发明公开
- 专利标题： Battery feed system
- 专利标题（中）： 电池说话系统
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申请号： EP85305020.1申请日： 1985-07-15
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公开(公告)号： EP0169696A2公开(公告)日： 1986-01-29
- 发明人: Smith, Douglas Charles
- 申请人： AT&T Corp.
- 申请人地址： 32 Avenue of the Americas New York, NY 10013-2412 US
- 专利权人： AT&T Corp.
- 当前专利权人： AT&T Corp.
- 当前专利权人地址： 32 Avenue of the Americas New York, NY 10013-2412 US
- 代理机构： Buckley, Christopher Simon Thirsk
- 优先权： US633478 19840723
- 主分类号： H04M19/00
- IPC分类号： H04M19/00
摘要：
Resistive battery feed circuits are normally not used because of lack of power supply noise rejection and attendant crosstalk coupling. In this circuit the opamp (A1) and surrounding circuitry (Q1, Q2, Q10, C1, C2, 1R1, 1R2, R5) insure that power supply and ground noise do not couple into the tip and ring circuits (R1, T1, R2, T2) as a metallic signal and improve crosstalk attenuation. In additon, the opamp is used to split the 48 volts supply.
公开/授权文献
- EP0169696B1 Battery feed system 公开/授权日：1990-10-10
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