发明名称 |
Signal modulation across capacitors |
摘要 |
A method and apparatus for communicating a modulated signal across an isolation barrier using capacitors is provided. The present invention allows low distortion communication of an audio signal across an isolation barrier without the need for a large and bulky isolation transformer. The present invention may be used to provide telephone line isolation for modem applications compliant with governmental regulations. A line interface integrated circuit (IC) may be connected directly to a telephone line and powered by the telephone line. The line interface IC may include a sigma delta modulator to communicate the receive signal across a capacitor over an isolation barrier and a digital-to-analog (D/A) converter to provide an analog transmit signal from a sigma delta bit stream communicated across a capacitor over an isolation barrier. Circuitry on the opposite side of the isolation barrier includes similar components to process the transmit and receive signals.
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申请公布号 |
US5654984(A) |
申请公布日期 |
1997.08.05 |
申请号 |
US19930161741 |
申请日期 |
1993.12.03 |
申请人 |
SILICON SYSTEMS, INC. |
发明人 |
HERSHBARGER, RUSSELL A.;DAVIES, ERIC |
分类号 |
H04B14/06;H04B5/00;H04L7/00;H04M11/06;(IPC1-7):H04B3/00 |
主分类号 |
H04B14/06 |
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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