z-Transform Its z-transform is given by X(z)=∑-0 ∑ 1=-0 m=1 nn a Z Oz∑O m=0 for a 1-0z ROC is the annular region z<al 13 Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 13 z-Transform • Its z-transform is given by • ROC is the annular region = − = −   = − − =− − 1 1 ( ) m m m n n n Y z z z , for 1 1 1 1 1   − = − − z z z z z z m m m 1 1 0 1 1 −  − = − − −  = −  = − z  