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 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 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.

scholarly journals Electronically Tunable Quadrature Sinusoidal Oscillator with Equal Output Amplitudes during Frequency Tuning Process

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Den Satipar ◽  
Pattana Intani ◽  
Winai Jaikla
Keyword(s):  
Frequency Tuning ◽  
Digital Circuit ◽  
Bias Current ◽  
Experimental Results ◽  
Current Conveyors ◽  
Active Device ◽  
Output Terminal ◽  
Sinusoidal Oscillator ◽  
Condition Of Oscillation ◽  
Electronically Tunable

A new configuration of voltage-mode quadrature sinusoidal oscillator is proposed. The proposed oscillator employs two voltage differencing current conveyors (VDCCs), two resistors, and two grounded capacitors. In this design, the use of multiple/dual output terminal active building block is not required. The tuning of frequency of oscillation (FO) can be done electronically by adjusting the bias current of active device without affecting condition of oscillation (CO). The electronic tuning can be done by controlling the bias current using a digital circuit. The amplitude of two sinusoidal outputs is equal when the frequency of oscillation is tuned. This makes the sinusoidal output voltages meet good total harmonic distortions (THD). Moreover, the proposed circuit can provide the sinusoidal output current with high impedance which is connected to external load or to another circuit without the use of buffer device. To confirm that the oscillator can generate the quadrature sinusoidal output signal, the experimental results using VDCC constructed from commercially available ICs are also included. The experimental results agree well with theoretical anticipation.

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.

Dual-Mode Quadrature Oscillator Using Current Follower Transconductance Amplifiers for GMI Sensors

2013 ◽  
Vol 712-715 ◽  
pp. 1886-1890
Author(s):  
Lei Zhang ◽  
Zhong Ming Pan
Keyword(s):  
Dual Mode ◽  
Transconductance Amplifier ◽  
Current Voltage ◽  
Sinusoidal Oscillator ◽  
Current Follower ◽  
Condition Of Oscillation ◽  
Transconductance Amplifiers ◽  
Passive Sensitivity ◽  
Quadrature Oscillators ◽  
Circuit Configuration

For designing GMI sensors, realization of current/voltage-mode (dual-mode) quadrature sinusoidal oscillator with the employment of current follower transconductance amplifier (CFTA) as the active component is presented. The proposed circuit configuration comprising two CFTAs, one grounded resistor and two grounded capacitors can simultaneously provide two explicit quadrature output currents and two quadrature output voltages. Moreover, the proposed circuit topology enjoys the advantage of independent control of the condition of oscillation and frequency of oscillation and good active and passive sensitivity performances. The functionality of the proposed quadrature oscillators has been verified by PSPICE simulations.

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 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 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.

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