Synthetic termination

Details Synthetic termination Synthetic termination

1997-12-17

1999-12-07

Le, N.

Telephonic communications

Substation or terminal circuitry

Impedance matching or line equalizing

379398, H04M 100

Patent

active

059996196

ABSTRACT:
A method and apparatus for actively simulating an apparent termination input impedance to a current driven data communication equipment (DCE) device is disclosed. The DCE device utilizes several components to implement the apparent termination impedance. A first component is a current driver for providing a source of current within the DCE device. The current source is configured to actively drive an input-output signal line within a communication link. The current driven DCE also includes a mechanism for sensing an input-output signal line voltage, a mechanism for converting the sensed voltage to a feed back current and an active termination for simulating an apparent termination impedance. The converting mechanism is coupled to a summation node which sums current provided from the current driver and current from the converting mechanism to force the desired termination impedance in the DCE device, whilst performing DCE current drive function.

REFERENCES:
patent: 4661978 (1987-04-01), Hirata
patent: 5121080 (1992-06-01), Scott et al.
patent: 5239580 (1993-08-01), Bruno et al.
patent: 5504811 (1996-04-01), Kiko et al.
patent: 5585763 (1996-12-01), Navabi et al.
patent: 5747893 (1998-05-01), Bennett et al.

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