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Highly linear voltage-controlled CMOS transconductors

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3 Author(s)
Szczepanski, S. ; Dept. of Electron., Tech. Univ. of Gdansk, Poland ; Wyszynski, A. ; Schaumann, R.

A circuit technique for realizing voltage-tunable linear high-frequency CMOS transconductor cells that use two cross-coupled MOS or CMOS transistor pairs operating at saturation is described. The tuning capabilities attained with an adjustable CMOS voltage source are examined. Design trade-offs between linearity and bandwidth are discussed, and a simple operational transconductance amplifier (OTA) example is simulated via SPICE. The simulation results show that the transconductance can be varied by a factor of 8 and that, for a power supply of ±5 V, the linearity error is less than 0.5% for an input voltage of ±3.0 V. A cutoff frequency of over 370 MHz is obtained

Published in:

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:40 ,  Issue: 4 )

Date of Publication:

Apr 1993

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