This is a CMOS transmission gate, which acts as a switch. When the switch input is high, the 40 Hz signal can pass through the transmission gate. When the switch input is low, it cannot; the transmission gate acts as an open circuit. Normally a discrete MOSFET has its body terminal connected to the source terminal, but that does not work in this case. The source terminal of the n-MOSFET may have a higher voltage than the drain (and the drain of the p-MOSFET may be higher than the source), which could cause the body diode to conduct. Therefore, instead the MOSFETs must have a separate body terminal connected either to ground (for the n-MOSFET) or to the supply voltage (for the p-MOSFET).
This page is a utility for simulating шлюз передачи cmos online with specified initial values.










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