Title:
周波数シンセサイザ、リップルを補償する方法
Document Type and Number:
Japanese Patent JP4198833
Kind Code:
B2
Abstract:
A frequency synthesizer that can accurately compensate for ripple current. The frequency synthesizer 1 having a PLL loop containing an oscillator 31 and a charge pump circuit 35 has a detector circuit 40 and a delay circuit 39. The detector circuit 40, by detecting a ripple current with a superimposed compensating current, detects the time difference between the output time of the compensating current and the output time of the ripple current, and since the delay circuit 39 delays one or both of the output time of the compensating current and the output time of the ripple current based on that detection result, the time difference for the output times can be made small, and if a compensating current is supplied that is equal to the ripple current, it becomes possible to accurately remove the ripple current.
Inventors:
Kozo Ichimaru
Application Number:
JP20848899A
Publication Date:
December 17, 2008
Filing Date:
July 23, 1999
Export Citation:
Assignee:
Texas Instruments Japan Ltd.
International Classes:
H03L7/093; H03L7/081; H03L7/197
Domestic Patent References:
| JP11195984A | ||||
| JP10093432A | ||||
| JP8505993A |
Foreign References:
| WO1995012243A1 |
Attorney, Agent or Firm:
Shigeo Ishijima
Hideki Abe
Hideki Abe
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