Linear-in-dB variable gain amplifier

Details Linear-in-dB variable gain amplifier Linear-in-dB variable gain amplifier

2008-04-14

2010-06-22

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07741909

ABSTRACT:
A variable gain amplifier (VGA) with a gain thereof exponential to a control voltage thereof. The variable gain amplifier (VGA) comprises an exponential DC converter, and a linear voltage multiplier. The exponential DC converter receives the control voltage and generates an exponential voltage which is exponential to the control voltage. The linear voltage multiplier is coupled to the exponential DC converter and has a gain proportional to the exponential voltage of the exponential DC converter.

REFERENCES:
patent: 5570056 (1996-10-01), Groe
patent: 5880631 (1999-03-01), Sahota
patent: 5886579 (1999-03-01), Mangelsdorf
patent: 6583667 (2003-06-01), Dasgupta et al.
patent: 6777999 (2004-08-01), Kanou et al.
patent: 6791413 (2004-09-01), Komurasaki et al.
patent: 2005/0195035 (2005-09-01), Hu
patent: 2007/0072569 (2007-03-01), McCarthy et al.
“An All CMOS 84dB-Linear Low-Power Variable Gain Amplifier” Duong et al.; 2005 Symposium on VLSI Circuits Digest of Technical Papers; pp. 114-117.

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