New OTA-Based Sinusoidal Oscillators with Fully Uncoupled Control of Oscillation Frequency and Condition

Abuelma’atti, Muhammad Taher

doi:10.1515/freq.2001.55.7-8.224

Cited by 6 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore the QO play an important role in many communication systems, instrumentation systems and signal processing see [3][4][5][6][7][8][9][10][11]. Recently, a CMOS realization of VDTA and its applications as 1) RF filter and 2) double tuned amplifier have been presented in [12].…”

Section: Introductionmentioning

confidence: 99%

Electronically Controllable Fully-Uncoupled Explicit Current-Mode Quadrature Oscillator Using VDTAs and Grounded Capacitors

Prasad¹,

Srivastava²,

Bhaskar³

2013

View full text Add to dashboard Cite

An electronically controllable fully uncoupled explicit current-mode quadrature oscillator employing Voltage Differencing Transconductance Amplifiers (VDTAs) as active elements has been presented. The proposed configuration employs two VDTAs along with grounded capacitors and offers the following advantageous features 1) fully and electronically independent control of condition of oscillation (CO) and frequency of oscillation (FO); 2) explicit currentmode quadrature oscillations; and 3) low active and passive sensitivities. The workability of proposed configuration has been demonstrated by PSPICE simulations with TSMC CMOS 0.18 μm process parameters.

show abstract

Section: Introductionmentioning

confidence: 99%

Electronically Controllable Fully-Uncoupled Explicit Current-Mode Quadrature Oscillator Using VDTAs and Grounded Capacitors

Prasad¹,

Srivastava²,

Bhaskar³

2013

View full text Add to dashboard Cite

show abstract

“…Second example is quite interesting quadrature oscillator obtained by simple modification of the same SFG. Recently, many oscillator conceptions based on the current conveyors have been published, for example [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Some of these applications are not tunable [38, 41 and 42].…”

Section: Introductionmentioning

confidence: 99%

“…There have been published oscillator circuits with the conveyors CCII which are based on single active block and four or five passive elements [40,43,50]. Furthermore circuits with two active blocks and four or six passive elements [36, 38-39, 41, 44-46, 48] and at the most with three CCII and eight passive elements [34,35,38,42,47,49] have been published. The circuits mentioned above were mostly verified through simulations at low frequencies only (kHz) where the use of these high-speed blocks is not substantiated.…”

Section: Introductionmentioning

confidence: 99%

An Example of Easy Synthesis of Active Filter and Oscillator using Signal Flowgraph Modification and Controllable Current Conveyors

Šotner¹,

Hrubos²,

Sevcik³

et al. 2011

Journal of Electrical Engineering

View full text Add to dashboard Cite

The paper deals with synthesis of active frequency filters and oscillators for applications in the video band. The synthesis is based on the modified signal flow graph design approach in the current mode. The commercially available high frequency current conveyors and second order structures are used. Basic structure is employing loss-less and lossy current mode integrators in two distributed feedback loops. Some of the used active elements allow to control current gain which is very useful in applications. High frequency multi-functional filter and electronically adjustable quadrature oscillator configurations are discussed. Most of the used passive elements (mainly capacitors) are grounded which is suitable for IC implementation.Simulation and experimental results demonstrate function and features very well.

show abstract

“…A great variety of active oscillators has been developed for generating sine waves, most of them based on the use of conventional operational amplifiers [4], [5], operational transconductance amplifiers [13], and current conveyors [1], [9], [10]. The oscillation conditions must be satisfied to ensure that the pair of characteristic roots lies on the imaginary axis of the complex frequency plane.…”

Section: Introductionmentioning

confidence: 99%

An AGC Circuit Design for a Variable-Frequency Sinusoidal Oscillator with Wide Frequency Range and Low Distortion Level

Hou

2004

Circuits Syst Signal Process

View full text Add to dashboard Cite

An up-down counter, multiplier, digital-to-analog (D/A) converter, and highspeed comparators are employed to achieve an automatic gain control (AGC) circuit, which corrects the pair of characteristic roots of the overall system automatically to the imaginary axis of the complex frequency plane. A negative feedback technique with digital hardware is applied on the loop gain control. No lowpass filter is needed to detect the oscillation amplitude. Thus, this technique is suitable for sinusoidal oscillators with a wide oscillation frequency range. Wien-bridge and phase-shift oscillators with an oscillation frequency range from 17 Hz to 1 MHz are tested with the proposed AGC circuit. The total harmonic distortions of the Wien-bridge sinusoidal oscillator with the proposed AGC circuit are verified to be very small. An application to a variable-frequency sinusoidal oscillator is also described. The experimental results demonstrate the static characteristics and dynamic responses of the overall system.

show abstract

New OTA-Based Sinusoidal Oscillators with Fully Uncoupled Control of Oscillation Frequency and Condition

Cited by 6 publications

References 21 publications

Electronically Controllable Fully-Uncoupled Explicit Current-Mode Quadrature Oscillator Using VDTAs and Grounded Capacitors

Electronically Controllable Fully-Uncoupled Explicit Current-Mode Quadrature Oscillator Using VDTAs and Grounded Capacitors

An Example of Easy Synthesis of Active Filter and Oscillator using Signal Flowgraph Modification and Controllable Current Conveyors

An AGC Circuit Design for a Variable-Frequency Sinusoidal Oscillator with Wide Frequency Range and Low Distortion Level

Contact Info

Product

Resources

About