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High performance analog VLSI computational circuits

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3 Author(s)
Zarabadi, S.R. ; Delco Electron. Corp., Kokomo, IN, USA ; Ismail, M. ; Chung-Chih Hung

Simple linear voltage/current-controlled voltage-to-current (V-T) converters, which are to first-order insensitive to the threshold voltage variation, are introduced. The circuits can be used as basic building blocks to construct simple analog computational circuits, which can perform functions such as square rooting, squaring, multiplication, sum of squares, difference of squares, etc. Some of the key features are: good linearity, floating inputs [high common-mode rejection ratio (CMRR)], simplicity, and good transconductance tuning range. The circuits can be realized with CMOS devices in saturation, however, BiCMOS devices extend their speed and input voltage range. Realistic simulations and experimental results clearly demonstrate the claims

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:33 ,  Issue: 4 )