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-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 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 Voltage-Mode Multifunction Biquad Filter and Its Application as Fully-Uncoupled Quadrature Oscillator Based on Current-Feedback Operational Amplifiers

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6681
Author(s):  
San-Fu Wang ◽  
Hua-Pin Chen ◽  
Yitsen Ku ◽  
Ming-Xiu Zhong
Keyword(s):  
Oscillation Frequency ◽  
Transfer Functions ◽  
Amplitude Ratio ◽  
Experimental Results ◽  
Control Factor ◽  
Current Feedback ◽  
Quadrature Oscillator ◽  
Voltage Mode ◽  
Biquad Filter ◽  
Oscillation Condition

This research introduces a new multifunction biquad filter based on voltage mode (VM) current-feedback operational amplifier (CFOA) and a fully uncoupled quadrature oscillator (QO) based on the proposed VM multifunction biquad filter. The proposed VM multifunction biquad filter has high impedance to the input voltage signal, and uses three CFOAs as active components, while using four resistors and two grounded capacitors as passive components. The VM CFOA-based multifunction biquad filter realizes band-reject, band-pass, and low-pass transfer functions at high-input impedance node simultaneously, which has the feature of easy cascading in VM operation without the need for additional voltage buffers. Additionally, the filter control factor parameter pole frequency (ωo) and quality factor (Q) of the proposed VM multifunction biquad filter can be independently set by varying different resistors. By slightly modifying the VM multifunction biquad filter topology, a VM fully-uncoupled QO is easily obtained. The difference from the previous VM CFOA-based multifunction biquad filter is that the proposed VM CFOA-based multifunction biquad filter can be independently controlled by the filter control factor parameters, ωo and Q. The proposed VM CFOA-based multifunction biquad filter can be transformed into a VM QO with fully-uncoupled adjustable of the oscillation condition and the oscillation frequency. The oscillation condition and the oscillation frequency can be fully-uncoupled and controlled by varying two sets of completely different resistors. The proposed VM fully-uncoupled QO solves the amplitude instability. The constant amplitude ratio of two quadrature sinusoidal waveforms can be realized when tuning FO. PSpice simulation and experimental results prove the performances of the proposed VM multifunction filter and VM fully-uncoupled QO. Simulation and experimental results confirm the theoretical analysis of the proposed circuits.

A New CCII Based Voltage-Mode Multifunctional Filter with Reduced Number of Active and Passive Elements

2015 ◽  
Vol 24 (04) ◽  
pp. 1550047 ◽  
Author(s):  
Firat Yucel ◽  
Erkan Yuce
Keyword(s):  
Time Domain ◽  
Input Impedance ◽  
Current Conveyors ◽  
High Input ◽  
High Input Impedance ◽  
Voltage Mode ◽  
Low Pass ◽  
Band Pass ◽  
Simulation Results ◽  
High Pass

In this paper, a new voltage-mode (VM) multifunctional filter comprising two second-generation current conveyors (CCIIs) is proposed. The proposed filter with one input and three outputs is also composed of three resistors and two grounded capacitors. The proposed filter has high input impedance; thus, it can be easily connected with other VM circuits. The proposed filter can simultaneously provide low-pass (LP), band-pass (BP) and high-pass (HP) responses. A number of time domain and frequency domain simulation results are included to confirm the claimed theory.

NOVEL VOLTAGE-MODE CASCADABLE ALL-PASS SECTIONS EMPLOYING GROUNDED PASSIVE COMPONENTS

2013 ◽  
Vol 22 (01) ◽  
pp. 1250065 ◽  
Author(s):  
SUDHANSHU MAHESHWARI ◽  
JITENDRA MOHAN ◽  
DURG SINGH CHAUHAN
Keyword(s):  
Current Conveyors ◽  
Output Impedance ◽  
High Input ◽  
Passive Components ◽  
Quadrature Oscillator ◽  
Pspice Simulations ◽  
First Order ◽  
Voltage Mode ◽  
Differential Voltage ◽  
Parasitic Effects

This paper presents two new first-order voltage-mode (VM) cascadable all-pass (AP) sections, employing two differential voltage current conveyors (DVCCs) and three grounded passive components. Both circuits possess high input and low output impedance, which makes them easily cascadable. Non-ideality aspects and parasitic effects are also studied. As an application, a quadrature oscillator is designed using the proposed circuit. The proposed circuits are verified through PSPICE simulations using 0.5 μm CMOS parameters.

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.

scholarly journals Voltage Mode Pulse Width Modulator Using Single Operational Transresistance Amplifier

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Rajeshwari Pandey ◽  
Neeta Pandey ◽  
Sajal K. Paul
Keyword(s):  
Theoretical Analysis ◽  
Pulse Width ◽  
Relaxation Oscillator ◽  
Experimental Results ◽  
Voltage Mode ◽  
Pspice Simulation ◽  
Operational Transresistance Amplifier ◽  
Pulse Width Modulator ◽  
Simulation Results ◽  
Oscillator Output

This paper presents a voltage mode pulse width modulator (PWM) using single operational transresistance amplifier (OTRA). The proposed PWM consists of a relaxation oscillator output which is modulated using modulating signal. PSPICE simulation results and experimental results have been included to verify the theoretical analysis.

BODE-TYPE EQUALIZERS USING CURRENT CONVEYORS

2009 ◽  
Vol 18 (03) ◽  
pp. 433-442 ◽  
Author(s):  
AHMED M. SOLIMAN
Keyword(s):  
Operational Amplifier ◽  
Current Mode ◽  
Current Conveyors ◽  
Spice Simulation ◽  
Voltage Mode ◽  
Type Variable ◽  
Simulation Results

New voltage mode and current mode active RC Bode-type variable equalizers using current conveyors are introduced. The proposed equalizers can operate at much higher frequencies than the classical operational amplifier-based variable equalizers. Spice simulation results are included to confirm the practicality of the proposed circuits.

New Voltage-Mode Sinusoidal Oscillators Using VDIBAs

2019 ◽  
Vol 29 (04) ◽  
pp. 2050052
Author(s):  
San-Fu Wang ◽  
Hua-Pin Chen
Keyword(s):  
Theoretical Analysis ◽  
Bias Current ◽  
Electronic Control ◽  
Active Components ◽  
Passive Components ◽  
Voltage Mode ◽  
Sinusoidal Oscillators ◽  
Oscillation Condition ◽  
Condition Of Oscillation ◽  
Minimum Number

This paper presents two new voltage-mode sinusoidal oscillators based on voltage differencing inverting buffered amplifier (VDIBA). The first proposed circuit exhibits independent and electronic control of oscillation condition by using the bias current of the VDIBA. The proposed configuration contains only single VDIBA, two grounded capacitors and two resistors, which are the least number of active components and the minimum number of passive components necessary for realizing voltage-mode oscillator topology. The second proposed circuit exhibits independent and electronic control on the condition of oscillation without affecting the oscillation frequency by adjusting the separate bias currents of the VDIBAs. The proposed configuration contains two VDIBAs, two grounded capacitors and one resistor, which can provide four quadrature voltage outputs simultaneously. Both proposed circuits enjoy only two grounded capacitors, which are suitable for monolithic integration. HSpice simulations and experimental results are included to confirm the theoretical analysis.

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