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Unformatted text preview: for these circuits as the variable capacitor. Consider a pn junction with p-side doping N a =10 14 cm-3 and n-side doping N d = 10 16 cm-3 . Use the approximation that the junction is one-sided. a) What is the thermal equilibrium depletion region width? b) What is the reverse bias needed to increase the depletion width to 3 m? c) If the maximum electric field allowable in the junction is E max = 710 4 V/cm, what is the maximum depletion width? What is the bias voltage corresponding to the maximum depletion width? d) Given an inductance of 5 nH, calculate the area of the diode to make the resonant frequency 1 2 LC = 1 GHz, when the voltage across the diode is 0 V. e) Plot the range of frequencies that can be tuned with the range of tuning voltages from 0 V to the maximum voltage calculated in (c)....
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This note was uploaded on 09/24/2010 for the course EE 6.012 taught by Professor Charlessodini during the Spring '08 term at MIT.
- Spring '08