THE SMALL SIGNAL AC IMPEDANCE OF A SHORT p±n JUNCTION DIODE
نویسنده
چکیده
when a direct voltage is applied under low injection conditions. In Equation (1) o is the angular frequency o= 2pf, where f is the frequency, R0=(dI/ dV)ÿ1, tp is the lifetime of the hole minority carriers, w is the length of the lower doped n bulk region, Lp is the minority carrier diusion length for holes, with tp=Lp /Dp, where Dp is the diusion coecient, and ®nally tw=w /Dp is a characteristic transit time. When the lower doped n region of the diode is narrow (w<<Lp) the impedance in Equation (1) can be approximated in the whole frequency range by the function
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