On the design of low-frequency filters using CMOS OTAs operating in the subthreshold region

Duzenli G., Kilic Y., Kuntman H., Ataman A.

MICROELECTRONICS JOURNAL, cilt.30, sa.1, ss.45-54, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 30 Konu: 1
  • Basım Tarihi: 1999
  • Doi Numarası: 10.1016/s0026-2692(98)00084-6
  • Sayfa Sayıları: ss.45-54


Design considerations on a circuit technique based on subthreshold operation of MOS transistors is described for the realization of low-frequency OTA-C active filters with small capacitance values of the order of 25-400 pF. The circuit technique described is applied to the alpha (8-12 Hz), beta (13-40 Hz), theta (4-8 Hz) and delta (1-4 Hz) band filters for EEG signals. Because of small capacitance values the filter circuit is suitable for realization on a single VLSI chip using the CMOS technology, and enables the user to implement the circuit on implantable biotelemetric applications. (C) 1998 Elsevier Science Ltd. All rights reserved.