发明授权
- 专利标题: Method and system for compensation of frequency pulling in an all digital phase lock loop
- 专利标题(中): 全数字锁相环频率补偿补偿方法及系统
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申请号: US12838820申请日: 2010-07-19
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公开(公告)号: US08193870B2公开(公告)日: 2012-06-05
- 发明人: Koji Takinami , Richard Strandberg , Paul Cheng-Po Liang
- 申请人: Koji Takinami , Richard Strandberg , Paul Cheng-Po Liang
- 申请人地址: JP Osaka
- 专利权人: Panasonic Corporation
- 当前专利权人: Panasonic Corporation
- 当前专利权人地址: JP Osaka
- 主分类号: H03B7/12
- IPC分类号: H03B7/12
摘要:
The present invention is a method and system for compensation of frequency pulling in an all digital phase lock loop. The all digital phase lock loop can utilize a multi-phase oscillator including latches with substantially all of the latches paired with a corresponding dummy cell. The dummy cells can have impedance characteristics, such as variable capacitance values which correspond to the variable capacitance value of the latches such that the sum of the two variable capacitance values remains substantially constant, even when the polarity of the reference clock signal changes. The dummy cells can be, for example, variable capacitors or dummy latches. The phase lock loop can also include a multiplying unit. The multiplying unit can receive a reference clock signal and generate a frequency multiplied reference clock signal.
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