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 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 New Single-Resistor Controlled Sinusoidal Oscillator Circuit Using Unity-Gain Current Followers

1997 ◽  
Vol 20 (2) ◽  
pp. 105-109 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Hassan Al-Daghreer
Keyword(s):  
Experimental Results ◽  
Independent Control ◽  
Oscillator Circuit ◽  
Sinusoidal Oscillator ◽  
Current Follower ◽  
Condition Of Oscillation ◽  
Unity Gain

A new configuration for realizing current-follower-based sinusoidal oscillator is presented. The circuit uses two unity-gain current followers, three capacitors, and three resistors, and enjoys independent control of its frequency and condition of oscillation. Experimental results are included.

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.

An Emitter Follower Sinusoidal Oscillator Circuit

1995 ◽  
Vol 32 (3) ◽  
pp. 265-272
Author(s):  
Muhammad Taher Abuelma'atti
Keyword(s):  
Experimental Results ◽  
Oscillator Circuit ◽  
Emitter Follower ◽  
Sinusoidal Oscillator ◽  
Condition Of Oscillation

An emitter follower sinusoidal oscillator circuit An emitter-follower oscillator circuit is analysed. Expressions for the frequency of oscillation and the condition of oscillation are obtained. Experimental results which confirm the theory are presented.

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.

AN ELECTRONICALLY TUNABLE OSCILLATOR USING A SINGLE ACTIVE DEVICE AND TWO CAPACITORS

2008 ◽  
Vol 17 (05) ◽  
pp. 885-891 ◽  
Author(s):  
M. KOKSAL ◽  
M. SAGBAS ◽  
H. SEDEF
Keyword(s):  
Current Mode ◽  
Experimental Results ◽  
Current Mode Circuits ◽  
Active Device ◽  
Passive Components ◽  
Minimum Number ◽  
Electronically Tunable ◽  
A Current ◽  
Tunable Oscillator

A novel resistorless oscillator is presented. The proposed structure enjoys electronic tunability property with minimum number of active and passive components. This oscillator uses a current-mode (CM) active device and has properties of current mode circuits. The validity of the proposed circuit is verified by experimental results.

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 Electronically Tunable Third Order Filters and Dual Mode Sinusoidal Oscillator Using VDTAs and Grounded Capacitors

2021 ◽  
Vol 6 (4) ◽  
pp. 262-281
Author(s):  
Tapas Kumar Paul ◽  
Radha Raman Pal
Keyword(s):  
Integrated Circuits ◽  
Current Mode ◽  
Third Order ◽  
Sinusoidal Oscillator ◽  
Condition Of Oscillation ◽  
Low Pass ◽  
Component Matching ◽  
Band Pass ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

This study introduces a third order filter and a third order oscillator configuration. Both the circuits use two voltage difference transconductance amplifiers (VDTAs) and three grounded capacitors. By selecting the input and output terminals properly, current mode and transimpedance mode low-pass and band-pass filters can be obtained without component matching conditions. The natural frequency (ω0) can be tuned electronically. The oscillator circuit provides voltage and current outputs explicitly. The condition of oscillation (CO) and the frequency of oscillation (FO) can be adjusted orthogonally and electronically. The workability of the configurations is judged using TSMC CMOS 0.18 μm technology parameter as well as commercially available LM13700 integrated circuits (ICs). The simulation results show that: for ±0.9V power supply, the power consumption is 1.08 mW for both the configurations, while total harmonic distortions (THDs) are less than 2.06% and 2.17% for the filter and oscillator configurations, respectively.

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