Impedance adapter for network coupler cable

Details Impedance adapter for network coupler cable Impedance adapter for network coupler cable

1996-09-19

1998-06-23

Chin, Stephen

Pulse or digital communications

Cable systems and components

333 173, 333 32, H04B 300

Patent

active

057712620

ABSTRACT:
The invention provides an impedance adapter that automaticaly switches to impedances that match network transmit/receive lines impedances (105,106) by a controlled switching of various impedances mounted serially/parallely with connected transmitter/receiver (100,101). For a high speed adapter, a balanced transmitter/receiver is required for limiting crosstalk effect due to the high transmission rate. Transmit/Receive impedance adaptation networks (102-103) are composed of serial/parallel networks of resistors and relay contacts that are switched independently by magnetic coils of an impedance switching circuit (110) and having values conformable to the various network impedances imposed by different national regulations. By using the principle of double deviation voltage technique, a measuring circuit (108) detects upward and downward voltages (VA,VB), VB amplified by 2 to generate an analog signal VS (VS=VA-2VB) to a control logic circuit (109). This circuit (109) determines if the resistors value selected by the magnetic coils of said impedance switching circuit (110) is equal or not equal to the impedance of the network lines (106,105). Thus, it compares VS to a voltage Vref (25) to generate an output which selects and activates the correct magnetic coil for changing or keeping equal the resistors of the receive/transmit impedance network (102,103) currently connected to the network lines (105,106).

REFERENCES:
patent: 5057783 (1991-10-01), Gubisch
patent: 5095231 (1992-03-01), Sartori et al.
patent: 5424692 (1995-06-01), McDonald
patent: 5459440 (1995-10-01), Claridge et al.
patent: 5596285 (1997-01-01), Marbot et al.
IEEE International Solid State Circuits Conference, vol. 36, 1993 New York US, pp. 164-165, XP 000388065 Andre Dehon, "TP 10.7: Automatic Impedance Control".

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