Linear-in-decibel variable gain amplifier

Details Linear-in-decibel variable gain amplifier Linear-in-decibel variable gain amplifier

2006-07-11

2006-07-11

Nguyen, Linh V. (Department: 2819)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S256000

Reexamination Certificate

active

07075368

ABSTRACT:
A variable gain amplifier having a linear decibel-scale gain comprises an amplifying stage for generating an output voltage according to a differential input voltage, and a gain-controlling stage for outputting a gain-controlling voltage to the amplifying stage according to a first controlling voltage and a second controlling voltage. A voltage gain of the variable gain amplifier is inversely proportional to a simple exponential function, and the value of the simple exponential function is determined by the difference between the first controlling voltage and the second controlling voltage.

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