S 7.4 IIR Digital Filter Design: Bilinear Transformation Method Bilinear transformation :到 1+S Z三 1-S Above transformation maps a single point in the s-plane to a unique point in the z- plane and vice-versa Relation between G(z)and H.(s)is then given by ce)--非§7.4 IIR Digital Filter Design: Bilinear Transformation Method Above transformation maps a single point in the s-plane to a unique point in the z￾plane and vice-versa • Relation between G(z) and Ha(s) is then given by         − + − − = = 1 1 1 ( ) ( ) 2 1 z z T s a G z H s         + − = − − 1 1 1 2 1 z z T s s s z − + = 1 1 • Bilinear transformation