Digital Circuits
1. The Digital Comparator
IN LAST MONTH’S column, we discussed the analog comparator and illustrated some applications for it. This month, we’re going to look at its digital counterpart, the magnitude comparator. Figure 1 is the logic diagram for a simple magnitude comparator. The circuit, which can be made using a single 7400 quad NAND gate, compares two logic signals applied to its inputs. When both input signals are at the same logic level, a logic 0 appears at the output. When the inputs are at different logic levels, the output is a logic 1.
Fig. 1 Logic diagram for an Exclusive-OR gate synthesized from NAND gates. ...
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