发明授权
- 专利标题: Semiconductor device with dynamically calibrated oscillator
- 专利标题(中): 具有动态校准振荡器的半导体器件
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申请号: US13026245申请日: 2011-02-12
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公开(公告)号: US08547148B2公开(公告)日: 2013-10-01
- 发明人: Akira Matsumoto , Tatsunori Usugi
- 申请人: Akira Matsumoto , Tatsunori Usugi
- 申请人地址: JP Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Miles & Stockbridge P.C.
- 优先权: JP2010-074762 20100329
- 主分类号: H03L7/06
- IPC分类号: H03L7/06
摘要:
A digital compensation phase locked loop circuit of a semiconductor device includes a phase locked loop circuit including a voltage controlled oscillator having capacitors at oscillation nodes and consecutively controlled by an applied voltage, and a digital compensation circuit which variably controls the capacitors at the oscillation nodes of the voltage controlled oscillator in accordance with an input phase difference. A gain of the conventional voltage controlled oscillator whose gain is determined by an applied voltage is discretely changed by a control signal of the digital compensation circuit. The digital compensation circuit dynamically controls the gain so as to secure the optimum phase margin by applying a load (capacitor) to the oscillation node of the voltage controlled oscillator with respect to a phase lead and decreasing the load (capacitor) with respect to a phase delay.
公开/授权文献
- US20110234274A1 SEMICONDUCTOR DEVICE 公开/授权日:2011-09-29
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