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 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.

A Low-Frequency Filter in Inertial Applications

2015 ◽  
Vol 645-646 ◽  
pp. 875-880
Author(s):  
Qiang Li ◽  
Xiao Wei Liu ◽  
Liang Yin ◽  
Jia Jun Zhou
Keyword(s):  
Large Time ◽  
Cutoff Frequency ◽  
Low Frequency ◽  
Frequency Filter ◽  
Time Constants ◽  
Operational Transconductance Amplifiers ◽  
Technical Requirements ◽  
Low Pass ◽  
Transconductance Amplifiers ◽  
Current Shunt

A fourth-order cascade low-pass transconductance capacitor filter is designed, and the coefficients of the filter are calculated. For the implementation of large-time constants the current shunt technique and the current cancellation technique are employed in the operational transconductance amplifiers. The whole filter is simulated in Hspice, the the cutoff frequency is 150.2Hz and the THD of the filter is 65dB, which meet the technical requirements of the inertial applications.

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 Digitally Programmable Active-R Function Generator

1994 ◽  
Vol 17 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Muhammad Taher Abuelma'Atti
Keyword(s):  
Operational Amplifiers ◽  
Function Generator ◽  
Operational Transconductance Amplifiers ◽  
Digital Input ◽  
Generator Circuit ◽  
Digitally Programmable ◽  
Transconductance Amplifiers

A new digitally programmable active-R function generator circuit is presented. The circuit uses four operational amplifiers, two operational transconductance amplifiers, and resistors. The circuit can provide sinusoidal, square, and triangular waves with digitally programmable frequency. The frequency is linearly proportional With the digital input.

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.

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 Active-Only Sinusoidal Oscillator Circuits

2001 ◽  
Vol 24 (4) ◽  
pp. 223-232 ◽  
Author(s):  
Muhammad Taher Abuelmaatti ◽  
Muhammad Ali Al-Qahtani
Keyword(s):  
Operational Amplifier ◽  
Current Control ◽  
Current Feedback ◽  
Operational Transconductance Amplifiers ◽  
Sinusoidal Oscillator ◽  
Condition Of Oscillation ◽  
Transconductance Amplifiers ◽  
Current Feedback Operational Amplifier ◽  
Oscillator Circuits

Two new active-only sinusoidal oscillator circuits are proposed. The first circuit uses one current feedback operational amplifier (CFOA) and four operational transconductance amplifiers (OTAs). The second circuit uses only four OTAs. Without using any external passive elements, voltage (or current) control of the frequency and condition of oscillation, of the two circuits, can be achieved by adjusting the bias currents of the OTAs. The proposed circuits enjoy low sensitivities.

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