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ABSTRACT: This paper proposes a new approach to implement a multiphase sinusoidal oscillator by using loop-back of n-cascaded high-pass sections form. Two CMOS current-controlled current conveyors (CCCII) and a grounded capacitor are constructed as a current-mode high-pass section for each phase. The orthogonally of oscillate condition and frequency of oscillation are obtained with their electronically controllable through current biased of CCCII. Multiphase sinusoidal outputs can be obtained with equally spaced in phase, 360/n degree. Third-order oscillator is raised up to confirm the theoretical agreement. Low-harmonic distortion of achieved sinusoidal output obtains less than 0.9%. The performances are carried out by PSpice for confirm its characteristics.
Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, 2009. ECTI-CON 2009. 6th International Conference on; 06/2009
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ABSTRACT: An active-only devices current-mode universal filter using the biquadratic transfer function is proposed. The proposed circuit is realized based on minimized active-only components count without external passive elements. The electronic resistors are used instead of 2 OTAs. The different kinds of filter function such as lowpass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. A quadrature oscillator can also be easily modified without changing circuit topology. The proposed circuit is realized by using 4 MOS transistors, 3 OTAs, and 2 Opamps. The parameters omega<sub>P</sub> and Q<sub>P</sub> can be electronically tuned independently through adjusting the transconductance gains of the OTAs. The simulation results are given by PSpice.
Intelligent Signal Processing and Communications Systems, 2008. ISPACS 2008. International Symposium on; 03/2009
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ABSTRACT: A new voltage-mode three inputs and one output universal biquadratic filter with high-input impedance employing six simple operational transconductance amplifiers (OTAs) and two grounded capacitors is presented. The proposed circuit offers the following features: realization of all the standard filter functions, that is, highpass, bandpass, lowpass, bandstop, and allpass filters; electronically tunable of the angular frequency through adjusting the bias currents/voltages of OTAs; no requirements for component matching conditions; high-input impedance good for cascadability for the voltage-mode circuits; the use of only grounded capacitors and require no resistor; low active and passive sensitivities. PSPICE simulation results that confirm the theoretical predictions are given.
Communications and Information Technologies, 2008. ISCIT 2008. International Symposium on; 11/2008
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ABSTRACT: This paper proposes an accurate electronically tunable current-mirror circuit based on translinear type-A (polarities alternative) topology. This circuit is realized by only 6 transistors with BJT technology. A shunt-feedback buffer principle is used in order to regulate its emitter voltage of translinear part. For current mirror behavior, output and input currents are identical with a small error. Current-gain can be obtained by adjusting the ratio of the 2 particular current sources. This proposed circuit is using only 6 transistors for the simple structure. The analysis of input, output resistance and current-gain are depicted. An extra transistor is added for maintained the transfer minimum error which is also proposed. The constant bandwidth more than 40 MHz of various current-gains can be obtained. From current output mathematic function, several applications such as current multiplier, current divider and tunable current mirror are certainly performed. Other applications are raised to confirm realistic applicable including squaring and square-rooting circuits. All characteristics and performances are carried out by PSpice for confirm their well operations.
Communications and Information Technologies, 2008. ISCIT 2008. International Symposium on; 11/2008
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ABSTRACT: A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Qp can be wide-range tuned independent from the omega<sub>p</sub> either changing of capacitor and transconductance gains. Moreover, the four different kind filter functions as lowpass, highpass, bandpass and band-reject response can be also obtained without changing circuit topology. The parameters omega<sub>p</sub> can be electronically tuned through adjusting the transconductance gains of the OTAs. The simulation results have been carried out by P Spice.
Communications and Information Technologies, 2007. ISCIT '07. International Symposium on; 11/2007
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ABSTRACT: A wide-range CMOS analog multiplier based-upon a quarter square algebraic identity technique is proposed. The transistors are operated in the both of saturation and ohmic regions. It consists of shunt-feedback buffer and active attenuator circuits that obtained to the voltage regulation circuits. This paper uses 16 transistors and 4 current sources with a ±1.5 V power supply. The wide input dynamic range voltage can be achieved reaching the power supply. The bandwidth is rather than 141 MHz and total harmonic distortion is smaller than 0.7%. The results are carried out by PSpice simulation program.
Intelligent Signal Processing and Communication Systems, 2005. ISPACS 2005. Proceedings of 2005 International Symposium on; 01/2006
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ABSTRACT: A CMOS voltage-controlled floating resistance (VCFR) with a new approach for non-linearity terms cancellation and temperature compensated technique is presented. The achieved circuit uses 17 MOS transistors that operated in ohmic region and saturation region. It consists of the voltage attenuator, voltage subtraction and voltage inverting circuits. These circuits performed as a voltage dependent source that bias to an ohmic transistor. The nonlinearity terms and threshold voltage are cancelled in order to a linearity and temperature effect minimization. A first-order low-pass filter with tunable a cut-off frequency is proposed as an application for confirmed a realistic VCFR. The characteristics are including a high linearity and the temperature compensation. The results are carried out by PSpice.
Communications and Information Technology, 2005. ISCIT 2005. IEEE International Symposium on; 11/2005
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ABSTRACT: A single low-supply CMOS analog multiplier based upon ohmic region of MOS transistors is presented. This paper describes a method to force the drain-source voltage (V<sub>DS</sub>) of MOS transistors to operate in ohmic region. The achieved circuit can be used a single low-power supply. The complete circuit contains 20 transistors and 8 current sources using a low-power supply +1.5 volts. This circuit has high performance with very high-linearity and low-distortion. The achieved input dynamic range operation is ±400 mV, the linearity error is smaller than 0.1% and total harmonic distortion is smaller than 0.25% for input range 800 mVp-p.
Communications and Information Technology, 2005. ISCIT 2005. IEEE International Symposium on; 11/2005
