Charge-pump folded noise cancelation in fractional-N phase-locked loops
Gaied, David; Hegazi, Emad;
Abstract
In this brief, we propose a technique for Delta-Sigma ΔΣ noise cancelation in fractional-N phase-locked loops (PLLs). The proposed method performs noise cancelation for both the shaped noise generated by the ΔΣ modulator and the downfolded noise due to charge pump (CP) nonlinearity. By precoding the CP control pulses, the added hardware complexity is minimal compared with conventional cancelation, whereas noise reduction is large. The proposed method is verified through the system design of a 2.5-GHz ΔΣ fractional-N PLL. Time-domain simulations show 20-dB noise reduction for the downfolded noise when applying the proposed cancelation. © 2014 IEEE.
Other data
| Title | Charge-pump folded noise cancelation in fractional-N phase-locked loops | Authors | Gaied, David; Hegazi, Emad | Keywords | Charge pump (CP) | Delta-Sigma (ΔΣ) modulation | fractional-N phase-locked loop (PLL) | noise cancelation | phase frequency detector (PFD) | PLL | Issue Date | 1-Jan-2014 | Publisher | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Journal | IEEE Transactions on Circuits and Systems II: Express Briefs | ISSN | 15497747 | DOI | 10.1109/TCSII.2014.2319691 | Scopus ID | 2-s2.0-84903163296 | Web of science ID | WOS:000341574100002 |
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