NEW REALIZATIONS OF VOLTAGE-MODE QUADRATURE OSCILLATORS USING CURRENT DIFFERENCING BUFFERED AMPLIFIERS

2010 ◽  
Vol 19 (05) ◽  
pp. 1069-1076 ◽  
Author(s):  
ABHIRUP LAHIRI
Keyword(s):  
Point Of View ◽  
Passive Components ◽  
Voltage Mode ◽  
Sinusoidal Oscillators ◽  
Integration Point ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
Quadrature Oscillators

A number of sinusoidal oscillators using current differencing buffered amplifiers (CDBAs) have been reported in the literature. However, only three of them are canonic quadrature oscillators (i.e., requiring two capacitors). The aim of this letter is to present additional realizations of single/dual-resistance-controlled quadrature oscillators using CDBAs. Four voltage-mode quadrature oscillators are proposed, which provide the following advantageous features: (i) use of reduced and canonic component count, viz. two CDBAs, three/four resistors and two capacitors, (ii) all passive components are grounded or virtually grounded, which is favorable from integration point of view and (iii) independent and non-interactive resistor control of the condition of oscillation (CO) and the frequency of oscillation (FO). Simulation results verifying the workability of the proposed circuits have been included.

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.

scholarly journals Realization of SIMO biquad filters and quadrature sinusoidal oscillators using OTRAs

2021 ◽  
Author(s):  
Garima Garima ◽  
◽  
Pragati Kumar ◽  
Data Ram Bhaskar ◽  
◽  
...  
Keyword(s):  
Quality Factor ◽  
Experimental Validation ◽  
Low Frequency ◽  
Spice Simulation ◽  
Sinusoidal Oscillators ◽  
Input Multiple Output ◽  
Condition Of Oscillation ◽  
Single Input ◽  
Simulation Results ◽  
Quality Factor Q

In this communication, two single-input multiple-output (SIMO) type biquad filters employing operational transresistance amplifiers (OTRAs) have been presented. Various parameters of the proposed filter circuits viz. pole frequency (ɷ), pole quality factor (Q) and the gain are independently controllable. The proposed filter configurations can also be converted into low frequency oscillators with fully uncoupled control of condition of oscillation and frequency of oscillation with quadrature output voltages. The active and passive sensitivities of the proposed circuits have been found to be small. SPICE simulation results and experimental validation of the proposed circuits employing OTRAs realized with AD844 type CFOAs have also been presented.

scholarly journals Voltage-Mode All-Pass Filters Including Minimum Component Count Circuits

2007 ◽  
Vol 2007 ◽  
pp. 1-5 ◽  
Author(s):  
Sudhanshu Maheshwari
Keyword(s):  
Active Element ◽  
Passive Component ◽  
Output Impedance ◽  
Passive Components ◽  
First Order ◽  
Voltage Mode ◽  
Pspice Simulation ◽  
Simulation Results ◽  
A Current

This paper presents two new first-order voltage-mode all-pass filters using a single-current differencing buffered amplifier and four passive components. Each circuit is compatible to a current-controlled current differencing buffered amplifier with only two passive elements, thus resulting in two more circuits, which employ a capacitor, a resistor, and an active element, thus using a minimum of active and passive component counts. The proposed circuits possess low output impedance, and hence can be easily cascaded for voltage-mode systems. PSPICE simulation results are given to confirm the theory.

scholarly journals Condition of phase angle for a new VDGA-based multiphase variable phase shift oscillator from 0o to 90o

2020 ◽  
Vol 10 (4) ◽  
pp. 3801
Author(s):  
Kasim K. Abdalla
Keyword(s):  
Phase Angle ◽  
Harmonic Distortion ◽  
Cmos Technology ◽  
Electronic Control ◽  
Variable Phase ◽  
Voltage Mode ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
First Time ◽  
Modern Building

A novel interesting type of variable phase angle voltage mode oscillator using modern building block has been presented in this paper. The new proposed oscillator configuration which uses four voltage differencing gain amplifier (VDGA) and two grounded capacitors can generate two sinusoidal signals that change out of phase by 0 to 90 degree. It has four floating and explicit voltage mode outputs where every two outputs have the same phase. The circuit is characterized by (i) the condition of phase angle of the oscillation (PO) (this concept is introduced for the first time in this paper) can be tuned electronically (ii) the gain of the floating outputs can be controlled independently (iii) it provides electronic control of condition of oscillation (CO) and independent control of frequency of oscillation (FO). The Total Harmonic Distortion (THD) of the output waveforms was obtained and the results were reasonability values (less than 4.5%). The non-ideal analysis and simulation results are investigated and confirmed the theoretical analysis based upon VDGAs implementable in 0.35μm CMOS technology. Simulation results include time response and frequency response outputs generated by using the PSPICE program.

Realization Approach for Sinusoidal Signal Generation and Circuit with Easy Control

2019 ◽  
Vol 29 (02) ◽  
pp. 2050031
Author(s):  
S. Maheshwari
Keyword(s):  
Frequency Control ◽  
Building Blocks ◽  
Gain Factor ◽  
Sinusoidal Signal ◽  
Current Feedback ◽  
Passive Components ◽  
Current Feedback Operational Amplifiers ◽  
Condition Of Oscillation ◽  
Quadrature Oscillators ◽  
Simple Analog

A new approach for realizing sinusoidal signal with quadrature property is proposed, which employs simple analog building blocks and facilitates easy tuning of the oscillation frequency, through a gain factor. The proposed approach is used for realizing a novel quadrature oscillator circuit, which requires three current feedback operational amplifiers and passive components. The proposed circuit provides outputs at low impedance terminals, and benefits from easy control over the frequency of oscillation (FO), which depends on resistive ratio, rather than absolute resistor values. The frequency control is also independent of the condition of oscillation (CO). The nonideal effects and the parasitic studies are presented. The verification of the proposed realization scheme for quadrature oscillators and the new circuit is carried out through both simulation studies and experimental results, using the commercially available chips.

scholarly journals Voltage-Mode Four-Phase Sinusoidal Generator and Its Useful Extensions

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Sudhanshu Maheshwari
Keyword(s):  
High Frequency ◽  
Second Order ◽  
Voltage Mode ◽  
Active Elements ◽  
Generator Circuit ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
Parasitic Effects

This paper introduces a new voltage-mode second-order sinusoidal generator circuit with four active elements and six passive elements, including grounded capacitors. The frequency and condition of oscillation can be independently controlled. The effect of active element’s nonidealities and parasitic effects is also studied; the proposed topology is good in absorbing several parasitic elements involved with the active elements. The circuit is advantageous for generating high frequency signals which is demonstrated for 25 MHz outputs. Several circuit extensions are also given which makes the new proposal useful for real circuit adoption. The proposed theory is validated through simulation results.

scholarly journals Isomorphic Circuits of Independent Amplitude Tunable Voltage-Mode Bandpass Filters and Quadrature Sinusoidal Oscillators

2021 ◽  
Vol 11 (16) ◽  
pp. 7431
Author(s):  
San-Fu Wang ◽  
Hua-Pin Chen ◽  
Yitsen Ku ◽  
Wei-Yuan Chen
Keyword(s):  
Integrated Circuits ◽  
Bandpass Filters ◽  
Center Frequency ◽  
Amplitude Control ◽  
Voltage Mode ◽  
Sinusoidal Oscillators ◽  
Independent Amplitude ◽  
Wide Range ◽  
Sinusoidal Waveform ◽  
Condition Of Oscillation

This paper presents isomorphic circuits of voltage-mode (VM) non-inverting bandpass filters (NBPFs) and VM quadrature sinusoidal oscillators (QSOs) with independent amplitude control functionality. The proposed VM NBPFs and VM QSOs exhibit low-output impedance and independent amplitude control, which are important for easily cascading the VM operation and independent control of the amplitude gain. The proposed isomorphic circuits employ three LT1228 commercial integrated circuits (ICs), two grounded capacitors, two grounded resistors and one floating resistor. The use of grounded capacitors is beneficial for the implementation of the IC. Both NBPFs have a high-input impedance and have a wide range of independent amplitude tunable passband gain without affecting the quality factor (Q) and center frequency (fo). The Q and fo parameters of the proposed NBPFs are orthogonal tunability. By feeding back each input signal to the output response of the NBPF, two VM fully uncoupled QSOs are also proposed. The proposed VM fully uncoupled QSOs have two quadrature sinusoidal waveforms with two low-output impedances and one independent amplitude tunable sinusoidal waveform. The frequency of oscillation (FO) and the condition of oscillation (CO) are fully uncoupled and controlled electronically. The performances of the proposed isomorphic circuits have been tested with a ±5 volt power supply and are demonstrated by experimental measurements which confirm the theoretical assumptions.

Voltage Differencing Gain Amplifier-Based Sinusoidal Quadrature Oscillator Using Only Two Grounded Capacitors

2019 ◽  
Vol 12 (5) ◽  
pp. 439-444 ◽  
Author(s):  
Orapin Channumsin ◽  
Worapong Tangsrirat
Keyword(s):  
Computer Simulations ◽  
Process Parameters ◽  
Point Of View ◽  
Model Parameters ◽  
Cmos Process ◽  
Quadrature Oscillator ◽  
Active Devices ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
Sensitivity Performance

Background: This article describes the circuit construction of the sinusoidal quadrature oscillator using two Voltage Differencing Gain Amplifiers (VDGAs) as active devices. Methods: Since the presented oscillator circuit uses only two external grounded capacitors as passive elements, it is quite suitable for monolithic integration point of view. The condition of oscillation and the frequency of oscillation are non-interactive, and can be controlled electronically by tuning two separate biasing currents. Non-ideal analysis and sensitivity performance are also discussed. Results: The feasibility of the designed oscillator is justified by the PSPICE simulation results based on TSMC 0.35-µm CMOS process parameters. Conclusion: The effects of the VDGA non-idealities on the proposed circuit are also provided, and the computer simulations based on TSMC 0.35-mm CMOS model parameters are included to evaluate the performance of the circuit.

scholarly journals New Realizations of Single OTRA-Based Sinusoidal Oscillators

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Hung-Chun Chien
Keyword(s):  
Oscillation Frequency ◽  
Frequency Stability ◽  
Experimental Results ◽  
Sensitivity Analyses ◽  
Independent Control ◽  
Passive Components ◽  
The Third ◽  
Sinusoidal Oscillators ◽  
Condition Of Oscillation ◽  
Oscillator Circuits

This study proposes three new sinusoidal oscillators based on an operational transresistance amplifier (OTRA). Each of the proposed oscillator circuits consists of one OTRA combined with a few passive components. The first circuit is an OTRA-based minimum RC oscillator. The second circuit is capable of providing independent control on the condition of oscillation without affecting the oscillation frequency. The third circuit exhibits independent control of oscillation frequency through a capacitor. This study first introduces the OTRA and the related formulations of the proposed oscillator circuits, and then discusses the nonideal effects, sensitivity analyses, and frequency stability of the presented circuits. The proposed oscillators exhibit low sensitivities and good frequency stability. Because the presented circuits feature low impedance output, they can be connected directly to the next stage without cascading additional voltage buffers. HSPICE simulations and experimental results confirm the feasibility of the new oscillator circuits.

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.

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