Impedance synthesis multile loop using filtering means

Details Impedance synthesis multile loop using filtering means Impedance synthesis multile loop using filtering means

1991-05-13

1994-08-30

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

379377, H04M 100

Patent

active

053435206

ABSTRACT:
To supervise a telephone subscriber line (v'2, v'1,) and provide it with adjustable AC and DC termination impedances from the exchange (v1, v2), these are supplied by an impedance synthesis multiple loop split into separate DC and AC loop parts by filters at the output of a sense amplifier in the common loop part and fed (e) through a Herter bridge. The amplifier AC output has however to be limited to avoid saturation by a larger DC signal. It now includes a Miller effect integrator output stage (A2) with a low pass frequency response supplying the DC loop and also feeding back an input stage (A1) so that the latter exhibits a high pass frequency response with a DC free output to drive the AC loop and the consequent ability to supply a larger AC output. Further circuits improve dial pulse detection (LP), reduce external capacitances (C1) and limit power consumption (PG5 and PG6).

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Jozef F. Pieters, et al., "A Monolithic 70-V Subscriber . . .", IEEE Journal of Solid-State Circuits, vol. sc-21, No. 2. Apr. 1986.
M. Ferry, "Trip Detecting Circuit", IBM Corp. Technical Disclosure Bulletin, vol. 20, No. 3, Aug. 1977.

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