HMC7044 OSCOUT phase noise

Hi Andy, 

We don't have additive noise measurement for OSCOUT buffers. 

However, I took some measurements in the past.

The noise floor of HMC7044’s OSCOUT buffer is around -155dBc/Hz at 125MHz.  I added a measurement to show phase noises of a) SMA100B signal generator output (Blue) vs b) HMC7044 OSCOUT Buffer output when OSCIN is fed with SMA100B (Black).   

Another measurement compares HMC7044 OSCOUT performance when OSCIN is fed by a CVHD-950 crystal oscillator. 

Another measurement shows the performance of ADF4371 when the reference is fed by the OSCOUT buffer vs CVHD-950. This might be more close to your application.  

PN measurement of ADF4371 (green: Reference is CVHD-950, blue: OSCOUT from HMC7044 while OSCIN is CVHD-950)

Thanks,

Emrecan

That's very helpful, thank you. Are you able to tell me what driver mode you were using for the tests please? Is it the default, which I think is CML without internal resistors?

Hi Andy, 

I used the LVPECL output buffer type. CML also performs similarly. For CML measurements, I have used the default configuration which internal 100 is enabled. 

Thanks,

Emrecan