Patent ID: 8253526

Claim:
An apparatus including a substrate with interface electrodes and integrated calibration and differential signal receiver circuitry mutually coupled via a plurality of conductors, comprising: a substrate; first and second calibration electrodes disposed on said substrate to convey a calibration current and a related calibration voltage; first and second calibration conductors disposed on said substrate and coupled to said first and second interface electrodes to conduct said calibration current; third and fourth calibration conductors disposed on said substrate and coupled to said first and second calibration electrodes to convey said calibration voltage; a fifth calibration conductor disposed on said substrate and to be coupled to one of said first and second calibration electrodes and conduct said calibration current; first and second signal electrodes disposed on said substrate to convey a differential signal having a signal voltage and a signal current; first and second signal conductors disposed on said substrate and coupled to said first and second signal electrodes to conduct said signal current; third and fourth signal conductors disposed on said substrate and coupled to said first and second signal electrodes to convey said signal voltage; and integrated calibration and differential signal receiver circuitry coupled to said first, second, third, fourth and fifth calibration conductors and said first, second, third and fourth signal conductors, and including current source circuitry to provide said calibration current, first conductive circuitry to conduct said calibration current and including a resistance having a magnitude related to one or more control signals, wherein said calibration voltage has a magnitude related to said conduction of said calibration current by said first and second calibration conductors and said first conductive circuitry resistance, control circuitry coupled to said first conductive circuitry to sense said calibration voltage and in response thereto provide said one or more control signals, second conductive circuitry to conduct said signal current and including a resistance having a magnitude related to at least one of said one or more control signals, wherein said signal voltage has a magnitude related to said conduction of said signal current by said first and second signal conductors and said second conductive circuitry, and amplifier circuitry to sense said signal voltage and in response thereto provide a corresponding output signal.