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Title:
【発明の名称】デュアルモデュラスによるインターリーブを利用したPLLノイズ平滑
Document Type and Number:
Japanese Patent JP2003506909
Kind Code:
A
Abstract:
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.

Inventors:
Thunder Bryan
McCune Earl W. Junior
Application Number:
JP2001513812A
Publication Date:
February 18, 2003
Filing Date:
July 31, 2000
Export Citation:
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Assignee:
Tropian inc
International Classes:
H03K23/66; H03L7/183; H03L7/193; H03L7/197; (IPC1-7): H03L7/183; H03K23/66; H03L7/197
Attorney, Agent or Firm:
Eiichiro Kubota (1 person outside)