Variable-gain image-reject low-noise amplifier

Details Variable-gain image-reject low-noise amplifier Variable-gain image-reject low-noise amplifier

2008-05-27

2009-12-08

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S284000

Reexamination Certificate

active

07629850

ABSTRACT:
A variable-gain amplifier includes an intermediate node operative to receive an electric current from a current source. A common-emitter amplifier has a collector electrically connected to the intermediate node. A first common-base amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to an output node. A base-degenerated amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to the output node. A second common-base amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to small-signal ground. The intermediate node is operative to direct the electric current to the first common-base amplifier, thereby causing the variable-gain amplifier to operate in a first mode; and the intermediate node is operative to direct the electric current to the base-degenerated amplifier and the second common-base amplifier, thereby causing the variable-gain amplifier to operate in a second mode.

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S. Reynolds et al., “A Direct-Conversion Receiver Integrated Circuit for WCDMA Mobile Systems”, IBM J. Res. & Dev., Mar./May 2003, p. 337-363, vol. 47 No. 2/3.

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