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;