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HMC832- frequency sweep

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



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