Design Of Low Transconductance (GM) Ota For Active Filters In Bio-Medical Devices
In recent years, there has been considerable research efforts in the development of integrated Operational
Transconductance Amplifiers (OTAs) with small transconductances and improved linear range devoted for implementing
active filters, with low cut-off frequencies in bio-medical devices. A family of CMOS OTAs have been designed for very
small Gm, with the MOSFETs operating at weak inversion region. An OTA structure with a Bulk-driven Current division
Source Degeneration technique to achieve a small Gm has been discussed in this paper. A detailed comparison is made
among different schemes of implementation of OTA, in terms of its transconductance, device parameters and bias currents.
Keywords- OTA, Low Gm, Bulk-Driven, source degeneration, weak inversion, CDSD.