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DS90UB934-Q1: DS90UB934-Q1 PCLK

Part Number: DS90UB934-Q1
Other Parts Discussed in Thread: DS90UB913A-Q1, DS90UB933-Q1

At present, when debugging the output signal of DS90UB934-Q1, it is found that the PCLK signal jitter is obvious: the PCLK 74MHZ signal detected at the receiving chip end of bt656 signal jumps around 300K, about 0.4%, which leads to failure of normal locking and conversion;

For other signal sources debugged on the receiving chip, the clock variation range is no more than 20kHz, and the jitter range is about 0.02%;

Would like to ask, what methods (such as modifying the setting register) can reduce the variation range of the clock signal?

  • Hello Kevin,

    The output jitter of 934 PCLK is a JTF (Jitter Transfer Function) based on the received input jitter from the FPD-Link side. So the main method for reducing the jitter on the output of 934 is to reduce the jitter input to the DS90UB933-Q1 or DS90UB913A-Q1 serializer which is attached to the 934. Also improving the signal integrity of the high speed FPD-Link channel by minimizing impedance discontinuities in the channel will help to reduce jitter which is added over the FPD channel 

    Best Regards,

    Casey