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HMC833 locking VCO output divider vs VCO

Question asked by jpaden on Aug 10, 2016
Latest reply on Jan 1, 2017 by jpaden

We are generating a 2000 MHz VCO frequency and then dividing by 4 to get 500 MHz. The output is phase locked. However, each time we power up, the 500 MHz signal can take one of four offsets relative to the REFIN because of the divide by 4.  Is there anyway to lock the 500 MHz divided output to the REFIN rather than just the 2000 MHz VCO.  From the datasheet it looks like there is no way to do this, but I wanted to check to be sure.

 

Since we can measure the REFIN to 500 MHz offset using our digital system, it would be nice even if there was a way to skip the output divider until it was aligned.

 

Side note that I do not think matters: Our REF is 10 MHz right now, but we will be changing it to 100 MHz once our parts come in.

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