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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.

Single VDCC-based electronically tunable voltage-mode second order universal filter

Uttaphut P.

Przegląd Elektrotechniczny

2018

R. 94, nr 4

22--25

A design of second-order multiple-input single-output voltage-mode universal filter is presented in this paper. The proposed filter consists of single voltage differencing current conveyor (VDCC), single resistor and two capacitors. The new circuit provides five filter responses namely, lowpass, high-pass, band-pas, band-reject and all-pass functions. Each output filter response can be selected without the requirement of the matching condition and double gain amplifier for selecting all-pass function. The tuning of natural frequency and quality factor can be electronically done. The proposed circuit only uses single active element, which can be easily implemented as an integrated circuit. The MOS modeling of VDCC and Pspice simulation of proposed filter were carried out on TSMC 0.18 micrometer CMOS technology

Opisano uniwersalny filtr drugiego rzędu wykorzystujący układ VDCC (voltage differencing current conveyor). Częstotliwość graniczną filtru i jego dobroćmoga być dobierane elektronicznie. Zaproponowany filtr opracowano w technologii CMOS 0.18 mikrometra.