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In Digital Design and Computer Architecture (Harris and Harris), the following schematic is given figure 1.23, in discussing logic levels.

Why are the driver and receiver depicted as inverters?

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  • \$\begingroup\$ The simplest use of a single transistor that improves the noise margin ---- is the inverter. \$\endgroup\$ – analogsystemsrf Jul 31 at 14:49
  • \$\begingroup\$ Probably because they invert the logic of thr signal. A simple common-emitter bjt config is an inverter. \$\endgroup\$ – Kripacharya Aug 2 at 18:01
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Just for convenience. This is the simplest case, and the easiest to understand at the transistor level.

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  • \$\begingroup\$ I don't understand why black boxes aren't used? Isn't the logic circuit of both the driver and receiver arbitrary? \$\endgroup\$ – Mussé Redi Jul 31 at 12:40
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    \$\begingroup\$ Yes, but a black box doesn't imply that we're talking about primitive logic gates so it could be more confusing. In any event, the narrative text that surrounds the image should provide the proper context. \$\endgroup\$ – Elliot Alderson Jul 31 at 12:45

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