English: A NOR gate implemented in CMOS. The two n-type transistors on the bottom in parallel set the output Y to low (zero) when either A or B is high; the two p-type transistors in series at the top pull the output to high (one) if both inputs are zero. Because p-type transistors are slower than n-type transistors, a NOR gate is less efficient than a NAND gate in CMOS.
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