发明授权
- 专利标题: System and method for crystal oscillator frequency tuning
- 专利标题(中): 晶体振荡器频率调谐的系统和方法
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申请号: US12879525申请日: 2010-09-10
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公开(公告)号: US08138844B1公开(公告)日: 2012-03-20
- 发明人: John Simmons , Kristopher Kaufman
- 申请人: John Simmons , Kristopher Kaufman
- 申请人地址: JP Kanagawa
- 专利权人: Fujitsu Semiconductor Limited
- 当前专利权人: Fujitsu Semiconductor Limited
- 当前专利权人地址: JP Kanagawa
- 代理机构: Baker Botts L.L.P.
- 主分类号: H03B5/32
- IPC分类号: H03B5/32
摘要:
An oscillator may include a crystal resonator, an inverter coupled in parallel with the crystal resonator, a first switched capacitor coupled to a first terminal of the crystal resonator, a second switched capacitor coupled to a second terminal of the crystal resonator, a control module configured to output a periodic dithering signal, the periodic dithering signal having a first pulse width based on a desired frequency of oscillation for the oscillator, and a delay module configured to communicate a first periodic enable signal to enable the first switched capacitor and a second periodic enable signal to enable the second switched capacitor. At least one of the first periodic enable signal and the second periodic enable signal may have a second pulse width greater than the first pulse width. The second periodic enable signal may be phase delayed relative to the first periodic enable signal by a non-zero delay.
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