EP 1201034 A1 20020502 - PLL NOISE SMOOTHING USING DUAL-MODULUS INTERLEAVING
Title (en)
PLL NOISE SMOOTHING USING DUAL-MODULUS INTERLEAVING
Title (de)
PLL RAUSCHGLÄTTUNG MIT ZWEI-MODULUS VERSCHACHTELUNG
Title (fr)
LISSAGE DU BRUIT DANS UNE BOUCLE A PHASE ASSERVIE A L'AIDE DE L'ENTRELACEMENT A DOUBLE MODULE
Publication
Application
Priority
- US 0020749 W 20000731
- US 36267099 A 19990729
Abstract (en)
[origin: WO0110028A1] The present invention, generally spreading, achieves noise spreading within a PLL using a dual-modulus prescaler by interleaving the division moduli. Within a given cycle, "ones" and "tens" are not all counted consecutively. Instead, ones and tens are interleaved. In one embodiment of the invention, the R count is doubled and the output of the R counter is toggled between high and low states. (The Q counter may remain unmodified). In another embodiment of the invention, ones and tens are interleaved in accordance with a ratio q:r. By so interleaving the modulus, the effect is to spread the noise resulting from the output signal of the dual-modulus prescaler over a wider frequency range. The prescaler noise level is greatly reduced, particularly within the frequency band of the reference frequency.
IPC 1-7
IPC 8 full level
H03K 23/66 (2006.01); H03L 7/183 (2006.01); H03L 7/193 (2006.01); H03L 7/197 (2006.01)
CPC (source: EP KR)
H03K 23/667 (2013.01 - EP); H03L 7/08 (2013.01 - KR); H03L 7/193 (2013.01 - EP)
Citation (search report)
See references of WO 0110028A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0110028 A1 20010208; AU 6503000 A 20010219; CN 1207845 C 20050622; CN 1371549 A 20020925; CN 1667955 A 20050914; EP 1201034 A1 20020502; JP 2003506909 A 20030218; KR 20020019582 A 20020312
DOCDB simple family (application)
US 0020749 W 20000731; AU 6503000 A 20000731; CN 00812059 A 20000731; CN 200510066982 A 20000731; EP 00952306 A 20000731; JP 2001513812 A 20000731; KR 20027001156 A 20020128