scholarly journals Electronically Adjustable Emulator of the Fractional-Order Capacitor

2019 ◽  
Vol 25 (6) ◽  
pp. 28-34 ◽  
Author(s):  
Jan Dvorak ◽  
David Kubanek ◽  
Norbert Herencsar ◽  
Aslihan Kartci ◽  
Panagiotis Bertsias
Keyword(s):  
Fractional Order ◽  
Frequency Band ◽  
Filter Design ◽  
Current Conveyor ◽  
Electronic Control ◽  
Operational Transconductance Amplifier ◽  
Tunable Capacitors ◽  
Transconductance Amplifier ◽  
Electronically Tunable ◽  
Electronically Controllable

This paper presents a design of the controllable emulator of the FOC (Fractional-Order Capacitor) and its application. The circuit is based on 5th-order RC topology (type Foster I), where the passive elements in the topology are replaced by electronically adjustable components. The proposed emulator is based on OTA (Operational Transconductance Amplifier) and VDCC (Voltage Differencing Current Conveyor). The electronically controllable resistors are implemented by OTAs. The electronically tunable capacitors are implemented using capacitance multipliers, which employ VDCCs. The proposed structure provides the electronic control of the order and electronic shifting of the frequency band of the approximation validity. The proposed FOC emulator is also used for fractional-order filter design. The proposed circuits are verified using PSpice simulations.

Operational Transconductance Amplifier-Based Electronically Controllable Memcapacitor and Meminductor Emulators

2021 ◽  
pp. 2150222
Author(s):  
Eyyup demir ◽  
Abdullah Yesil ◽  
Yunus Babacan ◽  
Tevhit Karacali
Keyword(s):  
Process Parameters ◽  
High Order ◽  
Crucial Importance ◽  
Operational Transconductance Amplifier ◽  
Passive Components ◽  
Mos Transistor ◽  
Transconductance Amplifier ◽  
Simulation Results ◽  
Layout Area ◽  
Electronically Controllable

In this paper, two simple circuits are presented to emulate both memcapacitor and meminductor circuit elements. The emulation of these components has crucial importance since obtaining these high-order elements from markets is difficult when compared to resistor, capacitor and inductor. For this reason, we proposed Multi-Output Operational Transconductance Amplifier (MO-OTA)-based electronically controllable memcapacitor and meminductor circuits. To operate the MOS transistor as a capacitor, drain and source terminals are connected to each other. The memcapacitor behavior is obtained by driving the connected terminals with suitable voltage values. Only a few active and grounded passive components which are found in markets easily are used to emulate meminductive behavior. Furthermore, all passive elements in the circuit are grounded. All simulation results for memcapacitor and meminductor emulators are obtained successfully when compared to previous studies. For all analyses, MO-OTA is laid using the Cadence Spectre Analog Environment with TSMC 0.18[Formula: see text][Formula: see text]m process parameters and occupied a layout area of only 86.21[Formula: see text][Formula: see text]m.

scholarly journals Novel Reconnection-Less Reconfigurable Filter Design Based on Unknown Nodal Voltages Method and Its Fractional-Order Counterpart

2019 ◽  
Vol 25 (3) ◽  
pp. 34-38
Author(s):  
Lukas Langhammer ◽  
Roman Sotner ◽  
Jan Dvorak ◽  
Jan Jerabek ◽  
Peter A. Ushakov
Keyword(s):  
Fractional Order ◽  
Filter Design ◽  
Variable Gain Amplifier ◽  
Pass Band ◽  
Direct Transfer ◽  
Electronic Control ◽  
Operational Transconductance Amplifiers ◽  
Variable Gain ◽  
Transconductance Amplifiers ◽  
High Pass

A novel solution of reconnection-less electronically reconfigurable filter is introduced in the paper. The filter is designed based on unknown nodal voltages method (MUNV) using operational transconductance amplifiers (OTAs) and variable gain amplifier (VGA). The structure can provide all-pass, band-stop, high-pass 2nd order functions, high-pass function of the 1st order and direct transfer from the same topology without requirement of manual reconnection. The proposed structure also offers the electronic control of the pole frequency. Moreover, fractional-order design of the proposed filter is also provided. The behaviour is verified by simulations using Cadence IC6 (spectre) software.

ON THE TRANSFORMATION OF GROUNDED INDUCTORS TO FLOATING INDUCTORS USING OFA AND FCCII

2011 ◽  
Vol 20 (02) ◽  
pp. 243-262 ◽  
Author(s):  
AHMED M. SOLIMAN
Keyword(s):  
Operational Amplifier ◽  
Current Conveyor ◽  
Operational Transconductance Amplifier ◽  
Transconductance Amplifier ◽  
Simulation Results

It is well known that a floating inductor circuit is realized from a grounded inductor circuit by replacing the operational amplifier by a floating operational transconductance amplifier. This idea is extended to transform current conveyor grounded inductors to floating inductors by replacing the current conveyor by the recently introduced floating current conveyor. Several examples are considered and simulation results are given to support the theory. Although the paper is partially a review in nature it includes several new realizations of floating inductors.

An Electronically Adjustable Waveform Generator

2020 ◽  
Vol 29 (12) ◽  
pp. 2050191
Author(s):  
İbrahim Ethem Saçu
Keyword(s):  
Integrated Circuit ◽  
Passive Component ◽  
Waveform Generator ◽  
Active Devices ◽  
Generator Circuit ◽  
Transconductance Amplifier ◽  
Integrated Circuit Fabrication ◽  
Circuit Fabrication ◽  
Electronically Tunable ◽  
Electronically Controllable

A novel electronically adjustable square/triangular waveform generator has been introduced in this paper. The proposed circuit employs one active element, the multi-output current-controlled current conveyor transconductance amplifier, and one passive component grounded capacitor only. The resistorless realization of the presented generator provides a good advantage in terms of integrated circuit fabrication. In the offered circuit, the frequency and amplitude of the output square wave are electronically tunable by means of relevant bias currents. Additionally, the upper and lower threshold levels are electronically controllable by the respective bias current. On the contrary, electronically adjusting of the duty cycle of output waveform is possible via the external DC current. The generator circuit is simulated with TSMC 0.18[Formula: see text][Formula: see text]m technology parameters and SPICE. Moreover, the introduced circuit is implemented by using commercially available active devices and thus it is also verified experimentally.

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