Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-07-05
2011-07-05
Nguyen, Khanh V (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S279000, C330S302000, C330S310000
Reexamination Certificate
active
07973602
ABSTRACT:
Various amplifier configurations having increased bandwidth, linearity, dynamic range, and less distortion are shown and disclosed. To increase bandwidth in a transimpedance amplifier, a replica circuit is created to replicate a degeneration resistance, or the resistance or value that relates to a feedback resistance. From the replica circuit, the replicated values are mirrored and processed to control a FET switch which modifies a degeneration resistance. The FET switch control signal is related to the feedback resistance and modifies the degeneration resistance to thereby maintain the product of the feedback resistance and the degeneration resistance as a constant. In another embodiment, a second switch controlled by an automatic gain control signal is established between a first stage amplifier and a second stage amplifier to improve dynamic range and bandwidth without degrading other amplifier specifications.
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Ahmed Kashif A.
Shivaram Krishna
Mindspeed Technologies Inc.
Nguyen Khanh V
Weide & Miller Ltd.
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