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An MMIC low-distortion variable-gain amplifier using active feedback

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2 Author(s)
Nishikawa, K. ; NTT Wireless Syst. Labs., Kanagawa, Japan ; Tokumitsu, T.

A new low-distortion variable-gain amplifier (VGA) is proposed and analyzed. The gain of the VGA is controlled using the transconductance of a common-drain FET (CDF) in the negative feedback path. The analysis and prototype results indicate that the third-order intermodulation-distortion ratio is greatly improved at a high input power levels due to the CDF's unilateral characteristic and a reduction in the VGA's input impedance.<>

Published in:

Microwave Symposium Digest, 1995., IEEE MTT-S International

Date of Conference:

16-20 May 1995