Multifunctional current-mode filter with dual-parameter control of the pole frequency

This paper presents a multifunctional current-mode filter with dual-parameter control of the pole frequency. The filter is of the second order, of single-input triple-output (SITO) type and a required type of the response (low pass, inverting band pass, high pass, band reject and all pass) is obtain...

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Bibliographic Details
Published in:Advances in electrical and computer engineering 2016-01, Vol.16 (3), p.31-36
Main Authors: JERABEK, J., DVORAK, J., SOTNER, R., METIN, B., VRBA, K.
Format: Article
Language:English
Subjects:
active filters
Adjustment
Amplification
Capacitors
circuit analysis
circuit synthesis
Current amplifiers
current-mode circuits
Gain
Low pass
Operational amplifiers
Poles
tunable circuits and devices
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Summary:This paper presents a multifunctional current-mode filter with dual-parameter control of the pole frequency. The filter is of the second order, of single-input triple-output (SITO) type and a required type of the response (low pass, inverting band pass, high pass, band reject and all pass) is obtained by proper selection of one or more outputs. The filter employs two capacitors, two operational transconductance amplifiers (OTAs), each of them with controllable transconductance, and two digitally adjustable current amplifiers (DACAs), providing controllable current gain. Both these controllable parameters directly influence pole frequency of the filter. The theoretical presumptions were confirmed by laboratory measurements.
ISSN:1582-7445
1844-7600
DOI:10.4316/AECE.2016.03005