Crosstalk allocation method in design of broadband analog switching equipment

In the design of concentration and distribution stages of analog video signal systems, the use of broadband analog switches helps to reduce the number of expensive bandwidth-reduction CODECs. However, these switches must satisfy severe crosstalk attenuation requirements. To suppress the crosstalk, switch components and packaging must be chosen carefully and switch configurations and their implementation must also be considered. Moreover, the conventional design for one-to-one crosstalk cannot be applied to a distribution service for video signals, and a more detailed design that considers crosstalk phase conditions is required. However, no method of allocating the crosstalk attenuation objective to each component in the switch has yet been established for connecting one inlet to multiple outlets. This paper presents a model for crosstalk addition based on the generation mechanism of crosstalk and proposes the concept of equivalent power sum multiplicity. Using this model and concept, a method is proposed of allocating a crosstalk attenuation objective to each component of the switch in order to satisfy the overall quality.