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← ScienceWhich mechanism drastically alters a gallium arsenide varactor diode capacitance?
A)Reverse bias depletion region expansion✓
B)Crystal lattice point defect tunneling
C)Increased electron-hole recombination rate
D)Temperature-induced Fermi level shift
💡 Explanation
Increasing reverse bias widens the depletion region using **space charge modulation**, functioning as a variable capacitor because greater reverse bias leads to a thinner insulating layer, therefore increasing capacitance rather than electronic failures or fundamental physics related effects.
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