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Voltage-Mode first-order allpass filter with grounded capacitor and electronic controllability

Uttaphut Prungsak

Przegląd Elektrotechniczny

2019

R. 95, nr 3

101--104

A design and analysis of a voltage-mode first order allpass filter using the voltage differencing current conveyor (VDCC) is proposed in this paper. The synthesis of the proposed allpass filter is based on the connection of the voltage-mode lossy integrator and voltage-mode subtraction with single VDCC, single grounded capacitor and two resistors. The proposed filter is simple structure and grounded capacitor is attractive for integrated circuit implementation. The proposed circuit doesn’t use the active building block with multiple output current output terminal which is easy the design by using commercially available IC. The phase response of the proposed first order allpass filter is electronically tuned via the DC bias current of VDCC. The proposed filter doesn’t require the matching condition for simultaneously adjusting two parameters to control the phase response. The simulation results of the proposed filter are based upon the TSMC 0.18  m CMOS process and ±0.9V supply voltages.

Przedstawiono projekt i analizę filtru pierwszego rzędu wykorzystującego układ VDCC, uziemiona pojemność i dwa rezystory. Odpowiedź fazowa jest łatwa do strojenia za pośrednictwem prądu.

CCTA Based Current-mode First Order Filter and Its Application in Quadrature Oscillator

Summart S., Saetiaw C., Thongsopa C., Jaikla W.

Przegląd Elektrotechniczny

2013

R. 89, nr 6

104--108

This article presents a current-mode first order filter and application in quadrature oscillator circuit based on all-pass filter. The filter circuit using only single CCTA and single grounded capacitor. It is able to provide low-pass, high-pass and all-pass function. Morover, the proposed oscillator can provide two sinusoidal output currents with 90 degrees phase difference. The filter and oscillator circuits use only grounded capacitors without any external resistor and have high output impedance appropriate for cascade connection application in current mode which is capable to directly drive load. This qualification is very appropriate for further development into an integrated circuit. The results of PSPICE simulation program are corresponding to the theoretical analysis.

W artykule przedstawiono prądowy filtr pierwszego rzędu i jego zastosowanie w generatorze kwadraturowym. Układ filtru wykorzystuje uziemiony kondensator i układ CCTA (current conveyor transconductance amplifier). Generator umożliwia wytwarzanie dwóch prądów sinusoidalnych przesuniętych w fazie o 90°.