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?
Please use constant negative bleed.
It is activated by setting DB24 and DB23 in Register 4 to 1.
It should give best effects for charge pump currents greater than 2.5mA.
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