Simple Current-Mode Square-Rooting Circuit with Temperature Compensation Using Only OTAs

2010 ◽  
Vol 47 (1) ◽  
pp. 23-30
Author(s):  
Worapong Tangsrirat ◽  
Danucha Prasertsom ◽  
Tattaya Pukkalanun ◽  
Wanlop Surakampontorn
Keyword(s):  
Theoretical Analysis ◽  
Temperature Compensation ◽  
Current Mode ◽  
Experimental Results ◽  
Current Gain ◽  
Operational Transconductance Amplifiers ◽  
Active Elements ◽  
Transconductance Amplifiers ◽  
Circuit Technique ◽  
Tuning Property

A simple current-controlled current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifiers (OTAs) as active elements is proposed. It has been designed by using only four OTAs, without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tuning property of the OTA. Simulation and experimental results are obtained to verify the theoretical analysis of the proposed circuit technique.

Synthesis and Analysis of Electronically Adjustable Fractional-Order Low-Pass Filter

2017 ◽  
Vol 27 (02) ◽  
pp. 1850032 ◽  
Author(s):  
Jan Dvorak ◽  
Lukas Langhammer ◽  
Jan Jerabek ◽  
Jaroslav Koton ◽  
Roman Sotner ◽  
...  
Keyword(s):  
Current Mode ◽  
Experimental Results ◽  
Current Gain ◽  
Behavioral Models ◽  
Output Current ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Active Elements ◽  
Current Follower ◽  
Low Pass

A proposal of a fractional ([Formula: see text])-order low-pass filter is presented in this paper. The proposed filter operates in the current-mode and it is designed using Multi-Output Current Followers (MO-CFs), Dual-Output Current Follower (DO-CF), Dual-Output Adjustable Current Amplifier (DO-ACA) and Adjustable Current Amplifiers (ACAs) as active elements within the presented topology of the filter. The filter possesses ability to electronically control its order and also the pole frequency by changing the current gain of current amplifiers (ACAs) already present in the structure. Three different values of the order and pole frequency of the proposed low-pass filter were tested as an example. Design of the proposed filter is supported by simulation and experimental results. Simulations of the circuit are carried out in PSPICE simulator with behavioral models of used active elements. The experimental laboratory measurements are performed with the help of available devices forming equivalent circuits. Simulations and experimental results of the electronical control of the order and pole frequency are compared in this contribution.

scholarly journals Current-Mode Third-Order Quadrature Oscillator Using CDTAs

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Jiun-Wei Horng
Keyword(s):  
Theoretical Analysis ◽  
Phase Difference ◽  
Oscillation Frequency ◽  
Current Mode ◽  
Third Order ◽  
Quadrature Oscillator ◽  
Oscillation Condition ◽  
Transconductance Amplifiers ◽  
Simulation Results ◽  
A Current

This paper describes a current-mode third-order quadrature oscillator based on current differencing transconductance amplifiers (CDTAs). Outputs of two current-mode sinusoids with90°phase difference are available in the quadrature oscillator circuit. The oscillation condition and oscillation frequency are orthogonal controllable. The proposed circuit employs only grounded capacitors and is ideal for integration. Simulation results are included to confirm the theoretical analysis.

scholarly journals Advanced Readout System IC Current Mode Semi-Gaussian Shapers Using CCIIs and OTAs

VLSI Design ◽  
2007 ◽  
Vol 2007 ◽  
pp. 1-12 ◽  
Author(s):  
Thomas Noulis ◽  
Constantinos Deradonis ◽  
Stylianos Siskos
Keyword(s):  
Selection Criteria ◽  
Dynamic Range ◽  
Filter Design ◽  
Harmonic Distortion ◽  
Current Mode ◽  
Current Conveyors ◽  
Readout System ◽  
Fully Integrated ◽  
Operational Transconductance Amplifiers ◽  
Transconductance Amplifiers

Novel CMOS current mode shapers for front-end electronics are proposed. In particular, six semi-Gaussian shaper implementations based on second generation current conveyors and operational transconductance amplifiers are designed using advanced filter design techniques. Although all shaper architectures are fully integrated, they satisfy a relatively large peaking time. The topologies are analytically compared in terms of noise performance, power consumption, total harmonic distortion (THD), and dynamic range (DR) in order to examine which is the most preferable in readout applications. Design technique selection criteria are proposed in relation to the shaper structures performance. Analysis is supported by simulations results using SPICE in a 0.6 μm process by Austria Mikro Systeme (AMS).

scholarly journals New Minimum-Component OTA-Based Sinusoidal Oscillators

1996 ◽  
Vol 19 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Muhammad Haroon Khan
Keyword(s):  
Experimental Results ◽  
Passive Element ◽  
Operational Transconductance Amplifiers ◽  
Sinusoidal Oscillators ◽  
Transconductance Amplifiers ◽  
Oscillator Circuits

Using a general oscillator structure, new oscillator circuits are systematically derived. These oscillator circuits use two operational transconductance amplifiers (OTAs) and one externally connected passive element, exploiting the inherent zeros of the OTAs to advantage. The feasibility of obtaining oscillation using only two OTAs without externally connected passive elements is investigated. Experimental results are included.

scholarly journals Digitally Programmable Integrator and Differentiator

1995 ◽  
Vol 17 (4) ◽  
pp. 261-268
Author(s):  
Abdulrahman Khalaf Al-Ali ◽  
Muhammad Taher Abuelma'atti ◽  
Syed Yunus
Keyword(s):  
Operational Amplifier ◽  
Experimental Results ◽  
Time Constants ◽  
Operational Transconductance Amplifiers ◽  
Digitally Programmable ◽  
Transconductance Amplifiers

Digitally programmable integrator and differentiator circuits are presented. Each circuit uses at most one operational amplifier, two operational transconductance amplifiers, and one capacitor. The time constants of the circuits are decided by the biasing currents of the operational transconductance amplifiers. The circuits can be easily interfaced with microprocessor-based systems. Experimental results are included.

scholarly journals An OTA-Based Digital-To-Analog Converter

1994 ◽  
Vol 16 (3-4) ◽  
pp. 141-143
Author(s):  
A. R. Al-Ali ◽  
M. T. Abuelma'atti ◽  
A. Shabra
Keyword(s):  
Experimental Results ◽  
Binary Form ◽  
Simple Circuit ◽  
Digital To Analog Converter ◽  
Operational Transconductance Amplifiers ◽  
Current Switching ◽  
Analog Converter ◽  
Transconductance Amplifiers ◽  
Digital To Analog ◽  
A Current

A simple circuit for implementing a current-switching digital-to-analog converter is presented. The circuit uses operational transconductance amplifiers (OTAs) for switching a number of equal-value current sources. An R-2R ladder attenuator is used to scale the currents in a binary form. Experimental results show good performance.

scholarly journals New Temperature-Insensitive Electronically-Tunable Grounded Capacitor Simulator

1996 ◽  
Vol 19 (1) ◽  
pp. 55-58
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Muhammad Haroon Khan
Keyword(s):  
Experimental Results ◽  
Operational Transconductance Amplifiers ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

A new circuit for simulating a grounded capacitor is presented. The circuit uses one operationalamplifier (OA), three operational-transconductance amplifiers (OTAs), and one capacitor. The realized capacitor is temperature-insensitive and electronically tunable. Experimental results are included.

scholarly journals New Electronically-Tunable Oscillator Circuit Using Only Two OTAs

1998 ◽  
Vol 20 (4) ◽  
pp. 189-194 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Muhammad Haroon Khan
Keyword(s):  
Experimental Results ◽  
Independent Control ◽  
Oscillator Circuit ◽  
Operational Transconductance Amplifiers ◽  
Condition Of Oscillation ◽  
Transconductance Amplifiers ◽  
Electronically Tunable ◽  
Tunable Oscillator

New oscillator circuit using two operational transconductance amplifiers and grounded capacitors is presented. The oscillator circuit enjoys independent control of the frequency and the condition of oscillation. Experimental results confirming the presented theory are included.

scholarly journals Reconfigurable of current-mode differentiator and integrator based-on current conveyor transconductance amplifiers

2022 ◽  
Vol 12 (1) ◽  
pp. 208
Author(s):  
Soontorn Srisoontorn ◽  
Angkana Charoenmee ◽  
Suphaphorn Panikhom ◽  
Thitiporn Janda ◽  
Suttipong Fungdetch ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Direct Current ◽  
Current Mode ◽  
Current Conveyor ◽  
Universal Filter ◽  
Input And Output ◽  
Dc Bias ◽  
Transconductance Amplifiers ◽  
Additional Current

The reconfigurable of the differentiator and integrator based on current conveyor transconductance amplifiers (CCTAs) have been presented in this paper. The proposed configurations are provided with two CCTAs and grounded elements. The configurations can be operated in the differentiator and integrator by selecting external passive elements. The input and output currents have low and high impedances, respectively; therefore, the configurations can be cascaded without additional current buffer. The proposed configurations can be electronically tuned by external direct current (DC) bias currents, and it also has slight fluctuation with temperature. An application of universal filter is demonstrated to confirm the ability of the proposed configurations. The results of simulation with Pspice program are accordance with the theoretical analysis.

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