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.

scholarly journals Active-Only Sinusoidal Oscillator with Electronically-Tunable Fully-Uncoupled Frequency and Condition of Oscillation

2001 ◽  
Vol 24 (4) ◽  
pp. 233-241 ◽  
Author(s):  
Muhammad Taher Abuelmaatti
Keyword(s):  
Second Generation ◽  
Operational Amplifiers ◽  
Current Conveyors ◽  
Oscillator Circuit ◽  
Operational Transconductance Amplifiers ◽  
Sinusoidal Oscillator ◽  
Condition Of Oscillation ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

A new active-only sinusoidal oscillator is presented. The oscillator circuit uses two internally compensated operational amplifiers, two plus-type second-generation current conveyors and three operational transconductance amplifiers. The proposed circuit enjoys the attractive features of totally uncoupled frequency and condition of oscillation, low sensitivities, electronic tunability and integratability.

scholarly journals Multi-Function Active-Only High-Order Current-Driven Filter

2000 ◽  
Vol 23 (3) ◽  
pp. 157-161
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Husain Abdullah Alzaher
Keyword(s):  
Output Voltage ◽  
High Order ◽  
Input Current ◽  
Operational Amplifiers ◽  
Output Current ◽  
Current Output ◽  
Circuit Topology ◽  
Operational Transconductance Amplifiers ◽  
Order Filter ◽  
Transconductance Amplifiers

A new multi-function high-order current-driven filter is proposed. The filter uses only operational amplifiers, and operational transconductance amplifiers (OTAs). Without using any external passive elements, a variety of high-order input-current/output-current and/or input-current/output-voltage responses can be realised without changing the circuit topology and without any matching or cancellation conditions. The parameters of the high-order filter responses can be electronically tuned by adjusting the bias currents of the OTAs.

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.

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