发明授权
- 专利标题: Sigma-delta based phase lock loop
- 专利标题(中): 基于Sigma-delta的锁相环
-
申请号: US11227909申请日: 2005-09-16
-
公开(公告)号: US07535977B2公开(公告)日: 2009-05-19
- 发明人: Yido Koo , Youngho Ahn , Eunseok Song , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
- 申请人: Yido Koo , Youngho Ahn , Eunseok Song , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
- 申请人地址: US CA San Jose
- 专利权人: GCT Semiconductor, Inc.
- 当前专利权人: GCT Semiconductor, Inc.
- 当前专利权人地址: US CA San Jose
- 主分类号: H03D3/18
- IPC分类号: H03D3/18
摘要:
A sigma-delta based phase lock loop device is provided that includes a phase frequency detector (PFD), a charge pump and a voltage controlled oscillator. The PFD to receive a reference signal and a feedback signal and to output signals based on a comparison of the reference signal and the feedback signal. The charge pump to output a charge based on the output signals from the PFD. The charge pump including a first current source to apply a fixed amount of current and a second current source to apply a variable amount of current. The voltage controlled oscillator to output a clock signal based on the received charge from the charge pump.
公开/授权文献
- US20060068737A1 Sigma-delta based phase lock loop 公开/授权日:2006-03-30