专利名称：Tracking voltage regulator for a subscriber
line interface circuit
发明人：Russell J. Apfel申请号：US11645878申请日：20061227公开号：US08249247B2公开日：20120821
专利附图：
摘要：In one embodiment, the present invention includes an apparatus having a firstpair of low voltage operational amplifiers to generate an output representative of anabsolute value difference of first and second line voltages of a subscriber loop, and a
third low voltage operational amplifier having an input coupled to the output of the firstpair of low voltage operational amplifiers to filter the output and to provide a switchcontrol signal for a switching regulator that provides a voltage used to generate the firstand second line voltages. The apparatus may include additional circuits such as a limitcircuit to limit the input to the third low voltage operational amplifier and one or morespeedup circuits to reduce a filter time constant of the third low voltage operationalamplifier during a ringing mode of the subscriber loop.
申请人：Russell J. Apfel
地址：Austin TX US
国籍：US
代理机构：Trop, Pruner & Hu, P.C.
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