scholarly journals Current-Mode Third-Order Quadrature Oscillator Using CDTAs

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Jiun-Wei Horng
Keyword(s):  
Theoretical Analysis ◽  
Phase Difference ◽  
Oscillation Frequency ◽  
Current Mode ◽  
Third Order ◽  
Quadrature Oscillator ◽  
Oscillation Condition ◽  
Transconductance Amplifiers ◽  
Simulation Results ◽  
A Current

This paper describes a current-mode third-order quadrature oscillator based on current differencing transconductance amplifiers (CDTAs). Outputs of two current-mode sinusoids with90°phase difference are available in the quadrature oscillator circuit. The oscillation condition and oscillation frequency are orthogonal controllable. The proposed circuit employs only grounded capacitors and is ideal for integration. Simulation results are included to confirm the theoretical analysis.

scholarly journals DDCC-Based Quadrature Oscillator with Grounded Capacitors and Resistors

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
Montree Kumngern ◽  
Kobchai Dejhan
Keyword(s):  
Theoretical Analysis ◽  
Oscillation Frequency ◽  
Current Conveyors ◽  
Quadrature Oscillator ◽  
Voltage Mode ◽  
Oscillation Condition ◽  
Simulation Results

A new voltage-mode quadrature oscillator using two differential difference current conveyors (DDCCs), two grounded capacitors, and three grounded resistors is presented. The proposed oscillator provides the following advantages: the oscillation condition and oscillation frequency are orthogonally controlled; the oscillation frequency is controlled through a single grounded resistor; the use of only grounded capacitors and resistors makes the proposed circuit ideal for IC implementation; low passive and active sensitivities. Simulation results verifying the theoretical analysis are also included.

scholarly journals Current-Controlled Current-Mode Quadrature Oscillator Using Translinear Current Conveyors

2019 ◽  
Vol 3 (1) ◽  
pp. 29
Author(s):  
Montree Kumngern
Keyword(s):  
Integrated Circuit ◽  
Second Generation ◽  
Current Mode ◽  
Current Conveyors ◽  
Circuit Implementation ◽  
Quadrature Oscillator ◽  
External Bias ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
A Current

In this paper, a current-mode quadrature oscillator using second-generation current conveyors (CCIIs) is presented. The proposed oscillator consists of two CCIIs, two grounded capacitors and two grounded resistors. The circuit is suitable for integrated circuit implementation by using grounded capacitors. In addition, a new current-controlled current-mode quadrature oscillator using two current controlled second generation current conveyors (CCCIIs) and two grounded capacitors can be obtained by replacing CCIIs and resistors series at X terminals with CCCIIs. The condition of oscillation and frequency of oscillation can be orthogonally controlled. The frequency of oscillation can be controlled by grounded resistors and external bias currents. The proposed circuits have been simulated by SPICE simulations. The simulation results are confirmed the proposed theory.

New Resistorless Third-Order Quadrature Sinusoidal Oscillators

2021 ◽  
pp. 2150194
Author(s):  
D. R. Bhaskar ◽  
Ajishek Raj ◽  
Pragati Kumar
Keyword(s):  
Oscillation Frequency ◽  
Frequency Stability ◽  
Good Frequency ◽  
Third Order ◽  
Operational Transconductance Amplifiers ◽  
Sinusoidal Oscillators ◽  
Sustained Oscillations ◽  
Oscillation Condition ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

This paper introduces four new resistorless, third-order, electronically tunable, quadrature sinusoidal oscillators using three operational transconductance amplifiers (OTAs) and three capacitors. The proposed third-order quadrature sinusoidal oscillators (TOQSOs) provide noninteracting control of the oscillation condition (OC) and oscillation frequency (OF) by changing the transconductance of different OTAs, to produce sustained oscillations and offer quadrature output voltages and currents. Two of the proposed quadrature oscillator circuits have capacitor control of OF, a feature, useful in capacitive transducers. The presented TOQSO structures have good frequency stability and exhibit low active and passive sensitivities. PSPICE simulations using CMOS OTAs along with hardware results (using off-the-shelf available OTA IC LM13700) have also been provided to confirm the workability of the presented circuits.

scholarly journals New Current-Mode Oscillators Using a Single Unity-Gain Current-Follower

1995 ◽  
Vol 18 (3) ◽  
pp. 151-157 ◽  
Author(s):  
Muhammad Taher Abuelma'atti
Keyword(s):  
Current Mode ◽  
Quadrature Oscillator ◽  
Current Follower ◽  
Unity Gain ◽  
Simulation Results

A general circuit for realizing current-mode oscillators using a single negative unity-gain current-follower is presented. Using this circuit new oscillators of this class can be discovered systematically. Simulation results obtained from three new circuits are presented. The feasibility of obtaining a quadrature oscillator is investigated.

scholarly journals Gm-Realization of Controlled-Gain Current Follower Transconductance Amplifier

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Worapong Tangsrirat
Keyword(s):  
Current Mode ◽  
Cmos Technology ◽  
Current Transfer ◽  
Biquad Filter ◽  
Transconductance Amplifier ◽  
Current Follower ◽  
Dc Bias ◽  
Simulation Results ◽  
Supply Voltages ◽  
A Current

This paper describes the conception of the current follower transconductance amplifier (CFTA) with electronically and linearly current tunable. The newly modified element is realized based on the use of transconductance cells (Gms) as core circuits. The advantage of this element is that the current transfer ratios (iz/ipandix/iz) can be tuned electronically and linearly by adjusting external DC bias currents. The circuit is designed and analyzed in 0.35 μm TSMC CMOS technology. Simulation results for the circuit with ±1.25 V supply voltages show that it consumes only 0.43 mw quiescent power with 70 MHz bandwidth. As an application example, a current-mode KHN biquad filter is designed and simulated.

scholarly journals Versatile Voltage-Mode Biquadratic Filter and Quadrature Oscillator Using Four OTAs and Two Grounded Capacitors

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1493
Author(s):  
San-Fu Wang ◽  
Hua-Pin Chen ◽  
Yitsen Ku ◽  
Chia-Ling Lee
Keyword(s):  
Integrated Circuit ◽  
Oscillation Frequency ◽  
Low Cost ◽  
Circuit Complexity ◽  
Low Noise ◽  
Active Components ◽  
Quadrature Oscillator ◽  
Voltage Mode ◽  
Biquad Filter ◽  
Oscillation Condition

This article presents a versatile voltage-mode (VM) biquad filter with independently electronic tunability. The proposed structure using one dual-output operational transconductance amplifier, three single-output operational transconductance amplifiers (OTAs) and two grounded capacitors was explored to derive a new VM quadrature oscillator with the independent control of the oscillation frequency and the oscillation condition. The proposed versatile VM biquad filter achieves nearly all of the main advantages: (i) simultaneous realizations of band-reject, band-pass, and low-pass from the same architecture, (ii) multiple-input and multiple-output functions, (iii) independent electronic adjustability of quality factor and resonant angular frequency, (iv) no resistor needed, (v) all input terminals with cascade functions, (vi) no additional inverting amplifier for input signals, (vii) using only grounded capacitors, and (viii) easy to implement a VM quadrature oscillator with independent electronically controlled oscillation frequency and oscillation condition. The proposed versatile VM biquad filter employs only four OTAs and two grounded capacitors. The active components of the proposed VM biquad filter are one less than that of recent reports. The proposed circuit also brings versatility and simplicity to the design of VM biquad filters and VM quadrature oscillators. Filters and oscillators with less active and passive components have the advantages of low cost, low power dissipation, low circuit complexity, and low noise. Commercially available integrated circuit LT1228 and discrete components can be used to implement the proposed OTA-based circuits. The simulation and experiment results validated the theoretical analysis.

scholarly journals A New Translinear-Based Dual-Output Square-Rooting Circuit

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Montree Kumngern ◽  
Kobchai Dejhan
Keyword(s):  
Temperature Stability ◽  
Current Mode ◽  
Input Current ◽  
Absolute Value ◽  
Current Mirrors ◽  
Input Range ◽  
Simulation Results ◽  
Simulator Program ◽  
Mode Technique ◽  
A Current

A new wide input range square-rooting circuit is presented. The proposed circuit consists of a dual translinear loop, an absolute value circuit, and current mirrors. A current-mode technique is used to provide wide input range with simple circuitry. The output signal of the proposed circuit is the current which is proportional to the square root of input current. The proposed square-rooting circuit was confirmed by using PSpice simulator program. The simulation results demonstrate that the proposed circuit provides the excellent temperature stability with wide input current range.

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