发明申请
US20040017263A1 Phase-locked loop oscillator with counter bypass 有权
带旁路的锁相环振荡器

  • 专利标题: Phase-locked loop oscillator with counter bypass
  • 专利标题(中): 带旁路的锁相环振荡器
  • 申请号: US10207575
    申请日: 2002-07-29
  • 公开(公告)号: US20040017263A1
    公开(公告)日: 2004-01-29
  • 发明人: Darrell Livezey
  • 主分类号: H03B005/32
  • IPC分类号: H03B005/32
Phase-locked loop oscillator with counter bypass
摘要:
A phase-locked loop circuit includes one loop for regulating phase of a VCO with respect to a reference source. In another loop, VCO frequency is compared to frequency of a crystal oscillator. Digital counters divide the frequency of the crystal oscillator and VCO to a common reference frequency. Once the frequency loop is locked, the counter at the output of the crystal oscillator is bypassed. The counter is bypassed by a flip-flop circuit clocked by the crystal oscillator and receiving a scaled input from the VCO. While the VCO frequency error is in the frequency range of correction capability of the phase-locked loop, the output of the flip-flop will duplicate the output of the counter. Thus, the counter can be bypassed and shut off.
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