Design of VD-DDCC for novel dual mode universal filter with grounded passive components

Abstract

This paper presents a novel dual mode multifunction filter using Voltage Differencing Differential Difference Current Conveyor (VD-DDCC) as active element. The filter provides low pass (LP), high pass (HP), band pass (BP), notch pass (NP) and all pass (AP) responses in voltage mode (VM) and transadmittance mode (TAM). The filter employs two VD-DDCC, two capacitors and three resistors. All passive components are grounded which is advantageous. The filters have the ability to operate in dual mode and don’t require any capacitive matching. Quality factor of the filter can be tuned independent of the pole frequency. Input impedance for (VM & TAM) is high and output impedance for (TAM) is high as well. Double/negative voltage input signals for filter response realization are not required. The VD-DDCC and the filter circuit is designed and validated in Cadence Virtuoso Analog Design Environment using 0.18μm pdk from Silterra Malaysia at supply voltage of ± 1V. The achieved results are very close to the theoretical finings.