Signal transmission device, signal reception device, test module, and semiconductor chip

摘要

There is provided a signal transmission device which transmits, in the form of an optical signal, multivalued data which shifts through three or more plurality of logical values, and includes: a light emitting element which outputs light having an intensity corresponding to a power supply current supplied thereto; a current source which is capable of supplying the light emitting element with the power supply current which has a plurality of current values corresponding to the plurality of values through which the multivalued data shifts; and a modulating section which modulates the current value of the power supply current supplied from the current source, in response to a shift of the multivalued data.