A novel impedance multiplier using low voltage digitally controlled CCII

The digitally controlled current conveyor has been used to realize a novel digitally controlled impedance multiplier. The realized impedance multiplier can provide positive or negative multiplying factor with directly or inversely proportional to an n-bit digital control word. The digitally controlled multiplier is utilized for the realization of a first order continuous time filter with low pass and high pass responses. The pole frequency of the filters is programmable through digital control word. The realized digitally controlled continuous time filter is designed and verified using PSPICE and the results thus obtained justify the theory.