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Electronically Tunable Voltage-Mode Multiphase Sinusoidal Oscillator with Low Output Impedance Nodes Employing VD-DIBAs
(2023-01-01)
Duangmalai, Danupat
;
Manasri, Thosapol
;
Kwawsibsam, Adisorn
;
Jaikla, Winai
The multiphase sinusoidal oscillator (MSO) is useful for various electrical and electronic applications. This study aims to design an MSO employing voltage differencing differential input buffered amplifiers (VD-DIBAs). The design procedure is based on cascading the first-order low-pass filter. Each phase consists of a VD-DIBA, two resistors, and a grounded capacitor. An odd-phase system without requiring an additional amplifier. The frequency is electronically controlled through the bias current without affecting the condition. The sinewave amplitudes and the phase difference between each waveform are identical. The proposed MSO is designed to obtain three-phase waveforms (n = 3). PSPICE simulation demonstrates the performance of the proposed oscillator with 0.18 μm TSMC CMOS parameters with ±0.9 V power supply. The feasibility of the proposed MSO is also verified with experiments using the VD-DIBA constructed from commercial integrated circuits (ICs) with a ±5 V power supply. The simulated and experimental results align with theoretical predictions
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Electronically and Independently Controllable Quadrature Sinusoidal Oscillator with Low Output Impedances
(2022-09-01)
Kwawsibsam, Adisorn
;
Duangmalai, Danupat
;
Yeeyoun, Sittisak
;
Jaikla, Winai
This work presents the quadrature sinusoidal oscillator using two Voltage Differencing-Differential Input Buffered Amplifiers (VD-DIBAs), two resistors, and two capacitors. The VD-DIBA is an electronically controllable active building block with high input and low output impedances that can con-nect to other circuits directly without the buffers. With these distinguished features, the VD-DIBA is employed in this design. The proposed oscillator can produce two sine waves with a phase shift of 90 degrees. Over the entire tuning frequency range, the magnitude of the quadrature output voltages is constant. The proposed oscillator is independently adjustable in terms of frequency and oscillation condition. Moreover, the frequency of oscillation can be electronically and lin-early adjusted by the bias currents. The condition of oscillation is adjustable by resistors, R<inf>1</inf> and R<inf>2</inf> . The performances of the proposed quadrature oscillator are tested through the PSpice simulation and the experiment. In the simulation, the VD-DIBA is built from the 0.18 µm Taiwan Semiconductor Manufactur-ing Company (TSMC) CMOS process with ±0.9 V supply voltages. In the experiment, the VD-DIBA is implemented using the commercial ICs, LM13700, and AD830 with ±5 V supply voltages. The simulated To-tal Harmonic Distortion (THD) values of the output voltages, V<inf>o1</inf> and V<inf>o2</inf> at f<inf>0</inf> = 1.03 MHz are 1.63 % and 1.81 %, respectively. The experimental THD values of the output voltages, V<inf>o1</inf> and V<inf>o2</inf> at f<inf>0</inf> = 536.6 kHz, are 1.43 % and 1.00 %, respectively.
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New quadrature sinusoidal oscillator with amplitude controllability
(2014-01-01)
Chandee, Sasithon
;
Jaikla, Winai
;
Suwanjan, Peerawut
;
Pookrongtong, Nattapon
;
Kwawsibsam, Adisorn
The quadrature sinusoidal oscillator employing two voltage differencing tranconductance amplifiers (VDTAs) has been proposed. The condition of oscillation (CO) and frequency of oscillation (FO) can be independently controlled by adjusting the bias current of two VDTAs. The oscillator can provide two output voltages as quadrature waveform and one output current with magnitude controllability. It consists of two VDTAs and two grounded capacitors which is then suitable for IC architecture. The Pspice simulation results using 0.25μm TSMC CMOS parameters have justified the theoretical anticipation. © 2014 IEEE.
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Conception of simulating grounded negative inductor and implementation using operational transconductance amplifiers
(2013-12-31)
Kwawsibsam, Adisorn
;
Lahiri, Abhirup
;
Jaikla, Winai
This paper presents a novel realization of a grounded negative inductor simulator (NIS). The conception of creating grounded NIS is discussed and then a possible circuit realization using operational transconductance amplifier (OTA) is provided. The proposed circuit realization employs only two OTAs, one voltage summing circuit and three capacitors. PSPICE simulations have validated the workability of the proposed NIS in the operating frequency of 10kHz to 10MHz. © 2013 IEEE.
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Current controlled current-mode universal filter using CCCCTAs
(2011-09-22)
Siripongdee, Surapong
;
Kwawsibsam, Adisorn
;
Jaikla, Winai
This article presents a current-mode universal filter based-on parallel RLC circuit using CCCCTAs as active element. The pole frequency and quality factor can be electronically/ orthogonally controlled via input bias currents. The circuit description consists of merely 2 CCCCTAs and 2 grounded capacitors. Without any external resistors, the proposed circuit is then suitable for IC architecture. The proposed circuit due to high output impedances enable easy cascading in current-mode. The PSPICE simulation results are depicted, and the given results agree well with the theoretical anticipation. © 2011 IEEE.

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