Patent ID: 8175555

Claim:
A power recovery circuit of a transmitter for recovering power from the terminating resistors of a termination power supply comprising: a bias control circuit having at least a pair of current sensing and control elements coupled to connected sources of a differential driver pair to provide a predetermined bias to the connected sources, the differential driver pair being coupled to the terminating resistors; a startup circuit coupled to the terminating resistors, the startup circuit enabled to provide an initial starting bias voltage and current to the bias control circuit when the termination power supply is enabled; and a voltage regulator having an input coupled to an output of the bias control circuit to regulate an output voltage of the power recovery circuit; the power recovery circuit using current supplied to the differential driver pair from the termination power supply and the voltage at the connected sources of the differential driver pair to provide regulated power from the voltage regulator to at least a portion of the peripheral circuits of the transmitter.