Impedance synthesis multile loop using filtering means
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United States of America Patent
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Aug 30, 1994
Grant Date -
N/A
app pub date -
May 13, 1991
filing date -
May 11, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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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