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# Residual phase noise of HMC575 and HMC573

The datasheets of the HMC575 and HMC573 frequency doublers only give residual phase noise at 100 kHz offset. Can you perhaps provide a graph over a wider offset frequency range?

Thanks.

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• Admittedly this should be easier to answer than it is.  I have not been able to find the original characterization data.  I was able to determine the number in the HMC575 datasheet was based on 4GHz input frequency.  From there you can mathematically determine some reasonable numbers using these formulas.

100kHz PN = datasheet number + 10*log(fout/4GHz)

For different phase offset you can use a 10*log(offset frequency) curve.

What particular frequencies and offset are you interested in?

• Hi Chris.

My requirement is to multiply 3.6 GHz to 14.4 GHz. I am mostly interested in the phase noise at the higher offsets, i.e. 1 MHz and 10 MHz. If I look at the phase noise graphs for the HMC561, HMC368 and HMC814, also frequency doublers, it seems as if the drop in PN is slightly less than 10 dB /decade, but I could make an estimate based on those, if you think they are representative?

In contrast, the phase noise of the X4 multiplier HMC370 already bottoms out at 100kHz and doesn't drop much after that. I am worried that the HMC575 and HMC573 might do the same.