Receiver for a distribution network power line carrier communication system
April 9, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3857048 3868605 3898573 Power line carrier communication system for signaling customer locations through ground wire conductors Method and system for controlling peak signal levels in a bandlimited recording or transmission system employing high-frequency pre-emphasis Dynamic transient response filter High voltage signal coupler for a distribution network power line carrier communication system Borehole acoustic telemetry system synchronous detector Patent #: 4298970 InventorsAssigneeApplicationNo. 06/252664 filed on 04/09/1981US Classes:307/3, Different frequencies or phase307/106, WAVE FORM OR WAVE SHAPE DETERMINATIVE OR PULSE-PRODUCING SYSTEMS327/309, By limiting, clipping, or clamping327/330, With rectifier or nonlinear impedance333/173, Synchronous filters340/538.11, Modulation technique455/402Over power lineExaminersPrimary: Yusko, Donald J.Attorney, Agent or FirmInternational ClassesH04B 3/54 (20060101)H04B 3/56 (20060101) H04L 27/22 (20060101) AbstractA receiver for a distribution network power line carrier communication system is magnetically coupled to a distribution power line. A carrier signal, phase-shift keyed modulated by an information signal and carried by the distribution power line, is thereby coupled to the receiver circuitry. A first receiver amplification circuit includes an automatic gain control circuit, to prevent saturation of the receiver electronics, and a feedback circuit to determine the gain. The automatic gain control circuit utilizes a field effect transistor which cooperates with the amplifier's feedback circuit to modify the gain. The drain source resistance of the field effect transistor is varied in accord with the magnitude of the received noise or modulated carrier signal to lower the amplifier's gain when excessive positive or negative noise or modulated carrier signal peaks are encountered. The modulated carrier signal is then processed through several filter stages and further amplified. Finally, the information signal is removed from the modulated carrier by a phase shift keyed demodulator. The information is available for input to a remote device which is responsive thereto for performing any of a variety of automated functions.Other References
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