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Questions about ADF4158 driving BGT24MTR12

Question asked by ForestChaim on May 24, 2017
Latest reply on Oct 24, 2017 by dyoung1

Dear Sir,

question1:    

  I use ADF4158 driving BGT24MTR12 ,I config the software to signle tone,but the spectrum is like about the photo,the single tone BW is 10MHz,I don't think that is right,the hardware is this:

ref=16MHz,double to 32MHz to fPFD

BGT24MTR12 dev of 24GHz is 24GHz/16=1.5GHz

that is:rfin=1.5GHz,so I set N=46,that output is 326086956.5Hz is about 32MHz,FRAC_12_bit=3704;

the PLL can work,but not well,freq is not good.

question2:

I want to use FMCW wave,I set CLK1_DIVIDER_12_BIT = 320;CLK2_DIVIDER_12BIT =1;CLK_DIV_MODE =3;

DEV_OFFSET_WORD_4BIT =3;DEVIATION_WORD_16BIT =20972;STEP_WORD_20BIT =200;

but it doesn't work,it stay single tone,how can I config the reg?

Thanks

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