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Design of a programmable OTA with multi-decade transconductance adjustment

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3 Author(s)
W. J. Adams ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; A. Nedungadi ; R. L. Geiger

A programmable operational transconductance amplifier (OTA) structure is presented which permits a gm adjustment by greater than two decades without severe degradation in linearity. This is achieved by including a programmable current mirror structure in the OTA output stage for coarse gm adjustment in addition to a fine gm adjustment via control of a bias current in the OTA differential input stage. Experimental results indicate that less than 1% nonlinearity in the transconductance characteristic is achieved throughout the gm adjustment range for input signals less than 1$iVpp

Published in:

Circuits and Systems, 1989., IEEE International Symposium on

Date of Conference:

8-11 May 1989