Common Mode Return Loss Consideration in Wirebond Packaging for High Speed SerDes Links

This paper discusses the trade-offs in performance and cost of high speed SerDes in wirebond package applications. While many protocol standards specify requirements for both common mode return loss and differential mode return loss, meeting both sets of requirements in low cost wirebond packages requires the designer to make significant trade-offs. The performance and cost impacts of improving common mode return loss in wirebond packaging is examined from several different points of view