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United States of America Patent
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N/A
Issued Date -
Dec 27, 2001
app pub date -
Dec 16, 1998
filing date -
Dec 16, 1998
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A ring detect/Caller I.D. detect circuit employs first and second operational amplifiers supplied with a differential input from the AC side of a diode bridge. The differential input is converted to a single ended input supplied in a first mode to a ring detect comparator supplied with a plurality of selectable reference voltages and in a second mode to a comparator which produces a digital Caller I.D. output signal. An impedance in the feedback loop of the first and second operational amplifiers is switch-selectable to enable the first and second modes of operation, and each of the selectable reference voltages is chosen to permit proper ring signal detection in a particular corresponding geography.
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