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HMC3716 PFD Lock In Range

Question asked by Des_coghlan on Feb 12, 2017
Latest reply on Feb 17, 2017 by MRichardson

What is the pull in range of the HMC3716 digital phase freq detector? Is it limited to the 10-1300M? The issue is how accurate the initial VCO frequency needs to be. I will use a reference freq of 1000MHz. If the initial VCO freq error means the HMC3716 VCO input is > 1.3GHz, could the PLL fail because the PFD cannot steer the VCO tune voltage correclty?

 

I would prefer that, with the VCO input as high as 2GHz, the HMC3716 acts as a frequency discriminator, steering the loop in the right direction until the VCO input freq drops below 1300MHz, and the phase detector function can act properly. 

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