发明名称 |
Circuits and methods for detecting the presence of a powered device in a powered network |
摘要 |
Circuits and methods for detecting the presence of a powered device in a powered network connection and removing power from the powered network connection when no powered device is present are disclosed. The circuits and methods involve applying a time-varying voltage signal into an analog amplifier circuit that converts the voltage into a current indicative of the impedance of the connection. The analog amplifier circuit may be implemented with a dual-output trans-conductance amplifier that provides a digital voltage to indicate the removal of the powered device from the powered network connection.
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申请公布号 |
US7356588(B2) |
申请公布日期 |
2008.04.08 |
申请号 |
US20030738824 |
申请日期 |
2003.12.16 |
申请人 |
LINEAR TECHNOLOGY CORPORATION |
发明人 |
STINEMAN, JR. JOHN A.;HERBOLD JACOB |
分类号 |
G06F1/26;H04B3/54;H04L12/10;H04L12/40 |
主分类号 |
G06F1/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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