Differential Clock Circuit design

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Design scheme of differential clock circuit

The differential clock circuit transmits the clock through a pair of complementary signals and enhances the anti-interference performance by leveraging the common-mode noise suppression capability of the differential pair. When designing, it is necessary to consider that the length difference of the differential pairs (CLK+ and CLK-) should be controlled within less than 5mil (0.127mm) to avoid common-mode noise caused by signal asymmetry. Ensure that the trace width, spacing and stacking structure of the differential pair are exactly the same. The common-mode filter inductor filters out common-mode interference on differential signals. The common-mode impedance selection range is 60Ω@100MHz to 120Ω@100MHz, with a typical value of 90Ω@100MHz. The capacitance value should not be too large, as it may affect the integrity of the signal. Ensure that the return path (ground plane) of the differential signal is closely attached to the signal layer to reduce the loop area. The clock chip should be placed as close to the load as possible to shorten the trace length. Stay away from high-frequency noise sources.

Differential clock EMC Circuit design scheme

CMF2012WD900MQT