Algorithm for Modulo Addition KHALED

When designing elliptic-function filters there is usually some margin in performance to be distributed over the defining parameters. A recent paper offered some comparatively complicated formulas for use in this stage of the design. However, a simpler method, originally due to Darlington, is available and i s described briefly. passband ripple is again given by (2). ‘The cd function is the same as the sn function by a real quarter period, just as the cosine is the same as the sine shifted by ~ / 2 . Using the cd function rather than the sn function as in [2], allows one to describe both odd and even degree cases with one common formula. Manuscript received April 28, 1989. This letter was recommended by The author is with the Electrical Engineering Department, University of IEEE Log Number 8930187. Associate Editor T. R. Viswanathan. California Los Angeles, Los Angeles, Ca 90024. OO98-4094/90/0500-oS31~$01 .OO 01990 IEEE Authorized licensed use limited to: University of Bridgeport. Downloaded on February 24,2010 at 11:38:37 EST from IEEE Xplore. Restrictions apply.