Title:
広帯域同調回路
Document Type and Number:
Japanese Patent JP2008533839
Kind Code:
A
Abstract:
Some embodiments provide an oscillator that produces a signal at a desired frequency for use in a tuner. The oscillator comprises a filter and a frequency divider circuit comprising one or more frequency dividers in sequence, each frequency divider reducing a received frequency by a predetermined proportion. The frequency of the oscillator is controlled by a tuning code comprising a fine tuning code applied to the filter and a coarse tuning code applied to the frequency divider circuit. The filter is used to produce an initial frequency according to the fine tuning code and the frequency divider circuit divides down the initial frequency according to the coarse tuning code to produce a final frequency of the oscillator. Some embodiments provide an automated method and apparatus for tuning the oscillator to produce a signal at a desired frequency where the coarse tuning code is determined before the fine tuning code.
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Inventors:
Takatsugu Kamada
Application Number:
JP2008500931A
Publication Date:
August 21, 2008
Filing Date:
March 10, 2006
Export Citation:
Assignee:
Rfstream inc.
RF Stream USA, Inc.
RF Stream USA, Inc.
International Classes:
H04B1/26; H03B19/12
Attorney, Agent or Firm:
Kazunori Saito
Tetsuya Ito
Tetsuya Ito