Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa
Reexamination Certificate
2006-08-29
2006-08-29
Nguyen, Linh V. (Department: 2819)
Amplifiers
With semiconductor amplifying device
Including balanced to unbalanced circuits and vice versa
C330S051000
Reexamination Certificate
active
07098742
ABSTRACT:
An input stage for an integrated circuit device provides constant gain in selectable modes of either differential or single-ended operation. In one embodiment, transconductance devices are arranged so that the input impedance of the input stage matches the signal source impedance, regardless whether the input stage is selected to operate in a differential mode or in a single-ended mode. In accordance with an alternative embodiment, constant-gain and constant-impedance conditions are maintained in a configuration that comprises and input signal attenuator. In one application, the input stage may serve as a low-noise amplifier (LNA) for an integrated transceiver.
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PCT/US2005/009752 International Search Report with Written Opinion of the International Searching Authority Mailed Oct. 21, 2005.
Nguyen Linh V.
Silicon Laboratories Inc.
Trop Pruner & Hu P.C.
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