发明申请
US20070075787A1 Frequency synthesizer with improved spurious performance 有权
具有改善杂散性能的频率合成器

  • 专利标题: Frequency synthesizer with improved spurious performance
  • 专利标题(中): 具有改善杂散性能的频率合成器
  • 申请号: US11242432
    申请日: 2005-09-30
  • 公开(公告)号: US20070075787A1
    公开(公告)日: 2007-04-05
  • 发明人: Henrik Jensen
  • 申请人: Henrik Jensen
  • 主分类号: H03L7/00
  • IPC分类号: H03L7/00
Frequency synthesizer with improved spurious performance
摘要:
A loop filter for use in a frequency synthesizer provides improved spurious performance using switched capacitors. The loop filter includes a first switched capacitor having a first capacitance value and which is operable to charge to a first voltage corresponding to a current pulse indicative of a difference in phase or frequency between a reference signal and a feedback signal. The loop filter further includes a second switched capacitor having a second capacitance value and which is operable to charge to a second voltage from the first voltage and produce a control voltage based upon the second voltage. The loop filter has a bandwidth determined by a ratio of the second capacitance value to the first capacitance value.
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