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High-dynamic-range VGA with temperature compensation and linear-in-dB gain control

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2 Author(s)
Carrara, F. ; Dipt. di Ingegneria Elettrica Elettronica e dei Sistemi, Univ. di Catania, Italy ; Palmisano, G.

This paper presents the design and measured performance of a novel intermediate-frequency variable-gain amplifier for Wideband Code-Division Multiple Access (WCDMA) transmitters. A compensation technique for parasitic coupling is proposed which allows a high dynamic range of 77 dB to be attained at 400 MHz while using a single variable-gain stage. Temperature compensation and decibel-linear characteristic are achieved by means of a control circuit which provides a lower than ±1.5 dB gain error over full temperature and gain ranges. The device is fabricated in a 0.8-μm 46 GHz fT silicon bipolar technology and drains up to 6 mA from a 2.7-V power supply.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:40 ,  Issue: 10 )

Date of Publication:

Oct. 2005

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