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US 6,639,472 B2Granted
High bandwidth, low power, single stage cascode transimpedance amplifier for short haul optical links
AssigneeIntel Corporation
InventorsTimothy M. Wilson, Tanay Karnik, Luiz M. Franca-Neto
Life of this patent
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Abstract
A high bandwidth, single stage, low power cascode transimpedance amplifier for short haul optical links. In one embodiment, an input signal is fed into the source of a common-gate pMOSFET, the output signal is taken at the drain of the common-gate pMOSFET, and bias current is supplied by a pMOSFET and a nMOSFET biased in their triode regions.
Claims6
An amplifier comprising:
- an input port;
- an output port;
- a ground to provide a ground voltage;
- a power rail to provide a power voltage;
- a bias circuit to provide a bias voltage between the ground voltage and the power voltage;
- a common-gate transistor comprising a gate biased by the bias circuit, a source connected to the input port;
- and a drain connected to the output port;
- and
- a pMOSFET and a nMOSFET to provide bias current to the common-gate transistor, the pMOSFET comprising a gate connected to the ground, and a drain;
- and the nMOSFET comprising a gate connected to the power rail, and a drain.
7 more elements
A computer system comprising:
- a photodetector comprising an output port;
- and
- an amplifier comprising:
- an output port;
- a ground to provide a ground voltage;
- a power rail to provide a power voltage;
- a bias circuit to provide a bias voltage between the ground voltage and the power voltage;
- a common-gate transistor comprising a gate biased by the bias circuit, a source connected to the photodetector output port;
- and a drain connected to the amplifier output port;
- and
- a pMOSFET and a nMOSFET to provide bias current to the common-gate transistor, the pMOSFET comprising a gate connected to the ground, and a drain;
- and the nMOSFET comprising a gate connected to the power rail, and a drain.
9 more elements
Dependencies are inferred from the claim text.