Jirasak Chanwutitum

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This paper presents a new mixed-mode quadrature oscillator using one current controlled current conveyor (CCCII), one CCCII with controlled current gain and two grounded capacitors. The oscillation condition and the oscillation frequency can be controlled orthogonally and electronically by the bias currents of the CCCIIs. The circuit provides two quadrature(More)
A new high input impedance electronically tunable voltage-mode first-order all-pass filter using three simple CMOS operational transconductance amplifiers (OTAs) and one grounded capacitor is presented. The corner frequency can be controlled electronically by adjusting the bias currents of OTAs. Critical component matching conditions are not required in the(More)
In this paper, a new electronically tunable current-mode universal filter with three inputs and single output employing only two translinear current conveyors and two grounded capacitors is presented. The proposed configuration provides lowpass, bandpass, highpass, bandstop and allpass current responses by choosing appropriate input signals without any(More)
A low-power and low-voltage simple CMOS exponential function generator circuit is proposed. It is based on simple current mirrors able to operate at low supply voltage. The design of the circuit is based on Taylor series expression for realizing the exponential characteristic and of MOS transistor operating in the saturation region. Simulation using the(More)
This paper presents a new voltage-mode universal biquadratic filter using operational transresistance amplifiers as active building block. The proposed circuit offers the following attractive advantages: realization of highpass, bandpass, lowpass filters, simultaneously, from the same circuit, no requirements for component-matching conditions for realizing(More)
This paper presents a new electronically tunable voltage-mode first-order allpass filter using only three single-ended operational transconductance amplifiers (OTAs) and one grounded capacitor, which is highly suitable for integrated circuit implementation. The pole frequency of the filter can be tuned electronically by adjusting the transconductance value(More)
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