Pull-down network
Beginner
The group of switches in a gate that can connect the output to ground, making it a 0.
Novice
The NMOS transistors between the output and ground (GND) of a CMOS gate. When they form a conducting path, the output is pulled down to 0.
Expert
The NMOS network of a static CMOS gate. It conducts exactly when the gate’s output should be 0, so its Boolean function is the complement of the gate’s function. Series depth sets NMOS sizing and fall delay.