By Topic

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

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

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 )