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HMC983 as a stand-alone fractional divider for frequency sweeper application

Question asked by liuzhiqiang on Apr 22, 2018

Hi,

 

I have configed HMC983 as a stand-alone fractional divider. Then I want to realize the frequency sweeper function, but it does not work.

I kept the RF input frequency at 3 Ghz,  and test the divided output frequency. I have followed the configuration sequence on page 22 of the datasheet, as shown in the picture. I would like to config the HMC983 in a automatic 2-way sweep mode. But the output frequency does sweep. Do I need to config the TRIGER function?  Is there any other register I have to write? Can you tell me the correct register configuration steps or provide an code example? 

The following is the configuration employed in my design:

 

0x00000FE40F//reg01h
0x101E05F807//reg0Eh


0x00000,0x0F02F//reg05h
0x00000,0x00037//reg06h
0x00000,0x0003F//reg07h

0x101E2,0x5F807//reg0Eh

0x00000,0x00087//reg10h
0x00000,0x1908F//reg11h
0x00000,0x00097//reg12h
0x00001,0x0689F//reg13h
0x00000,0x000A7//reg14h
0x00061,0xA80AF//reg15h

0x00000,0x00037//reg06h
0x00000,0x1903F//reg07h
0x00000,0x000CF//reg19h
0x00001,0x068D7//reg1Ah
0x00000,0x00067//reg0Ch
0x000C3,0x5006F//reg0Dh

 

 

Thank you

 

Look forward for your reply.

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