Active-RC filters using two-stage OTAs with and without feed-forward compensation

D. V. Kamat, P. V. Ananda Mohan, K. Gopalakrishna Prabhu

Research output: Contribution to journalArticlepeer-review

15 Citations (SciVal)


In this study, the design of active-RC filters using opamps with and without feed-forward-compensation is considered. Accurate analysis of the passive compensation scheme suggested in literature for lossless and lossy integrators using feed-forward-compensated opamps is carried out. The compensation for the lossy and lossless integrators using negative impedance converter for active filters using two cascaded gms in place of opamps is explored. Novel building blocks for realising the negative capacitance needed for exact compensation are proposed. To study the efficacy of the proposed compensation technique, a two-integrator loop biquad is considered. The PSPICE simulation results of Tow-Thomas biquad are presented to highlight the performance improvement obtained using the proposed compensation techniques.

Original languageEnglish
Pages (from-to)527-535
Number of pages9
JournalIET Circuits, Devices and Systems
Issue number6
Publication statusPublished - 11-2011

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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