Use of sample-and-hold delay circuits for synthesis of raised-cosine filters

A new technique is described in which f.e.t. sample-and-hold delay circuits are used to shape a square-wave digital pulse into a pulse whose spectrum approximates to a raised-cosine spectrum with 100% roll off. The technique, which is entirely digital, is examined both theoretically and experimentally, and it is found that the raised-cosine spectrum can be synthetised simply, and to a high degree of accuracy. The technique is easier to implement than methods based on conventional network synthesis.