1. A multiple transistor differential amplifier implemented on a single graphene nanoribbon sensor, the differential amplifier comprising: a first plurality of electrical conductors, each conductor configured to form an electrical contact at a separate portion of a single graphene nanoribbon; a second plurality of electrical conductors, each conductor separated from the graphene nanoribbon by an electrically insulating material so that each of the second plurality of electrical conductors exerts an electric field on the graphene nanoribbon sufficient to form a gate of a field effect transistor; a current source formed in a first section of the graphene nanoribbon of at least one of the electrical contacts and at least one of the gates; a differential amplifier formed in a second section of the graphene nanoribbon of at least one of the electrical contacts and at least one of the gates, and connected with the current source; at least a first portion of the differential amplifier comprising a first graphene nanoribbon transistor electrically responsive to an incoming electrical signal presented to the first graphene nanoribbon transistor; and at least a second portion of the differential amplifier comprising a first graphene nanoribbon transistor electrically responsive to the incoming electrical signal; wherein the differential amplifier and current source together operate as a differential amplifier configured to generate an outgoing signal responsive to the incoming electrical signal.