Title:
チャージポンプを備えた低電力で不感帯のない位相周波数検知器
Document Type and Number:
Japanese Patent JP4781595
Kind Code:
B2
Abstract:
In a frequency synthesizer with a phase locked loop a charge pump (2) is present with an idle path (5-C, 6-C, 7, 8). The idle path (5-C, 6-C, 7, 8) is activated only shortly before an up or down pulse appears at an output (15, 16) of a phase frequency detector (1) and the idle path (5-C, 6-C, 7, 8) is disabled shortly after the disappearance of an up or down signal. Means (20) to generate a signal for controlling the enablement and disablement of the idle path (5-C, 6-C, 7, 8) may comprise a down-counter divider (30) or a zipper divider (35).
Inventors:
Matthias, Launcher
Application Number:
JP2001567132A
Publication Date:
September 28, 2011
Filing Date:
March 05, 2001
Export Citation:
Assignee:
DSP, Group, Switzerland, Akchen Gesell Shaft
International Classes:
H03L7/093; H03L7/089; H03L7/191; H03L7/08
Domestic Patent References:
| JPH06216767A | 1994-08-05 |
Foreign References:
| WO1999017450A1 | 1999-04-08 | |||
| US5532636A | 1996-07-02 | |||
| US5945855A | 1999-08-31 |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Hidetoshi Tachibana
Takeshi Sekine
Takahashi