Synthesis for Butterworth Filter Using Compact VDTA Based on Sallen- Key Topology

Author(s): Yong-An Li*

Journal Name: Recent Advances in Electrical & Electronic Engineering
Formerly Recent Patents on Electrical & Electronic Engineering

Volume 13 , Issue 5 , 2020

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Graphical Abstract:


Background: The original filter including grounded or virtual ground capacitors can be synthesized by using the NAM expansion. However, so far the filters including floating capacitor, such as Sallen-Key filter, have not been synthesized by means of the NAM expansion. This is a problem to be researched further.

Methods: By using the adjoint network theory, the Sallen-Key filter including floating capacitor first is turned into a current-mode one, which includes a grounded capacitor and a virtual ground capacitor. Then the node admittance matrix, after derived, is extended by using NAM expansion.

Results: At last, one VDTA Sallen-Key filter is received. It employs single compact VDTA and two grounded capacitors.

Conclusion: A Butterworth VDTA second-order frequency filter based on Sallen-Key topology with fo = 100kHz, HLP = -HBP=1, is designed.

Keywords: Current-mode circuit, sallen-Key topology, Butterworth filter, VDTA, adjoint network theorem, nodal admittance matrix expansion.

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Article Details

Year: 2020
Published on: 21 September, 2020
Page: [681 - 688]
Pages: 8
DOI: 10.2174/2352096512666191004123213
Price: $25

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