Delete comment from: Ken Shirriff's blog
I understand why gates like NAND/NOR need in and in' signals since they use them to open separate transistors connect to high and ground (each gate in a CMOS pair being ideal for either charging or draining the voltage at speed). But I can't see why this is needed for a transmission gate which looks like its intent is solely to connect or disconnect two points in a circuit. Surely just a single transistor would suffice in that case, no? Any drainage of out when the transistor is closed would be handled by a path to ground through a resistor. Why are two transistors used here?
Sep 25, 2024, 10:04:54 PM
Posted to Reverse engineering CMOS, illustrated with a vintage Soviet counter chip