Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa
Reexamination Certificate
2007-06-19
2007-06-19
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including balanced to unbalanced circuits and vice versa
C330S259000, C330S308000
Reexamination Certificate
active
10975686
ABSTRACT:
An integrated preamplifier circuit for detecting a signal current from a photodiode and converting the signal current into an output voltage is provided. The circuit includes a signal amplifier and a dummy amplifier, the dummy amplifier being matched to the signal amplifier. Each of these amplifiers includes an input transistor and an output transistor, the input transistor of the signal amplifier receiving an input signal derived from the signal current and the input transistor of the dummy amplifier receiving no input signal. The signal and dummy amplifiers provide the desired differential output signal. The input transistors of the signal and dummy amplifiers each have a biasing current source forced to follow a reference current source implemented within the integrated circuit.
REFERENCES:
patent: 6759900 (2004-07-01), Chen
patent: 6778021 (2004-08-01), Denoyer et al.
Braier Martin
Muth Karlheinz
Schuppener Gerd
Brady W. James
Franz Warren L.
Mottola Steven J.
Teleck, Jr. Frederick J.
Texas Instruments Incorporated
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