| 摘要 |
PROBLEM TO BE SOLVED: To provide a large-bandwidth and high-gain transimpedance amplifier (TIA) suitable for a photosensor of an optical fiber receiver or an amplifier of a preamplifier writer for high-speed hard disk drive. SOLUTION: A nested transimpedance amplifier (TIA) circuit includes a zero-order TIA having an input and an output, and a first operational amplifier (opamp). The opamp includes an input that communicates with the output of the zero-order TIA, a first transistor driven by the input, a second transistor that is driven by a first bias voltage and communicates with the first transistor, a first current source that communicates with the second transistor, and an output at a node between the first transistor and the second transistor. COPYRIGHT: (C)2007,JPO&INPIT
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