First-order allpass filter using multi-input OTA

Abstract

A novel first-order allpass filter, operating in voltage-mode, is introduced in this article. Compared with the corresponding already proposed structures, attractive offered benefits are the capability for simultaneous offering a minimum number of active and passive components, and the absence of any realisability restriction. These have been achieved by employing a multiple-input operational transconductance amplifier as active element. The performance of the proposed circuits has been evaluated through simulation results, utilising the Analog Design Environment of Cadence software.

Keywords:

• analogue integrated circuits
• analogue signal processing
• voltage-mode filters
• allpass filters
• operational transconductance amplifiers

Acknowledgements

The University Grants Commission, New Delhi, India, supported this research study under financial assistance, no. F. 6-1(31)/2007(MRP/Sc/NRCB), dated 24 February 2007. The authors would like to acknowledge assistance provided by UGC.