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Wide dynamic range variable-gain amplifier based on new approximated exponential equation

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2 Author(s)
Q. -h. Duong ; Sch. of Eng., Inf. & Commun. Univ., Daejeon ; S. -g. Lee

A new approximated exponential equation is proposed, which offers a wide decibel linear range for use in many applications such as exponential converters, log-domain filters, variable gain amplifiers (VGAs), automatic gain control amplifiers, etc. The proposed equation is implemented into a circuit as a two-stage VGA, which is fabricated in 0.18 mum CMOS technology and offers a gain range of 90 dB (-54-36 dB) and about 82 dB with linearity error of less than plusmn1 dB. The 3 dB bandwidth is 50 MHz at a maximum gain of 36 dB and P1 dB is from -40 to -17 dBm. The power dissipation is 3.7 mA from a 1.8 V supply. The chip, excluding bond pads, occupies 0.34 mm2

Published in:

Electronics Letters  (Volume:42 ,  Issue: 23 )