Emulation of current excited fractional-order capacitors and inductors using OTA topologies

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• 作者：Georgia Tsirimokou^a ; ^{tsirimg@upatras.gr" class="auth_mail" title="E-mail the corresponding author} ; Costas Psychalinos^a ; ^{cpsychal@physics.upatras.gr" class="auth_mail" title="E-mail the corresponding author} ; Todd J. Freeborn^b ; ^{tjfreeborn1@eng.ua.edu" class="auth_mail" title="E-mail the corresponding author} ; Ahmed S. Elwakil^c ; ^d ; ^{elwakil@ieee.org" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Fractional-order capacitor ; Fractional-order inductor ; Analog signal processing circuits ; MOS integrated circuits ; Fractional-order circuits
• 刊名：Microelectronics Journal
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：55
• 期：Complete
• 页码：70-81
• 全文大小：3475 K

文摘

A novel topology suitable for emulating fractional-order capacitors and inductors using current excitation is achieved using a fractional-order differentiator/integrator block and appropriately configured Operational Transconductance Amplifiers. The scheme is capable of emulating both fractional-order capacitors and fractional-order inductors without any modifications to its structure. This implementation allows for electronic tuning of the order, capacitance/inductance, and bandwidth of operation by modification of only the bias current. Post-layout simulation results of the impedance magnitude and phase confirm the correct emulated behavior of both fractional-order capacitors and inductors. Two examples highlight the applications of this topology in i) realizing a fractional-order bandpass filter and ii) emulating a Cole-impedance model for biological applications. For both examples the characteristics of each circuit are validated in simulation.