A Fully Balanced Pseudo-Differential OTA With Common-Mode Feedforward and Inherent Common-Mode Feedback Detector Academic Article uri icon


  • 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 mVppat 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.

altmetric score

  • 3

author list (cited authors)

  • Mohieldin, A. N., Sánchez-Sinencio, E., & Silva-Martínez, J.

citation count

  • 97

publication date

  • April 2003