1. An apparatus comprising: a graphene nanoribbon having a chain of electronic components formed therein, wherein the chain of electronic components includes: first and second transistors formed in the graphene nanoribbon, wherein the first and second transistors are configured to act as input transistors of a differential amplifier; and a third transistor formed in the graphene nanoribbon and configured to operate as a current source, wherein the current source is configured to draw current through the first and second transistors, and wherein the third transistor is physically adjacent to the first transistor.