A linear CMOS transconductance element of an adaptively biased source-coupled differential pair using a quadritail cell |
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Authors: | Katsuji Kimura |
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Affiliation: | (1) Fundamental Technologies Development Department-I, Mobile Communications Division, NEC Corporation, 224 Yokohama-shi, Japan |
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Abstract: | A novel circuit design technique for realizing a linear CMOS transconductance element, consisting of an adaptively biased source-coupled differential pair using a quadritail cell, is proposed. In the circuitry, the quadritail cell, which provides an output current proportional to the square of a differential input voltage, cancels a nonlinear term of the source-coupled differential pair. The circuit have a superior linearity and a wide linear input voltage range compared with the conventional linear CMOS transconductance elements because the transconductance characteristic is theoretically linear over wide input voltage range when all the MOS field-effect transistors (MOSFETs) are operating in the saturation region and the MOSFETs' behaviors are according to the relation based on the square-law characteristic. The proposed adaptively biased source-coupled differential pair was verified by using transistor-arrays and discrete components on a breadboard. |
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Keywords: | adaptive-biasing quadritail cell OTA CMOS |
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