HIGH-PERFORMANCE ANALOG VLSI COMPUTATIONAL CIRCUITS

Simple Linear voltage/current-controlled voltage-to-current (V-I) conv erters, 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 pe rform 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 (CMR R)], simplicity, and good transconductance tuning range, The circuits can be realized with CMOS devices in saturation, however, BiCMOS devic es extend their speed and input voltage range, Realistic simulations a nd experimental results clearly demonstrate the claims.