What is a CMOS switch?
The CMOS switch core consists of an NMOS and a PMOS transistor in parallel as mirror images to each other. When the CMOS switch is “on, the V_gate of the NMOS transistor is equal to Vcc while the V_gate of the PMOS transistor is 0V. When the input voltage rises and reaches the threshold of the PMOS transistor, the PMOS is turned off while the NMOS becomes more conductive, and vice-versa for the falling edges of the input. Thus, the CMOS switch will pass through the full range of the input voltage without clamping. Pericom PI2BXX, PI3BXX, PI5AXX, PI5LXX, and PSXX switch families are CMOS technology switches.
