New two CFOA-based sinusoidal RC oscillators with buffered outlet

Abuelma’atti, Muhammad Taher

doi:10.1007/s10470-010-9582-5

Cited by 12 publications

(11 citation statements)

References 16 publications

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“…Some theoretical information about synthesis was given by Gupta et al in [54]. In [55], Abuelmaatti introduced novel oscillator solutions based on partial admittance autonomous networks with 1 and 2 CFAs and verified circuits employ 3 and 4 passive elements, respectively. Unfortunately, equations for FO and CO are quite complicated.…”

Section: Introductionmentioning

confidence: 99%

New Double Current Controlled CFA (DCC–CFA) Based Voltage–Mode Oscillator with Independent Electronic Control of Oscillation Condition and Frequency

Šotner¹,

Herencsár²,

Jeřábek³

et al. 2013

Journal of Electrical Engineering

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In this paper, a new electronically tunable quadrature oscillator (ETQO) based on two modified versions of current feedback amplifiers (CFAs), the so called double current controlled CFA (DCC-CFAs) is presented. The frequency of oscillation (FO) of the proposed voltage-mode (VM) ETQO is electronically adjustable by current gain or by varying the intrinsic resistance of the X terminal of the active element used. The condition of oscillation (CO) is adjustable by current gain independently with respect to frequency of oscillation. Simultaneous control of current gain and intrinsic resistance allows linear control of FO and provides extension of frequency tuning range. In the proposed circuit all the capacitors are grounded. The use of only grounded capacitors makes the proposed circuit ideal for integrated circuit implementation. The presented active element realized by using BiCMOS technology and the behavior of proposed circuit are discussed in details. The theoretical results are verified by SPICE simulations based on CMOS ON-Semi C5 0.5 µ m and bipolar ultra high frequency transistor arrays Intersil HFA 3096 process parameters.

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Section: Introductionmentioning

confidence: 99%

New Double Current Controlled CFA (DCC–CFA) Based Voltage–Mode Oscillator with Independent Electronic Control of Oscillation Condition and Frequency

Šotner¹,

Herencsár²,

Jeřábek³

et al. 2013

Journal of Electrical Engineering

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“…It is worth mentioning that the circuit is similar to the oscillator in Fig. 7 of [2] which employs a CFOA based NIC. The circuits have been verified through SPICE simulations using the MOSFET implementation of CCII in Fig.…”

Section: Corrected Circuitsmentioning

confidence: 99%

Current-mode variable frequency quadrature sinusoidal oscillators using two CCs and four passive components including grounded capacitors: a supplement

Lahiri

2011

Analog Integr Circ Sig Process

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This letter comments on the recently published paper in [1] which provides realizations of minimum component quadrature sinusoidal oscillators. On re-examination of the 'Type 3' oscillator circuits in [1], it has been found that the circuits actually suffer from 'latch up' problem due to use of incorrect polarity of the CCII based negative-impedance convertor. This problem has been corrected (without altering the characteristic equation) by swapping the impedances at y and x terminals. Explicit quadrature current outputs are derived similarly as done in [1].

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“…Especially in modulation system, the quadrature oscillator is used to generate the carrier signal for quadrature amplitude modulation (QAM) and single-sideband modulation (SSB) [1,2]. Most of sinusoidal oscillator designs required the following features: low THD of the quadrature sinusoidal output, independent control of frequency of oscillation (FO) and condition of oscillation (CO) [3], using minimum number of active and passive element [4], electronic controllability [5] and so on.…”

Section: Introductionmentioning

confidence: 99%

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

Satipar¹,

Intani²,

Jaikla

2017

Journal of Electrical and Computer Engineering

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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.

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New two CFOA-based sinusoidal RC oscillators with buffered outlet

Cited by 12 publications

References 16 publications

New Double Current Controlled CFA (DCC–CFA) Based Voltage–Mode Oscillator with Independent Electronic Control of Oscillation Condition and Frequency

New Double Current Controlled CFA (DCC–CFA) Based Voltage–Mode Oscillator with Independent Electronic Control of Oscillation Condition and Frequency

Current-mode variable frequency quadrature sinusoidal oscillators using two CCs and four passive components including grounded capacitors: a supplement

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

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