发明名称 |
High bandwidth and wide dynamic range preamplifier with high stability |
摘要 |
A preamplifier includes a detector to detect an input optical power level and convert the detected input optical power level into an input current. The preamplifier also includes a transimpedance amplifier that provides a gain for the input current received from the detector. A dummy transimpedance amplifier is provided to supply a reference voltage. The dummy transimpedance amplifier has a structure similar to that of the transimpedance amplifier. A unity gain buffer is used to reduce the output impedance of the reference voltage and to output a bias voltage to both the transimpedance amplifier and the dummy transimpedance amplifier. This bias voltage can make the gate-controlled MOSFET working in its triode region, and the load resistance of the core amplifier can be easily controlled such that the gain and bandwidth of the core amplifier can be widely controlled. This results in the preamplifier having a high stability while its feedback resistor is controlled to achieve wide dynamic range.
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申请公布号 |
US6759900(B1) |
申请公布日期 |
2004.07.06 |
申请号 |
US20030342706 |
申请日期 |
2003.01.15 |
申请人 |
AGILENT TECHNOLOGIES, INC. |
发明人 |
CHEN XUE YING |
分类号 |
H03F1/36;H03F3/08;(IPC1-7):H03F1/36 |
主分类号 |
H03F1/36 |
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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