Amplifiers – With periodic switching input-output
Reexamination Certificate
2006-03-21
2006-03-21
Callahan, Timothy P. (Department: 2816)
Amplifiers
With periodic switching input-output
C330S279000, C327S341000, C327S562000
Reexamination Certificate
active
07015750
ABSTRACT:
A system for receiving signals (e.g., optical signals) includes an input device, an amplification device, and a feedback device. The amplification device receives a signal from the input device and includes a transimpedance portion. The transimpedance portion includes a first section having a plurality of elements (e.g., resistors and transistors) and a second section having a plurality of elements (e.g., resistors and transistors). One or more of the elements (e.g. transistors or resistors) in the first and second sections are mismatched to introduce a systematic offset in the transimpedance stage, to make the net input referred offset of the amplification device unidirectional. The feedback device (e.g. an integrator) is coupled to an output of the amplification device and an input of the transimpedance portion to provide a unidirectional offset correction to the amplification device for reduced noise enhancement.
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Copy of European Search Report for European Appln. 03019210.8-2215, dated Oct. 28, 2004.
Callahan Timothy P.
Nguyen Hai L.
Sterne Kessler Goldstein & Fox P.L.L.C.
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