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A BiCMOS low distortion tunable OTA for continuous-time filters

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4 Author(s)
Ali, M.I. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Howe, M. ; Sanchez-Sinencio, E. ; Ramirez-Angulo, J.

The use of electronically programmable, bipolar current mirrors in conjunction with a BiCMOS linearized differential input stage produces a linearized transconductance amplifier with an extended high-frequency transconductance adjustment range. Both linearity and transconductance excess phase are largely independent of the transconductance gain over the range of adjustment. HSPICE results show that, for a modest BiCMOS 2-μm technology (MOSIS) with a ±2.5-V power supply, a decade of adjustment is obtained for a 2-V p-p input signal with less than 1% distortion, and from a simple phase compensation scheme the excess phase can be kept below 1° for up to 25 MHz. The tuning range and linear operation of a low-frequency version of the OTA are experimentally demonstrated using transistor array ICs

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:40 ,  Issue: 1 )