PIN Diodes and the Theory of Microwave Operaton

Part of the Electrical/Computer Science and Engineering Series book series (NRECSES)


The PIN diode should not be thought of as something physically different from the PN junction discussed in Chapter I, but rather different in a sense of degree. In Chapter I we saw that with the abrupt junction the width of the depletion zone is inversely proportional to the resistivity of the P or N region, whichever has the lesser impurity doping concentration. As the width of the depletion zone increases, the capacitance per unit area of the junction decreases. This effect is very beneficial for a diode which is intended for use as a microwave switch because the lower the capacitance the higher the impedance of the diode under reverse bias, and the more effective the device is as an “open circuit.”


Equivalent Circuit Reverse Bias Insertion Loss Bias Current Forward Bias 
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Copyright information

© Van Nostrand Reinhold Company 1982

Authors and Affiliations

  1. 1.Microwave Associates, Inc.BurlingtonUSA

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