Digitally Programmable Multifunctional Filter and Multiphase Oscillator Using MOCCCII

The advancement in IC technology has led the recent trend of designing hybrid systems to benefit both analog and the digital world. Among analog building blocks, Multifunctional filters & Multiphase oscillator constitutes an important building block. We propose a novel current mode digitally programmable multifunctional filter and deduce a programmable multiphase oscillator providing four quadrature phase outputs. For the introduction of digital control in analog systems we use a digital control module comprising of R/2R ladder and analog switch array. The parameters of analog systems results in the form of digital word (N) of n-bits. All the realizations are designed and verified using PSPICE simulation tool with good results in support of the theory.