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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.