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Diodes Part II (1) - Circuit Analysis with Diodes...

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Circuit Analysis with Diodes Non-linear device, need to analyze using approximate analysis method or device model I D = I S ( D T v nV e -1) V D = V S - I D R Approximate methods Graphical: plot I-V characteristic of diode, draw KVL line (load line), find intersection Very approximate See Example 3-5 Numerical: Can be extremely accurate with enough iterations, tedious by hand MATLAB example Diode models Ideal - simplest Diode = short for v D > 0, diode = open for v D < 0 Useful for ON/OFF logic in circuits with voltages >> V ON
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Constant voltage drop (CVD) Diode = short for v D > V ON , diode = open for v D < V ON Much better than ideal model if voltages not >> V ON Very useful when don’t need great accuracy CVD + R S Diode = small resistance R S for v D > V ON , diode = open for v D < V ON Useful when circuit resistances are small ( R S ), otherwise adding R S has minor effect We generally use rough models for hand calculations, then do computer simulations when we want more accuracy Example Diode Circuit Examples Logic Gates Only concerned with ON/OFF, V ON not important Example:
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Limiting circuits – examples Voltage regulators
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