HMC394 - Phase Noise Floor too high

Hello,

we are using the HMC394 5-bit counter in a clock synthesizer application.

The counter is set to divide by 20. The measured Phase Noise Floor from about 100 kHz to 10 MHz is -140 dBc/Hz with a clean input signal. We need it about 15 dB better, as indicated in the datasheet. What can be the reason for the poor noise floor?

Best Regards,

tom

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