Transceiver front-end for communication over power lines

摘要

Various circuits and methods are disclosed for communications over AC power lines. In one example embodiment, a power line communication circuit includes an analog front end having a data-coupling circuit configured to communicatively couple communication signals to and from a set of AC power lines in the power line communication system. The analog front end also includes a noise reduction circuit that is coupled to the data-coupling circuit. The noise reduction circuit is configured to mitigate noise within a communication frequency band of the communication signals by filtering, from the communication signals, at least one frequency that is located outside of the communication frequency band and that has harmonics located within the communication frequency band. A receiver circuit is coupled to the noise reduction circuit and is configured to demodulate data from the communication frequency band of the filtered communication signals.

主权项

1. For use in a power line communication system, a power line communication circuit comprising:
an analog front end circuit including
a data-coupling circuit configured and arranged to communicatively couple communication signals between the data-coupling circuit and a set of alternating current (AC) power lines in the power line communication system, whereby the data-coupling circuit is used to communicate the communication signals carried by the power line communication system, anda noise reduction circuit coupled to the data-coupling circuit and configured and arranged to mitigate noise within a communication frequency band of the communication signals by filtering, from the communication signals, signals corresponding to a first frequency at 30 kHz that is located outside of the communication frequency band and that has harmonics located within the communication frequency band and by filtering signals corresponding to a second frequency, that is twice the first frequency located outside of the communication frequency band; and a receiver circuit coupled to the noise reduction circuit and configured and arranged to demodulate the filtered communication signals in the communication frequency band.