Trade-offs in the OTA-based analog filter design

Authors:
Bilgin Metin;Kirat Pal;Shahram Minaei;Oguzhan Cicekoglu
Affiliations:
Department of Management Information Systems, Bogazici University, Bebek-Istanbul, Turkey 34342;Department of Earthquake Engineering, Indian Institute of Technology, Roorkee, India 247667;Department of Electronics and Communications Engineering, Dogus University, Acibadem, Kadikoy, Turkey 34722;Department of Electrical and Electronic Engineering, Bogazici University, Bebek-Istanbul, Turkey 34342
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2009

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IMMURO'12 Proceedings of the 11th WSEAS international conference on Instrumentation, Measurement, Circuits and Systems, and Proceedings of the 12th WSEAS international conference on Robotics, Control and Manufacturing Technology, and Proceedings of the 12th WSEAS international conference on Multimedia Systems & Signal Processing

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Abstract

Operational transconductance amplifiers (OTAs) are widely used in the design of electronically tunable circuits. However, electronic tunability ranges of the OTA based filters are restricted by the limited bandwidth of the transconductance gain of the OTA. Furthermore, stability conditions and the linearity of the OTA which depends on the control current restrict the tunability. In this paper, some trade-offs in the electronically tunable filters are investigated. In addition, the tunability ranges of some first and second order OTA-C and OTA-RC filters are comparatively examined. Moreover, an OTA-C all-pass filter circuit is presented. SPICE simulations are performed and stability analyses are given for both of the OTA-C and OTA-RC filters. Operation of the presented all-pass filter is verified experimentally.