Title:
CIRCUIT DEVICE FOR FREQUENCY DIVIDER
Document Type and Number:
Japanese Patent JP3519346
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a low whole frequency division ratio by means of a high frequency division ration in a preceding frequency dividing period and the low frequency division ratio of a main frequency divider by providing a plurality of different frequency division ratios in the preceding frequency divider, arranging a lower-order second advance counter, by which the second frequency division ratio is set at the output side of the preceding frequency division unit and changing-over the frequency division ratio of the preceding frequency divider with another frequency division ratio by means of the counter.
SOLUTION: A main counter M, by which the frequency division ratio M is set, is arranged at the output side of a quadro-modulus pre-scalar, having setting possible frequency division ratios 64/65/80/81. Also swallow counters A1 and A2 in the lower-order of the main counter M, by which the frequency division ratios A1 and A2 are set, are disposed at the output side of the pre- scalar. When each swallow counter A1 or A2 changes-over a 'dual modulus' pre-scalar from one frequency division mode into the other frequency division mode, the frequency division ratios M, A1 and A2 are adjusted effectively. Thus, the whole frequency division ratio N of each is obtained without interruption.
Inventors:
Heinen, Stefan
Application Number:
JP2000196983A
Publication Date:
April 12, 2004
Filing Date:
June 29, 2000
Export Citation:
Assignee:
INFINEON TECHNOLOGIES AG
International Classes:
H03K23/66; H03K23/64; H03L7/193; (IPC1-7): H03K23/64
Attorney, Agent or Firm:
矢野 敏雄 （外４名）
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