发明名称 |
Optical power meter derived from common-mode voltage of optical transimpedance amplifier |
摘要 |
An optical transceiver with a transimpedance amplifier generates a dynamic common mode voltage of the peak-to-peak output current of the photodetector for use as an in-situ optical power meter. Peak-to-peak voltage signal are imposed on the common mode voltage so optical power measurements are obtained using preexisting electrical contacts. An nfet and a capacitor of the transimpedance amplifier smooths the peak-to-peak voltage to create the control signal for the common mode voltage. The common mode current is mirrored into a bank of pfets at the output stage to create a current sink. Depending upon the potential of the common mode voltage, more or less current will be drawn from the peak-to-peak voltage signals output from a final differential amplifier stage of the transimpedance amplifier.
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申请公布号 |
US6528777(B2) |
申请公布日期 |
2003.03.04 |
申请号 |
US20010761526 |
申请日期 |
2001.01.16 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
AMES STEPHEN J.;BAUMGARTNER STEVEN JOHN;JACKSON KENNETH PAUL;SCHOW CLINT LEE;SORNA MICHAEL A.;ZIER STEVEN JOHN |
分类号 |
H03F3/08;H03G3/30;H04B10/158;(IPC1-7):H01J40/14 |
主分类号 |
H03F3/08 |
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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