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Folding of Phase Noise Spectra in Charge-Pump Phase-Locked Loops Induced by Frequency Division

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4 Author(s)
Levantino, S. ; Dipt. di Elettron. e Inf., Politec. di Milano, Milan, Italy ; Collamati, L. ; Samori, C. ; Lacaita, A.L.

In charge-pump phase-locked loops (CP-PLLs), the reference signal samples the phase delay between reference and feedback signals. When a frequency divider is present in the loop, the spectrum folding of the voltage-controlled oscillator phase noise caused by the inherent subsampling operation adds a relevant contribution to the in-band output noise. This brief elaborates the discrete-time linear model of PLLs to take into account spectrum folding and provides a simple equation for the estimation of the output noise. The closed-form expressions are validated on the basis of behavioral simulations of a third-order CP-PLL.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:57 ,  Issue: 9 )

Date of Publication:

Sept. 2010

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