Let us now focus on some key parameters of PIN Diodes that is useful to know. First is the Insertion Loss. When the diode is used in shunt configuration, the Insertion loss is determined by CD (the diode capacitance). When the diode is used in series configuration, the Insertion loss is determined by rD (the diode resistance). The second parameter is the Isolation. When the diode is used in shunt configuration, the Isolation is determined by rD (the diode resistance). When the diode is used in series configuration, the Isolation is determined by CD (the diode resistance). Finally we have the Distortion. The distortion is solely determined by If, Tau (t ) and rD.