practical diode (silicon): V ON = 0.7V, R r < (typically several M ), R f r d (typically < 50 ). The general representation for a practical diode under dc operating conditions is shown below. Recall the diode is a two-terminal device, which
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