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Synthesizer Problem

Question asked by ElTono on Jun 22, 2011
Latest reply on Jun 22, 2011 by rbrennan


I am working on a project with a PLL synthesizer (ADF4110) for an FM receiver. There occurred following problem:

For the receiver, the phase noise at a distance of 20 kHz to the  carrier  is the most important parameter to comply with certain  guidelines. This  area is dominated (with correct dimensions of the loop  filter) only by  the VCO (channel spacing 20 kHz). Can the phase noise  be minimized in  this area without changing the VCO? The loop bandwidth is 240 Hz. Reducing the bandwidth has no effect.