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Physics of Semiconductor Devices |
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Varactor - Exam January 27, 2012A varactor is a pn junction that is used as a variable capacitor. (a) How can a pn junction be used as a variable capacitor? How do you change the capacitance? (b) What determines the depletion width at zero bias voltage? (c) Draw the electric field in a varactor at zero bias voltage. (d) How could you measure the doping concentration from the capacitance-voltage characteristics? |