What characteristic of a PIN diode makes it useful as an RF switch?
Extremely high reverse breakdown voltage
Ability to dissipate large amounts of power
Reverse bias controls its forward voltage drop
Low junction capacitance✓Respuesta correcta
Explicación
The thick intrinsic layer between the P and N regions keeps a PIN diode's junction capacitance very low, so when it is reverse biased it looks close to an open circuit even at VHF and above and the switch gives good isolation. High reverse breakdown and power handling matter elsewhere, and reverse bias does not set the device's forward voltage drop.