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HMC832- frequency sweep

Question asked by KSPARK on Nov 23, 2015
Latest reply on Nov 30, 2015 by dyoung1

Hello,

 

I made a prototype with a HMC832 to generate a 2199.999999 MHz signal.

 

But the PLL doesn't lock. The signal sweeps.

 

I attached the output signal and the cp signal.

RF_out.pngoutput of CP.png

     (1) RF output signal                                                   (2) charge pump output signal                                             

 

The schematic of my prototype is almost same with ev_board. 

I have a loop filter same evaluation board.

 

I set register map refer to ev_board example files(hmc832_fracfb_Low_I).

Some frequencies was locked. But almost frequencies did not is locked.

 

Thanks in advance for your help.

 

Best Regards

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