Patent ID: 7034604

Claim:
A communication device for use with a communication line, the communication device powered by a host device, the communication device comprising: a full wave bridge rectifier operatively coupled to the host device and responsive to at least one host output signal from the host device to produce at least one of (a) a positive rectified voltage signal and (b) a negative rectified voltage signal; a first voltage regulator circuit configured to provide a first positive regulated signal to a positive voltage rail of the communication device in response to receipt of the positive rectified voltage signal; a second voltage regulator circuit configured to provide a negative regulated signal to a negative voltage rail of the communication device in response to receipt of the negative rectified voltage signal; and a charge pump circuit operatively coupled to the positive voltage rail and the negative voltage rail, the charge pump circuit configured to: provide a supplemental first positive regulated signal to the positive voltage rail and a supplemental negative regulated signal to the negative voltage rail when the at least one host output signal is a positive voltage signal, provide the supplemental first positive regulated signal to the positive voltage rail and the supplemental negative regulated signal to the negative voltage rail when the at least one host output signal is a negative voltage signal, and provide the supplemental first positive regulated signal to the positive voltage rail and the supplemental negative regulated signal to the negative voltage rail when the at least one host output signal transitions between the negative voltage signal and the positive voltage signal.