Discussion
Electrical model of PIN diode in microwave region can be given as below for forward bias :
Answer: A
The forward-biased model is an inductor in series with a resistor.
Under forward bias the intrinsic region of a PIN diode is flooded with injected carriers, so it behaves as a small resistance Rf that falls as the bias current rises. In series with it is the package and lead inductance L. That simple series L-R circuit is the forward-bias microwave model, which is why PIN diodes are used as current-controlled resistors in switches and attenuators.
The third option, lead inductance in series with a parallel resistance and capacitance, is the reverse-bias model, in which the depleted I-region acts as a capacitor with a large parallel resistance. The fourth, a capacitor in series with a resistor, is a simplified reverse-bias model, and the second, a resistor across the inductor, is not the standard model for either bias.
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