A 2.5mW inductorless wideband VGA with dual feedback DC-offset correction in 90nm CMOS technology

Abstract

A low power inductorless wideband variable gain control amplifier (VGA) for baseband receivers has been designed in a standard digital 90nm CMOS technology. The VGA was implemented using four-stage modified Cherry-Hooper amplifier with a dual feedback DC-offset canceling network, which simultaneously corrects DC offsets and extends bandwidth without a peaking inductor resulting in saving the chip space significantly. The proposed VGA has been measured using on-chip probing and achieves a 3-dB bandwidth of more than 2.2GHz with 60dB gain tuning range. It consumes 2.5mW through a 1V supply (excluding the output buffer), and occupies only 0.01mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> active area.