Title:
【発明の名称】電源投入スイッチング過渡電流を減少させる回路を利用する位相ロック・ループを有する周波数シンセサイザ
Document Type and Number:
Japanese Patent JP2003533119
Kind Code:
A
Abstract:
A phase-locked loop synthesizer (8) has a charge pump (9) and a loop filter (22) with a frequency preset capacitor (27). The synthesizer (8) has a transistor (34) of which one main electrode (36) is connected to the frequency preset capacitor. Another main electrode (35) of the transistor (34) is connected to a power-up terminal (32) that is also connected to the charge pump (21). Upon powering up, the transistor (34) causes the frequency preset capacitor (27) to quickly charge before a first pulse of the charge pump (21).
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Inventors:
Jose El Cordoba
Application Number:
JP2001582915A
Publication Date:
November 05, 2003
Filing Date:
May 10, 2001
Export Citation:
Assignee:
Theron France SRS
International Classes:
H03L3/00; H03L7/089; H03L7/093; H03L7/10; H03L7/187; H04B1/26; H04B1/40; H03L7/08; (IPC1-7): H03L7/187; H03L7/093; H03L7/10; H04B1/26; H04B1/40
Attorney, Agent or Firm:
Tadahiko Ito