scholarly journals Operational transconductance amplifier macromodel optimization for active piezoelectric filter design

2013 ◽  
Vol 6 (12(66)) ◽  
pp. 30
Author(s):  
Andrii Zazerin ◽  
Anatolii Orlov ◽  
Oleksandr Bogdan
Keyword(s):  
Filter Design ◽  
Operational Transconductance Amplifier ◽  
Transconductance Amplifier

Bulk linearized CMOS differential pair transconductor for continuous-time OTA-C filter design

2014 ◽  
Vol 62 (1) ◽  
pp. 77-84 ◽  
Author(s):  
B. Pankiewicz ◽  
S. Szczepański ◽  
M. Wójcikowski
Keyword(s):  
Transfer Function ◽  
Analytical Solution ◽  
Input Signal ◽  
Continuous Time ◽  
Low Voltage ◽  
Filter Design ◽  
Current Transfer ◽  
Operational Transconductance Amplifier ◽  
Transconductance Amplifier ◽  
Differential Pair

Abstract In this paper, the MOS differential pair driven simultaneously from gates and bulk terminals is described. An approximated analytical solution of the voltage to current transfer function has been found for the proposed circuit. Four possible combinations of gate and bulk connections of the input signal are presented. Basing on the configuration giving the best linearity, the operational transconductance amplifier (OTA) has been designed and compared, by computer simulations, to the amplifier utilizing the gate driven classic MOS pair. 3rd order filters using the OTAs with linearized and simple MOS pair have been designed and the resulting parameters have been compared. Linearization through the presented simultaneous use of gate and bulk terminals seems to be useful for low voltage applications.

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.

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