Switched mode current feed methods for telephony subscriber loops
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United States of America Patent
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N/A
Issued Date -
Aug 15, 2002
app pub date -
Dec 10, 2001
filing date -
Dec 11, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A subscriber loop interface circuit employs a high efficiency constant DC current source implemented using either a switched-mode current boost converter or a switched-mode voltage-to-current trans-converter. The constant DC current source provides higher efficiencies than that achievable using constant voltage sources while presenting a high impedance to voice band signals.
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