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A tunable CMOS transconductor is presented. Input rail-to-rail operation is achieved using floating-gate MOS (FGMOS) transistors. Tuning is also obtained using FGMOS transistors, which are biased in weak or moderate inversion to achieve precise output current scaling. A technique to set the proper transconductance value independently of process or temperature variations is also included. Measurement...
A family of tunable MOS resistors based on quasi-floating-gate (QFG) transistors biased in the triode region is analyzed in this paper. From the study results, a new device that outperforms previous implementations, is presented. By means of a capacitive divider, the ac component of the drain-to-source voltage scaled with a factor alpha les 1 is added to the gate-to-source voltage leading to a cancellation...
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