Method and device for providing broadband over power line communications
View Patent ↗A transmit and receive circuit for use in power line communication devices is provided. One embodiment of the circuit includes a receive channel with a first delay circuit coupled to a first switch having an open configuration and a closed configuration a first switch. The circuit also may include a transmit channel coupled to the receive channel at a node and including a second delay circuit coupled to a second switch having an open configuration and a closed configuration. When the switch of either channel is closed, the switch of the other channel is open. Data signals traversing either channel when that channel's switch is closed, are phase shifted approximately three hundred and sixty degrees and conducted back to the node.
1. A device for communicating broadband data signals over a power line, comprising:
a port configured to be coupled to the power line;
a node coupled to said port;
a transmit portion and a receive portion coupled to each other at said node;
each of said transmit portion and said receiver portion comprising
a delay circuit coupled to said node and configured to delay the data signals, and
a switch coupled to said delay circuit, said switch having an open configuration and a closed configuration; and
wherein the broadband data signals are communicated in a frequency band and wherein each said delay circuit is configured to delay data signals substantially the same amount across substantially the entire frequency band.
2. The device of claim 1 , wherein said delay circuit is configured to provide a delay of approximately one-quarter wave length of a plurality of carriers used to communicate the data signals.
3. The device of claim 1 , wherein said switch of said transmit portion is in one configuration of said open configuration and said closed configuration when said switch of said receive portion is in another configuration of said open configuration and said closed configuration.
4. The device of claim 1 , wherein said delay circuit is a balanced circuit.
5. The device of claim 1 , wherein said delay circuit is an unbalanced circuit.
6. The device of claim 1 , wherein said delay circuit comprises a delay line.
7. The device of claim 1 , wherein said delay circuit comprises an inductor capacitor (LC) circuit.
8. The device of claim 7 , wherein said LC circuit comprises a lattice network.
9. The device of claim 1 , wherein the frequency band is greater than ten megahertz in bandwidth.
10. The device of claim 1 , wherein the frequency band is greater than twenty megahertz in bandwidth.
11. The device of claim 1 , wherein said port includes a first conductor and a second conductor each configured to be coupled to different power line conductors.
12. The device of claim 1 , wherein said delay circuit comprises an all pass network circuit.
13. A device for communicating broadband data signals communicated in a frequency band over a power line, comprising:
a receive channel comprising a first switch;
a transmit channel coupled to said receive channel;
wherein said transmit channel comprises a delay circuit coupled to a second switch having an open configuration and a closed configuration; and
wherein said delay circuit is configured to delay data signals substantially the same amount across substantially the entire frequency band.
14. The device of claim 13 , wherein said delay circuit is configured to provide a delay of approximately one-quarter wave length to a plurality of carriers in the frequency band.
15. The device of claim 13 , wherein said delay circuit comprises a delay line.
16. The device of claim 13 , wherein said delay circuit comprises an LC circuit.
17. The device of claim 16 , wherein said LC circuit comprises a lattice network.
18. The device of claim 13 , wherein said delay circuit comprises an all pass network circuit.
19. The device of claim 13 , wherein said receive channel further comprises a delay circuit coupled to said first switch and wherein said first switch has an open configuration and a closed configuration.
20. A device for communicating broadband data signals communicated in a frequency band over a power line, comprising:
a receive channel comprising a first delay circuit coupled to a first switch having an open configuration and a closed configuration;
a transmit channel coupled to said receive channel and comprising a second delay circuit coupled to a second switch having an open configuration and a closed configuration; and
wherein each of said first delay circuit and said second delay circuit are configured to delay data signals substantially the same amount across substantially the entire frequency band.
21. The device of claim 20 , wherein the frequency band is greater than twenty megahertz in bandwidth.
22. The device of claim 20 , wherein said delay circuit is configured to provide a delay of approximately one-quarter wave length to a plurality of carriers used to communicate the data signals.
23. The device of claim 20 , wherein said first switch is in one configuration of said open configuration and said closed configuration when said second switch is in another configuration of said open configuration and said closed configuration.
24. The device of claim 20 , wherein said delay circuit comprises a lattice network.
25. The device of claim 20 , wherein:
said transmit channel is coupled to said receive channel at a first node; and
when said second switch is in said closed configuration, a portion of the data signals entering the device enter said transmit channel and return to said node with approximately a three hundred sixty degrees phase shift across the entire frequency band of data signals.
26. The device of claim 20 , wherein:
said transmit channel is coupled to said receive channel at a first node and said transmit channel includes an amplifier configured to output data signals; and
when said first switch is in said closed configuration, a portion of the data signals outputted by said amplifier enter said receive channel and return to said node with approximately a three hundred sixty degrees phase shift across the entire frequency band of data signals.
27. The device of claim 20 , wherein said receive channel and said transmit channel each comprise a first and second conductive path.
28. The device of claim 27 , wherein said first and second conductive paths are communicatively coupled to a first and second power line conductor, respectively.
29. A method for communicating broadband data signals over a power line, comprising:
receiving broadband data signals from a power line;
conducting the data signals to a receive channel and a transmit channel;
phase shifting the data signals conducted to the transmit channel by approximately three hundred and sixty degrees; and
conducting the phase shifted data signals to the receive channel.
30. The method of claim 29 , wherein said phase shifting is performed with a delay circuit and a switch.
31. The method of claim 29 , wherein the receive channel and the transmit channel each comprise two conductive paths.
32. The method of claim 29 , wherein said receiving includes receiving the broadband data signals from a first and second power line conductor.