Patent ID: 7170394

Claim:
A host device couplable to a remote device via a single wire pair, said single wire pair comprising a first wire and a second wire, said remote device comprising first remote signal generation circuitry operable to generate a first remote signal and a first remote current modulator operable to modulate a current component of a power signal present on said single wire pair with said first remote signal when said first remote signal is communicated to said host device, said host device comprising: a voltage reference and control loop circuit which generates and enforces a substantially constant voltage component of said power signal present on said single wire pair during communication between said first remote signal to said host device and said host device to said first remote device; and a first host current de-modulator operable to de-modulate said first remote signal from said current component of said power signal present on said single wire pair during communication of said first remote signal to said host device.