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HMC439 use as frequency Comaprison

Thread Summary

The user wants to compare two frequencies using the HMC439 and a loop filter without a VCO. The support engineer suggests this is not the intended use and may introduce hysteresis, recommending a mixer or the AD8302 for frequency comparison. The AD8302 can measure phase difference, but the user needs to convert frequency difference to phase difference for accurate measurement.
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Category: Software
Product Number: hmc439

Hi, I want to use HMC439 and Loop Filter to compare two frequencies. I do not want to use VCO. 

The idea is to input two different frequencies to HMC439 then use a loop filter and read the output voltage of loop filter to draw the comparison between the input frequencies.

Can i do it using HMC439 because in doing so, i will not be using VCO and hence loop is not closed.

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