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Digitally controlled linear-in-dB variable-gain amplifier for high-frequency applications

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3 Author(s)
Italia, A. ; DIEES, Univ. di Catania, Catania ; Ragonese, E. ; Palmisano, G.

A design technique to implement a digitally controlled dB-linear variable-gain amplifier (VGA) for high-frequency applications is presented. The design approach is applicable to current-steering VGAs and is based on a digital gain control circuit that operates as a nonlinear digital-to-analogue converter to achieve a digitally controlled dB-linear gain control characteristic. Using the proposed approach, a variable-gain up-converter for 5-GHz wireless LAN applications has been fabricated with a low-cost 46-GHz-frceil silicon bipolar technology. The adopted VGA, operating at a frequency of 1 GHz, provides a linear-in-dB gain control characteristic over a 30-dB dynamic range with a 2-dB step and a +0.8-dB gain error.

Published in:

Circuits, Devices & Systems, IET  (Volume:1 ,  Issue: 6 )