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A 95-dB linear low-power variable gain amplifier

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4 Author(s)
Quoc-Hoang Duong ; Sch. of Eng., Inf. & Commun. Univ., Daejeon, South Korea ; Quan Le ; Chang-Wan Kim ; Sang-Gug Lee

An all-CMOS variable gain amplifier (VGA) that adopts a new approximated exponential equation is presented. The proposed VGA is characterized by a wide range of gain variation, temperature-independence gain characteristic, low-power consumption, small chip size, and controllable dynamic gain range. The two-stage VGA is fabricated in 0.18-mum CMOS technology and shows the maximum gain variation of more than 95 dB and a 90-dB linear range with linearity error of less than plusmn 1 dB. The range of gain variation can be controlled from 68 to 95 dB. The P1dB varies from - 48 to - 17 dBm, and the 3-dB bandwidth is from 32 MHz (at maximum gain of 43 dB) to 1.05 GHz (at minimum gain of - 52 dB). The VGA dissipates less than 3.6 mA from 1.8-V supply while occupying 0.4 mm2 of chip area excluding bondpads

Published in:

IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:53 ,  Issue: 8 )