Current-mode operational transconductance amplifier-capacitor biquad filter structures based on Tarmy-Ghausi Active-RC filter and second-order digital all-pass filters

Kamath, D V and Ananda Mohan, P V and Prabhu, G K (2010) Current-mode operational transconductance amplifier-capacitor biquad filter structures based on Tarmy-Ghausi Active-RC filter and second-order digital all-pass filters. IET circuits devices and systems, 4 (4). pp. 346-364. ISSN 1751-858X

[img] PDF
05508703_IET_2010.PDF.pdf - Published Version
Restricted to Registered users only

Download (1MB) | Request a copy
Official URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arn...

Abstract

The Tarmy-Ghausi (TG) active resistor-capacitor (RC) filters using op-amps and its modification by Moschytz are well known to active RC filter designers. These use first-order all-pass networks in a negative feedback loop. New current-mode universal operational transconductance amplifier-capacitor (OTA-C) biquad filters based on the TG active RC filter are considered here. These are based on a recently proposed OTA-C based first-order all-pass network. Three different feedback arrangements are investigated in the proposed filter structure so as to reduce the pole-Q sensitivity. The proposed biquad filters are shown to implement all different types of filters like low-pass, high-pass, band-pass, symmetric notch, all-pass, low-pass notch and high-pass notch. The synthesis of the general biquad is carried out in a novel way by invoking the analogy with direct-form digital filter structures. The special case of all-pass filter realisation derived from the proposed universal filter needs additional hardware for realising the feed-forward coefficients. Hence alternative OTA-C based all-pass filter implementations based on Mitra-Hirano and Gray-Markel second-order digital filter structures are derived in which the coefficients that are used to realise the denominator are shared in the realisation of numerator also. All the proposed circuits are compared with the other structures available in the literature. The simulation results of the proposed circuits are also presented.

Item Type: Article
Subjects: Engineering > MIT Manipal > Biomedical
Engineering > MIT Manipal > Electronics and Communication
Depositing User: MIT Library
Date Deposited: 02 Jun 2011 06:03
Last Modified: 02 Apr 2014 06:00
URI: http://eprints.manipal.edu/id/eprint/116

Actions (login required)

View Item View Item