School of Physics and Electronic Engineering;
Xian yang Normal University;
Xianyang 712000;
Shaanxi;
China;
School of Information Engineering;
Shaanxi Institute of International Trade&Commerce;
Xi'an 712046;
Shaanxi;
China;
current-mode circuit; Sallen-Key analog filter; compact voltage differential trans-conductance amplifiers(VDTA); adjoint network theorem; nodal admittance matrix expansion;