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Current-mode sinusoidal quadrature oscillator with independent control of oscillation frequency and condition using CDTAs
(2010-05-01)
Tangsrirat, Worapong
;
Tanjaroen, Wason
A current-tunable current-mode sinusoidal quadrature oscillator, constructed from only three current differencing transconductance amplifiers (CDTAs) and two grounded capacitors with the absence of the passive resistors, is presented and analyzed. The proposed oscillator provides the important advantage of non-interactive electronic control of the oscillation condition and the oscillation frequency (ω<inf>0</inf>) and is capable of generating two quadrature current outputs. The circuit exhibits low active and passive sensitivities and is suitable for integration. Theoretical results are verified with PSPICE simulations.
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Resistorless current-mode quadrature sinusoidal oscillator using CDTAs
(2009-12-01)
Tanjaroen, Wason
;
Tangsrirat, Worapong
A circuit technique for realizing a current-mode quadrature sinusoidal oscillator using current differencing transconductance amplifiers (CDTAs) as active components is presented in this paper. The proposed circuit employing only three CDTAs and two grounded capacitors can provide two quadrature sinusoidal current outputs with 90° phase difference. The oscillation condition and the oscillation frequency (ω<inf>o</inf>) of the proposed circuit can be electronically and orthogonally tuned. Simulation results with PSPICE are used to confirm the presented theory.
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Electronically tunable phase shifter using CDTAs
(2009-12-01)
Marungreang, Nattaphon
;
Tanjaroen, Wason
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
The realization of an electronically tunable phase shifter using current differencing transconductance amplifiers (CDTAs) as active components is presented. The proposed filter employs only two CDTAs and one virtually grounded capacitor, which its phase shift can be electronically adjusted by varying the bias current of the CDTA. The circuit also exhibits high-output impedance, which is easy cascading in the current-mode operation. As application example, the current-mode biquad filter based on the proposed CDTA-based phase shifter circuit is also presented. PSPICE simulation results of the proposed circuit and its application are given to confirm the theoretical analysis.
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Current-mode multiphase sinusoidal oscillator using CDTA-based allpass sections
(2009-07-01)
Tangsrirat, Worapong
;
Tanjaroen, Wason
;
Pukkalanun, Tattaya
In this work, a current tunable current-mode multiphase sinusoidal oscillator (MSO) employing current differencing transconductance amplifier (CDTA)-based first-order allpass sections is presented. The proposed MSO circuit, which uses only two CDTAs and one virtually grounded capacitor for each phase, can generate arbitrary 2 n-phase current-output signals (n = 2, 3, 4, ...) equally spaced in phase, all at high output impedance terminals. The oscillation condition and the oscillation frequency can be controlled electronically and independently by adjusting the bias current of the CDTA. The oscillator has low-sensitivity performance. Simulation results are also given to verify the functionality of the proposed oscillator. © 2008 Elsevier GmbH. All rights reserved.
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Current-mode second-order notch filter using CDTA-based allpass sections
(2008-12-01)
Tanjaroen, Wason
;
Tangsrirat, Worapong
A circuit technique for realizing a current-mode second-order notch filter using CDTA-based first order allpass sections is presented in this paper. The proposed circuit employs only four CDTAs and two virtually grounded capacitors, and exhibit low-input and high-output impedances, which is suitable for cascading in current-mode operation. The circuit also has low passive and active sensitivities. Moreover, if the active and passive component values are properly chosen, the circuit permits the realization of second-order allpass current response. PSPICE simulation results are used to verify the theoretical analysis. © 2008 SICE.
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Resistorless current-mode first-order allpass filter using CDTAs
(2008-10-06)
Tanjaroen, Wason
;
Tangsrirat, Worapong
The realization of a resistorless current-mode first-order allpass filter using current differencing transconductance amplifiers (CDTAs) as active components is presented. The proposed filter employs only two CDTAs and one virtually grounded capacitor, which its phase shift can be electronically adjusted by varying the bias current of the CDTA. The circuit also exhibits high-output impedance, which is easy cascading in the current-mode operation. As application example, the current-mode biquad filter based on the proposed CDTA-based allpass sections is also presented. PSPICE simulation results of the proposed circuit and its application are given to confirm the theoretical analysis. © 2008 IEEE.
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Current-mode multiphase sinusoidal oscillator using current differencing transconductance amplifiers
(2008-02-01)
Tangsrirat, Worapong
;
Tanjaroen, Wason
This paper describes a simple current-controlled current-mode multiphase sinusoidal oscillator based on current differencing transconductance amplifiers (CDTAs) as active components. The proposed oscillator circuit, which employs only one CDTA and one grounded capacitor for each phase, can generate arbitrary n current-output signals (n being even or odd) equally spaced in phase, all at high output impedance terminals. The oscillation condition and the oscillation frequency can be controlled electronically and independently through the bias current of the CDTA. The oscillator has low-component count, low-sensitivity performance, and is highly suitable for monolithic implementation. PSPICE simulation results are given to confirm the operation of the proposed oscillator. © Birkhäuser Boston 2007.
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TISO cascadable current-mode multifunction filter employing current differencing transconductance amplifiers
(2006-12-01)
Tanjaroen, Wason
;
Dumawipata, Teerasilapa
;
Tangsrirat, Worapong
A circuit realization of a current-mode multifunction filter with three inputs and one output employing current differencing transconductance amplifiers (CDTAs) as active components is presented in this paper. The proposed circuit employs only three CDTAs and two grounded capacitors and exhibit low-input and high-output impedances, which is very suitable for an integrated circuit implementation and easy cascading in the current-mode operations. By properly selecting the input current terminals, the proposed filter can realize all standard biquadratic functions, i.e., the lowpass (LP), highpass (HP), bandpass (BP), bandstop (BS) and allpass (AP) filtering functions without changing the circuit configuration. The natural frequency (ω<inf>0</inf>) and the bandwidth (ω<inf>0</inf>Q) of the proposed filter can electronically be tuned by controlling the bias current of the CDTA. The filter also provides the low active and passive sensitivities. Simulation results with PSPICE are used to confirm the presented theory. © 2006 ICASE.

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