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A miniature tunable quadrature shadow oscillator with orthogonal control
(2023-10-01)
Buakaew, Seangrawee
;
Wongtaychatham, Chariya
This article presents a new design of a quadrature shadow oscillator. The oscillator is realized using one input and two outputs of a second-order filter cell together with external amplifiers in a feedback configuration. The oscillation characteristics are controlled via the external gain without disturbing the internal filter cell, following the concept of the shadow oscillator. The proposed circuit configuration is simple with a small component-count. It consists of, two voltage-different transconductance amplifiers (VDTAs) along with a couple of passive elements. The frequency of oscillation (FO) and the condition of oscillation (CO) are controlled orthogonally via the dc bias current and external gain. Moreover, with the addition of the external gain, the frequency range of oscillation can be further extended. The proposed work is verified by computer simulation with the use of 180 nm complementary metal–oxide–semiconductor (CMOS) model parameters. The simulation gives satisfactory results of two sinusoidal output signals in quadrature with some small total harmonic distortions (THD). In addition, a circuit experiment is performed using the commercial operational transconductance amplifiers LM13700 as the active components. The circuit experiment also demonstrates satisfactory outcome which confirms the validity of the proposed circuit.
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1.2 V differential difference current conveyor using MIGD MOST technique and its applications
(2023-01-01)
Kumngern, Montree
;
Khateb, Fabian
;
Phatsornsiri, Punnavich
;
Jongchanachavawat, Wirote
;
Kulej, Tomasz
This paper presents a new differential difference current conveyor (DDCC), realized using multiple-input gate-driven MOS transistor (MIGD MOST) technique. The application of MIGD MOST can reduce the number of differential pairs in the input stage of the DDCC, thus simplifying its overall structure. Unlike previous DDCC, the output stage of the circuit operates in super class-AB, that offers low static power consumption, high load driving capability and improved gain-bandwidth product (GBW).The proposed DDCC can work with the supply voltage of 1.2 V and consumes 44.2 μW of power. The proposed DDCC has been used to realize a versatile circuit that can work as a universal filter or a quadrature oscillator into a single topology. When the circuit works as a universal filter, it can realize low-pass, band-pass, high-pass, band-stop and all-pass voltage responses. The natural frequency and the quality factor of these responses can be orthogonally controlled. When the circuit works as a quadrature oscillator, the condition and the frequency of oscillators can be orthogonally controlled. The proposed MIGD DDCC and the proposed universal filter and quadrature oscillator have been simulated with SPICE, using 0.18 μm CMOS process parameters to prove the functionality and workability of the new circuits.
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Quadrature Sinusoidal Oscillator with Grounded Resistors and Capacitors Using VDCCs
(2021-03-10)
Satipar, Den
;
Intani, Pattana
;
Jaikla, Winai
This paper presents the quadrature oscillator using voltage differencing current conveyors (VDCCs)-based on the LC circuit parallel to the positive and negative resistors. In this design, two active devices, VDCC is constructed with two grounded capacitors and three grounded resistors. The sine waves are obtained both voltage and current mode. It can generate quadrature sinusoidal voltage output and two current outputs with amplitude controllability. Two current outputs with high impedance are180ºdegree phase difference are also obtained. Adjusting the condition and frequency of signal generation can be done independently via electronic feature. The total harmonic distortion is less than 0.97 % and power consumption at a maximum frequency of 1.12MHz is 1.82mW at power supply voltages ±0.9 V. The workability of the circuit is verified by PSPICE.
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Electronically Tunable Quadrature Sinusoidal Oscillator Using VDDDAs
(2021-03-10)
Satipar, Den
;
Intani, Pattana
;
Jaikla, Winai
This research proposes the sinusoidal oscillator that can provide two sine waves with 90° degree phase shift. The proposed oscillator is derived from lossy and lossless integrator circuits. The proposed quadrature sinusoidal oscillator uses one resistor, two grounded capacitors and two active elements, called voltage differencing differential difference amplifier (VDDDA). By adding additional two resistors, the voltage magnitude of a sinusoidal signal is controllable with low impedance output voltage node. The frequency of the generated sine wave and the condition of oscillation is orthogonally adjusted. In addition, the condition of the signal generator can be adjusted electronically. The performance of the presented sine wave generator has been validated through Pspice simulation. The active element, VDDDA is implemented from two commercial ICs, LM13700 and AD830.
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Programmable Universal Filter and Quadrature Oscillator Using Single Output Operational Transconductance Amplifiers
(2021-01-01)
Knobnob, Boonying
;
Torteanchai, Usa
;
Kumngern, Montree
This paper presents a new programmable universal filter and quadrature oscillator based on the single output operational transconductance amplifiers (OTAs). The proposed universal filter and quadrature oscillator can be achieved into single topology by programming analog switches. When the circuit performs as a universal filter, it can realize low-pass, high-pass, band-pass, band-stop and all-pass filters with orthogonal and electronic controls of the natural frequency and quality factor. When the circuit performs as a quadrature oscillator, it provides a three-phase quadrature output signal which the condition and frequency of oscillations can be controlled orthogonally and electronically. The proposed structure can be realized based on the single output OTAs which are easily implemented as both commercially available integrated circuits (ICs) as OTAs and complementary metal-oxide semiconductor (CMOS) OTAs as IC forms. SPICE simulation using standard 0.18 µm CMOS process is used for investigating the performance of the proposed circuit whereas the workability of new circuit is confirmed by LM13600 discrete-component integrated circuits as OTAs.
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Single VDGA-based dual-mode multifunction biquadratic filter and quadrature sinusoidal oscillator
(2020-01-01)
Tangsrirat, Worapong
;
Pukkalanun, Tattaya
;
Channumsin, Orapin
This article relates to the realization of voltage-mode and/or current-mode multifunction biquadratic filter and quadrature oscillator circuits each using one voltage differencing gain amplifier (VDGA), two resistors and two grounded capacitors. The proposed dual-mode filter having one output and three inputs can provide the three standard biquadratic transfer functions with both voltage and current output filter responses simultaneously. It also has the independent tuning of the angular resonance frequency and the quality factor. With a slight modification of the proposed filter, a new dual-mode quadrature sinusoidal oscillator can be obtained. The proposed quadrature oscillator provides orthogonal resistive/electronic control of both oscillation condition and oscillation frequency. Non-ideal and parasitic conditions are also examined and their effects on the circuit performance are discussed. To confirm the theory, several computer simulation results with PSPICE program are given.
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Current-mode universal filter and quadrature oscillator using current controlled current follower transconductance amplifiers
(2019-08-15)
Kumngern, Montree
;
Khateb, Fabian
This paper presents a new current-mode quadrature oscillator and universal filter that employs two current controlled current follower transconductance amplifiers and two grounded capacitors. The proposed circuit can be realized either as a quadrature oscillator or as a universal filter without changing circuit topology. In case the circuit works as a quadrature oscillator, the condition and the frequency of oscillation can be independently and electronically controlled. Four-phase quadrature current outputs and two-phase quadrature voltage outputs can also be obtained. In case the circuit works as a universal filter, low-pass, high-pass, band-pass, band-stop and all-pass filtering functions can be obtained simultaneously by appropriately selecting the input and output signals. The natural frequency and the quality factor of filter can also be obtained independently and electronically. PSPICE simulation results are used to verify the workability of the new topology.
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Quadrature oscillator and universal filter based on translinear current conveyors
(2018-09-01)
Kumngern, Montree
;
Wareechol, Eakluck
;
Phasukkit, Pattarapong
This paper presents quadrature oscillator and universal filter based on translinear current conveyors. The proposed circuit can realize as a quadrature oscillator or a universal filter without changing the circuit topology. When it works as a quadrature oscillator, four quadrature current outputs and two quadrature voltage outputs can be obtained. The condition and frequency of oscillation of oscillator can be controlled orthogonally and electronically. When it works as a universal filter, low-pass, band-pass, high-stop, band-stop, and all-pass filtering functions can be obtained simultaneously. The natural frequency and quality factor of filters can be controlled orthogonally and electronically. The proposed topology is simulated using PSPICE simulators and experimental results are also used to confirm workability of new circuit.
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Quadrature oscillator/universal filter using CCCII with adjustable gain
(2018-07-02)
Wareechol, Eakluck
;
Kumngern, Montree
;
Torteanchai, Usa
This paper presents a quadrature oscillator and universal filter using current controlled current conveyor with adjustable gain as active element. The proposed circuit combines a quadrature oscillator and a universal filter without changing the topology. In the case that the circuit works as a quadrature oscillator, two quadrature voltage outputs and four quadrature current outputs can be obtained. The condition of oscillation and frequency of oscillation can be orthogonally controlled. In the case that the circuit works as a universal filter, low-pass, band-pass, high-stop, band-stop, and all-pass filtering functions can be obtained. The natural frequency and quality factor of filters can be electronically controlled. The proposed topology is simulated using PSPICE simulators to confirm the workability of the new circuit.
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Exponentially tunable voltage controlled quadrature oscillator
(2017-10-19)
Sotner, Roman
;
Jerabek, Jan
;
Petrzela, Jiri
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Domansky, Ondrej
;
Jaikla, Winai
This paper deals with appropriate method of tunability extension in quadrature oscillators. Exponential dependence of frequency of oscillations on DC control voltage is created in lossless integrators by utilization of two exponentially controlled variable gain amplifiers and diamond transistors. Proposed solution maintains all beneficial features (especially independent levels of output waveforms on tuning process) of the oscillator concept employing two lossless integrators in the single loop and electronically controllable negative resistor serving for adjusting of condition of oscillations. PSpice verifications based on simulations of macromodels of used active devices confirmed doubled tunability range in comparison to standard linear control of frequency obtained for the same change of DC driving voltage.

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