Enhancement Mode MOSFETs As Switches - The NOR Gate
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Enhancement Mode MOSFETs As Switches - The NOR Gate Enhancement-mode MOSFETS are primary components in amplification and switching circuits. They are combined in various ways as gates to realize complex switching configurations.

Figure 123.5(a) is an arrangement of two pMOS connected in series and two nMOS connected in parallel to form a NOR gate. Figure 123.5(b) is the symbol and Figure 123.5(c) is the truth table for the configuration.
Show how the circuit of figure 123.5(a) functions as a NOR gate.

The strings: S7P5A51 (Physical Change).

The math:
Pj Problem of Interest is of type change (physical change). Transistors are primarily used for signal amplification and switching. Both are change problems. Consider figure 123.5(a). When A = 0 and B = 0, there is a conduction path from each pMOS to the output. So the output=1. The output is 0 for all other input values of A and B as shown in the truth table (figure 123.5c).

NOR-gates can also be used to build any kind of gate. For example, an INVERTER is a NOR-gate with only one input; an OR-gate is a NOR-gate with an INVERTER at its output, and an AND-gate is a NOR-gate with an INVERTER at each input.

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