Extension of recently proposed two-CFOA-GC all pass filters to the realisation of first order universal active filters

Recently, six new all pass filter (APF) configurations, each employing two current feedback operational amplifiers (CFOA) and a grounded capacitor, were presented. This communication extends the utility of the earlier configurations by demonstrating that by some simple alterations of the various con...

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Bibliographic Details
Published in:International journal of electronics and communications 2022-03, Vol.146, p.154119, Article 154119
Main Authors: Raj, Ajishek, Bhaskar, Data Ram, Senani, Raj, Kumar, Pragati
Format: Article
Language:English
Subjects:
All pass filter
Current feedback operational amplifier
Equalizer
High pass filter
Low pass filter
Multiphase oscillator
Phase shifter
Quadrature oscillator
Universal filter
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Summary:Recently, six new all pass filter (APF) configurations, each employing two current feedback operational amplifiers (CFOA) and a grounded capacitor, were presented. This communication extends the utility of the earlier configurations by demonstrating that by some simple alterations of the various connections, all of them can be extended to yield first order universal active filter (UAF) configurations capable of realising all the three first order filters, namely, low pass, high pass and all pass without using any additional components. All the presented filter configurations possess high input impedance and low output impedance to facilitate easy cascading and also offer the tunability of the cut-off frequency/pole frequency and gain. Experimental results employing off-the-shelf AD844-type IC CFOAs have been included which validate the theoretical formulations.
ISSN:1434-8411
1618-0399
DOI:10.1016/j.aeue.2022.154119