Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-06-07
2011-06-07
Nguyen, Hieu P (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S051000, C330S289000, C330S009000
Reexamination Certificate
active
07956689
ABSTRACT:
A programmable gain amplifier (PGA) system comprises selectable parallel transconductors in a front end, independently selectable serial amplification circuits in a back end. The back end is configured to receive an output of the front end and may include a plurality of current or voltage mode amplifiers in series. The PGA system also includes control circuitry to select a gain configuration for the PGA by selecting selectable components in the front and back ends. The PGA system may additionally include control circuitry configured to change the transconductance of one or more of the front end transconductors such that the gain configurations of the PGA are independent of variations such as those due to temperature and fabrication. The PGA system may be used between a signal receiver and an analog to digital converter.
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Bofill-Petit Adrià
Henderson Robert K.
Hurwitz Jonathan Ephraim David
Broadcom Corporation
Garlick Bruce E.
Garlick & Harrison & Markison
Nguyen Hieu P
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