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As shown, two Silicon (Si) abrupt p-n junction diodes are fabricated with uniform donor doping concentrations of N_{D2}=10^{16}cm^{-3} in the n-regions of the diodes, and uniform acceptor doping concentrations of N_{A1}=10^{14} cm{-3} and N_{A2}=10^{16} cm{-3}  in the p-regions of the diodes,respectively.Assuming that the reverse bias voltage is >> built-in potentials of the diodes, the ratio $C_{2}/C_{1} of their reverse bias capacitance for the same applied reverse bias, is _________.


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