Systematic Approach to the Design of Reconnection-Less Reconfigurable Filters Using the Method of Unknown Nodal Voltages

The paper introduces a systematic approach to the design of reconnection-less reconfigurable filters based on the Method of Unknown Nodal Voltages (MUNV). The used approach of previously proposed filters is based on the trial and error (personal experience) selection of parameters of the factorization of the algebraic complements for Laplace expansion of the sub-determinants while the newly proposed approach consists of the gradual placement of individual parameters into the specific matrix element(s) based on the knowledge of which position in the matrix is reflected in particular terms of the transfer function. The proposed approach provides following advantages in comparison to the standard MUNV: a) a more systematic design of MUNV based reconnection-less reconfigurable filters, b) it only requires returning to the selection of signs of individual parameters when the resulting transfer function does not meet its desired form, c) it can be adjusted for different circuits other than reconnection-less reconfigurable filters. The introduced approach is tested and verified for several previously proposed reconnection-less reconfigurable filters (based on MUNV method) and newly presented solution. The possibility to design other circuit types (shown for the design of an oscillator) is also presented. The behavior of the proposed filter is supported by PSpice simulations and experimental measurements in order to verify the design approach.