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how to improve the IBS in fractional PLL ADF4157?

Question asked by fenfei on Nov 19, 2010
Latest reply on Nov 29, 2010 by dawid.powazynski

    I use ADF4157 to design a PLL with frequency range 1GHz~2GHz ,freq step 1kHz,loop filter band width 50kHz.during loop band,the IBS tested is about  -48dBc,How can I improve the IBS in loop band?