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Analysis of Phase Noise in Phase/Frequency Detectors

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2 Author(s)
Homayoun, A. ; Electr. Eng. Dept., Univ. of California at Los Angeles, Los Angeles, CA, USA ; Razavi, B.

The phase noise of phase/frequency detectors can significantly raise the in-band phase noise of frequency synthesizers, corrupting the modulated signal. This paper analyzes the phase noise mechanisms in CMOS phase/frequency detectors and applies the results to two different topologies. It is shown that an octave increase in the input frequency raises the phase noise by 6 dB if flicker noise is dominant and by 3 dB if white noise is dominant. An optimization methodology is also proposed that lowers the phase noise by 4 to 8 dB for a given power consumption. Simulation and analytical results agree to within 3.1 dB for the two topologies at different frequencies.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:60 ,  Issue: 3 )