Amplifiers – With semiconductor amplifying device – Including atomic particle or radiant energy impinging on a...
Reexamination Certificate
2000-01-06
2001-08-14
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including atomic particle or radiant energy impinging on a...
C250S2140AG
Reexamination Certificate
active
06275114
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to fiber optic communication, and more particularly, to transimpedance amplifiers used in formatting fiber optic communication data.
2. Description of Related Art
Low-cost, high-performance, highly integrated fiber optic interface circuits are becoming increasingly necessary to meet the demands of high-speed digital data communication. With the advent of Gigabit Ethernet systems, for example, fiber optic technology has become increasingly preferred. One standard circuit function for fiber optic communication systems is a transimpedance amplifier that is used within an optical receiver. Transimpedance amplifiers are employed in optical receivers in order to convert very small currents indicative of optical signals applied to photodiode detectors. These small currents are then converted to signal voltages of greater amplitude. In an optical fiber communications network where a plurality of geographically distributed users each write onto a common optical fiber, incoming optical signals from a nearby transmitter may be detected at a high signal level, whereas incoming optical signals from a distant transmitter may be detected at very low signal levels. As such, to be effective, a transimpedance amplifier desirably should be able to detect all levels of signals and transmit these signals without loss of signal bandwidth to components that are physically distinct from the transimpedance amplifier.
SUMMARY OF THE INVENTION
To achieve the above desires, a transimpedance amplifier according to the present invention is designed for high-speed fiber optic communications. The transimpedance amplifier preferably includes an input stage, a second stage and a bias generator. The input stage is operably coupled to the second stage and has an input impedance. The second stage has an output impedance. The bias generator is operably coupled to the input stage and the second stage and operates to bias the input and second stage such that the input impedance substantially matches the output impedance. In this manner, the input and output impedances of a transimpedance amplifier of a fiber optics communication receiver are controllable to a desired impedance for interfacing with a transmission line.
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Stronczer John J.
Tanji Todd M.
Applied Micro Circuits Corporation
Gary Cary
Nguyen Patricia T.
Pascal Robert
LandOfFree
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