Patent ID: 8923166
Filing Date: 2014-12-30
Classification: H04L

Abstract:
1. A downstream transceiver circuit for receiving and transmitting respectively forward channel and back channel data signals conveyed simultaneously as a composite data signal via a common conductor pair terminated at a downstream end with respective downstream coupling capacitors, comprising: downstream transceiver circuitry including a downstream signal path coupled to the downstream end of the conductor pair through the downstream coupling capacitors, including a forward channel receiver configured to receive over the downstream signal path forward channel data signals at a forward channel frequency, and a back channel driver configured to transmit over the downstream signal path back channel data signals at a back channel frequency, wherein the forward channel frequency is substantially greater than the back channel frequency; and the downstream transceiver circuitry further including: in the downstream signal path, respective filter capacitors coupled between respective downstream coupling capacitors and the forward channel receiver, with the filter capacitors having a capacitance value substantially less than that of the downstream coupling capacitors; and a replica signal driver coupled to the downstream signal path downstream from the filter capacitors between the filter capacitors and an input to the forward channel receiver, and configured to generate back channel replica signals corresponding to an inverse of the back channel data signal; wherein the back channel driver is coupled to the downstream signal path upstream from the filter capacitors between the filter capacitors and the downstream coupling capacitors; such that signal components corresponding to the back channel data signals are significantly reduced at the input to the forward channel receiver.