Hi Marty,

I have news about this design, sorry for being offline too much time.

Regarding the VCO we used you are right, we are working very close to the AD797 limits but we could not afford +15V power supply.

The VCOs are working outside the datasheet…

Hi Mustafa,

The alternatives to the HMC440, which include LD, INV, and internal 200 ohm pull ups would be the HMC4069, HMC698, HMC699.  Each one has similar performance, just different divide ratios, so pick the one that suits your application.

Best…

Hi Dan,

A healthy reference signal would be a square wave at +5dBm without any strange edge perturbations.

The HMC699 will operate at 10MHz reference.  One thing to check is the series capacitor on the REF input.  At 10MHz input, you are going to want…

Hi there,

Please reference the EZ post below. The documents referred apply to all HMC PFD / INT PLL products including the HMC439, HMC440, HMC3716, HMC4069, HMC698 and HMC699.

https://ez.analog.com/message/286275?q=PFD

Best Regards,

Marty

Thank you very much, Huangzeyan!

Hi Sai,

I'm not aware of a Phase Frequency Detector (anywhere) with a higher input frequency than the ones I recommended. You can consider adding a prescaler before the HMC469 or HMC3716 to reduce the input frequency and keep 'N' small or consider…

ADF4152HV的规一化噪底比4002要高，仿真图上被相位噪声淹没了。但它们都是有1/f噪声的。4002的噪声确实比4152低9db。如果要求更低的噪声，可以看看hmc440和hmc699，它们的噪声比4152hv低20db，不过功耗上牺牲一点。