摘要:
An isolator 10 is formed with an isolation transformer 13 that blocks an abnormal voltage entering from a communication line 30 and protects a protection target device 40. A pulse transformer 43 in the device 40 includes a primary winding 43a connected to a secondary winding 13b of the transformer 13 and a secondary winding 43b connected to an inner circuit. A medium tap of the primary winding 43a is grounded through an inner capacitance Ci of the device 40. A parasitic capacitance Cs between the primary winding 13a and the secondary winding 13b of the transformer 13 and the inner capacitance Ci are connected in series, an abnormal voltage is divided by the capacitance Cs and the capacitance Ci, and a capacitance value of the capacitance Cs is set such that the divided voltage of the capacitance Ci is equal to or below a predetermined value.
摘要:
The present invention relates to a method for increasing the performance of a communications system on a medium formed by multiple conductors which increases the performance of a communications system by means of creating multiple communication channels with a high degree of isolation between one another on one and the same physical medium formed by multiple conductors. The method can be extended to be used in several applications, such as the reuse of frequencies on one and the same channel, the increase of the capacity of the point-to-point links in a network and the improvement of performance and reliability when used with digital processing of signals at transmission or reception, among others.
摘要:
Systems and methods for power line transmission are disclosed in which transmitters and receivers are connected to one or more phases of the power line. At least one symbol stream to be transmitted on the power line network is generated. The at least one symbol stream is scaled using a weight vector to generate a plurality of scaled symbol streams. The weight vector comprises a plurality of weights, each corresponding to a phase of the power line network. Each of the scaled symbol streams are transmitted on a corresponding phase of the power line network. A zero crossing detector identifies phase information for a receiver. A concentrator adapts signals to be sent to the receiver based upon the phase associated with the receiver.
摘要:
A receiver system for an on-off key ("OOK") isolator system may include a pair of receivers. A first receiver may generate a first current signal representing a received OOK signal, and a second receiver may generate a second current signal from a common mode representation of the received OOK signal. The receiver system may include circuitry to compare the first and second current signals and generate an output signal therefrom.
摘要:
The invention relates to an apparatus comprising a differential driver module configured to generate at least one differential signal having steep rise and fall times for at least partially reducing common-mode noise. The invention also relates to a method for causing the differential driver to generate the signal and a system comprising the differential driver and a conductor module for transmission of the generated differential signal. A computer program for performing the method and a computer-readable medium is also part of the invention.
摘要:
Which permits the application of methods for increasing the performance of a communications system on a medium made up of N conductors (5 1 - 5 N ) and a reference plane (6) by means of injecting voltage signals (4 1 - 4 N ) in up to N combinations of the conductors, including injection in common mode, such that said injected signals can be made to be orthogonal to each other.
摘要:
The invention relates to a device with two line pairs (16a; 16b) which comprise a first and a second channel. The device further comprises a phantom channel which is designed to provide a third channel without having to physically install lines. A first common-mode signal level (33a) is generated at a first output of a differential amplifier circuit, and a second common-mode signal level (33b) is generated at a second output on the basis of a differential signal. The first common-mode signal level (33a) is applied to the lines of the first line pair (16a), and the second common-mode signal level is applied to the lines of the second line pair (16b). An extraction circuit (39) is designed to extract common-mode components on the lines of the first line pair (16a) and the lines of the second line pair (16b).
摘要:
In general, the present invention provides methods and apparatuses for exploiting the extra degree of freedom provided by the sensing of the CM signal along with the DM signal at the receiver end of a wireline communication system. According to certain aspects, this extra degree of freedom can be used to cancel alien noises at the receiver in both upstream downstream directions. According to further aspects, a CM channel can be potentially used to exploit the diversity created in the CM channel along with the regular DM channel. This acts as the motivation for employing a diversity receiver scheme at the receiver, especially in downstream communications received at a Customer Premises.