Tunable operational transconductance amplifier with extremely high linearity over very large input range

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Abstract
A simply fully-differential transconductor is presented that achieves, based on cancellation of first and higher order non-linearities, ±0.7% linearity error over a ±6.4V differential input range for ±5 V power supplies. Common-mode input signals are cancelled at the output. The transconductance can be tuned at least by a factor 3 and f(−3dB) is 63 MHz for 10 μm channel length.

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