Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2009-03-02
2010-06-29
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S308000
Reexamination Certificate
active
07746172
ABSTRACT:
The present invention relates to a transimpedance amplifier circuit that includes a linearized differential transimpedance amplifier, a detector, and dynamic current source circuitry, which diverts common mode currents from feedback resistors in the linearized differential transimpedance amplifier to keep the linearized differential transimpedance amplifier in a linear operating range. Magnitudes of the diverted common mode currents from the feedback resistors may be based on a detected magnitude associated with differential input signals that feed the linearized differential transimpedance amplifier. The detector provides a detector output signal to the dynamic current source circuitry based on the detected magnitude associated with the differential input signals, such that the diverted common mode currents are based on the detector output signal. The transimpedance amplifier circuit provides differential output signals that are based on amplifying the differential input signals.
REFERENCES:
patent: 6552605 (2003-04-01), Yoon
Nguyen Hieu P
Pascal Robert
RF Micro Devices, Inc.
Withrow & Terranova , PLLC
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