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Temperature compensation of Gm-C filters using resistive bridge

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3 Author(s)
Moradi, A. ; Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, QC, Canada ; Raut, R. ; Cowan, G.E.R.

A new technique for temperature compensation of Gm-C filters is presented. Using negative feedback the Gm-cells' transconductance is locked to the reciprocal of a resistance array. Temperature dependency of the Gm/C ratio, which determines the unity-gain frequency, is minimised by arranging the temperature dependency of the resistors. Unique properties of a proposed resistive bridge allow for the synthesis of temperature coefficients beyond the range of coefficients of constituent elements. With a set of practical elements a variation of only 0.66% in Gm/C has been achieved over -40 to 120degC.

Published in:

Electronics Letters  (Volume:45 ,  Issue: 18 )