A 35 dB-linear exponential function generator for VGA and AGC applications

Authors:
Quoc-Hoang Duong;Sang-Gug Lee
Affiliations:
Information and Communication University Hwaam-Dong, Yuseong-gu, Daejeon, South Korea;Information and Communication University Hwaam-Dong, Yuseong-gu, Daejeon, South Korea
Venue:
Proceedings of the 2004 Asia and South Pacific Design Automation Conference
Year:
2004

Citing 3
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Abstract

In this paper, a new current-mode based exponential function generator with high dB-linear range is developed. The exponential function is based on Taylor's concept. The proposed circuit is composed of current-to-current squarers, current multipliers, and a linear V-I converter with linearization technique. Based on a 0.25 μm CMOS process, the simulations show a 35 dB-linear output current range with the linearity error less than ± 0.5 dB. The power dissipation is less than 0.3 mW at 1.25 V supply voltage.