An improved Q-tuning scheme and a fully symmetric OTA Conference Paper uri icon


  • An improved tuning scheme for continuous-time high-Q biquad filters is proposed. An improvement over the existing implementation of the modified-LMS Q-tuning scheme is combined with frequency tuning using PLL. The scheme has less area overhead, consumes lesser power and is more robust to offsets in the building blocks without compromising the accuracy achieved previously. A new architecture for a pseudo-differential fully-symmetric high frequency transconductor is also proposed. It combines CMFF and CMFB to achieve a faster common mode response. A bandpass filter with center frequency 100 MHz and Q of 20 is built using the proposed OTA. The proposed tuning scheme is used to tune the filter. The circuit is fabricated in standard CMOS 0.5u technology and the experimental results show that the Q tuning error is around 1%.

name of conference

  • 2002 IEEE International Symposium on Circuits and Systems

published proceedings

  • 2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353)

author list (cited authors)

  • Kallam, P., Sanchez-Sinencio, E., & Karsilayan, A. I.

citation count

  • 1

complete list of authors

  • Kallam, P||Sanchez-Sinencio, E||Karsilayan, AI

publication date

  • January 2002