The I-V curve and the C-V curve of the PIN diode.
The SPST switch circuit chip is depicted in Figure 2 (a), which is
designed using the principle of a parallel switch between PIN diodes and
microstrip transmission lines. To improve isolation, three GaAs PIN
diodes are chosen to be impedance matched in cascade to achieve the best
performance index. The bypass with PIN diode and sector low-pass filter
are matched on the high-impedance line of the SPST switch to reduce the
insertion loss of the device. The PIN diode can loop in the circuit by
bonding to the ground at the opposite end of the high-impedance line.
The on state of the switch corresponds to the reverse state of the PIN
diode, and the off state of the switch corresponds to the forward state
of the PIN diode.