equation icon  ( ) |_ ( )_ | -1 S x ---- V~ p--pS------ |_ --1--- ---- V~ -vxS-------- _| S (p) = hSWSv S± j(p) 1 - V (p)2 hSWS + (p- pS) rSWS ± j(p) 1- V (p)2 , (27) ± ±