Variable gain amplifier having linear-in-dB gain characteristic

Details Variable gain amplifier having linear-in-dB gain characteristic Variable gain amplifier having linear-in-dB gain characteristic

2011-01-25

2011-01-25

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S278000, C330S300000, C330S257000

Reexamination Certificate

active

07876154

ABSTRACT:
A variable gain amplifier (VGA) with a linear-in-dB gain characteristic is provided. The VGA includes: a control signal converter which converts an input gain control signal VC, which is input so that the VGA obtains a linear-in-dB gain characteristic to the maximum gain, into an output gain control signal Vx=VTln((1/m)exp(−VC/VT)−1) (m is a constant, VT=kT/q); and a variable gain amplifier which receives and converts the output gain control signal VXoutput from the control signal converter so that the gain has a linear-in-dB characteristic. A shape of a gain curve is externally controlled.

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International Search Report, Application No. PCT/KR2007/002875, Dated Sep. 27, 2007.
Written Opinion, Application No. PCT/KR2007/002875, Dated Sep. 27, 2007.

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