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A fully balanced pseudo-differential OTA with common-mode feedforward and inherent common-mode feedback detector

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3 Author(s)
Mohieldin, A.N. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Sanchez-Sinencio, E. ; Silva-Martinez, J.

A pseudo-differential fully balanced fully symmetric CMOS operational transconductance amplifier (OTA) architecture with inherent common-mode detection is proposed. Through judicious arrangement, the common-mode feedback circuit can be economically implemented. The OTA achieves a third harmonic distortion of -43 dB for 900 mVpp at 30 MHz. The OTA, fabricated in 0.5-μm CMOS process, is used to design a 100-MHz fourth-order linear phase filter. The measured filter's group delay ripple is 3% for frequencies up to 100 MHz, and the measured dynamic range is 45 dB for a total harmonic distortion of -46 dB. The filter consumes 42.9 mW per complex pole pair while operating from a ±1.65-V power supply.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 4 )