Transcription: The topic for this lesson is varactor and other special diodes. The varactor diode operates in the reverse bias mode and is doped to maximize the capacitance inherent in the depletion region. When a PN junction is reverse biased, the depletion region at the junction has a width that is dependent upon the junction voltage. The depletion region is formed by accumulation of space charge. Because of this space charge and the voltage across the depletion region, the depletion region possesses a voltage similar to capacitance. The junction capacitance is inversely proportional to the width of the de ...
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