![]() ![]() To set each of the routing signal impedances to half the incoming differential cable impedance.Current expert opinion is that the PCB routing task is not to try to ensure a specific differential impedance is achieved, rather, to focus on ensuring the differential signal arrives in good condition at the target component as it travels from the external cabling.Īccording to Lee Ritchey, a noted industry high-speed PCB design expert, successful differential signaling requires: It is important to note that while the coupling ratio achieved in a twisted pair differential cable may be better than 99%, the coupling achieved in differential pair routing will typically be less than 50%. Typically this differential routing will interface to an external differential transmission system, such as a connector and cable. Another major advantage of differential signaling is that it minimizes electromagnetic interference (EMI) generated from the signal pair.ĭifferential pair PCB routing is a design technique employed to create a balanced transmission system able to carry differential (equal and opposite) signals across a printed circuit board. Differential signaling is inherently immune to common mode electrical noise, which is the most common interference artifact present in an electronic product. Differential signaling was developed to cater for situations where the logic reference ground of the signal source could not be well connected to the logic reference ground of the load. ![]() Typically this differential routing will interface to an external differential transmission system, such as a connector and cable.Ī differential signaling system is one where a signal is transmitted down a pair of tightly coupled carriers, one of these carrying the signal, the other carrying an equal but opposite image of the signal. ![]() Differential pair routing is a design technique employed to create a balanced transmission system able to carry differential (equal and opposite) signals across a printed circuit board. ![]()
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