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Tracking voltage regulator for a subscriber line i

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专利内容由知识产权出版社提供

专利名称:Tracking voltage regulator for a subscriber

line interface circuit

发明人:Russell J. Apfel申请号:US115878申请日:20061227

公开号:US20080159525A1公开日:20080703

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

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