发明名称 |
Applying charge pump to realize frequency jitter for switched mode power controller |
摘要 |
Method and apparatus for adding jitter to an oscillator for reducing EMI are disclosed An oscillator circuit includes an oscillator configured to generate a first clock having a first frequency and a frequency jitter circuit including a charge pump configured to charge and discharge first and second capacitors repeatedly for obtaining a time-varying voltage having a second frequency. The time-varying voltage is coupled to the oscillator to vary the first frequency within a frequency range. The charge pump includes a first switch for coupling the first capacitor to a voltage source and a second switch for coupling the first capacitor to the second capacitor. A charge transfer between the first and second capacitors is configured to provide the time-varying voltage. |
申请公布号 |
US8093955(B2) |
申请公布日期 |
2012.01.10 |
申请号 |
US20090547984 |
申请日期 |
2009.08.26 |
申请人 |
YING ZHENG;XU HUANG ZHANG;BCD SEMICONDUCTOR MANUFACTURING LIMITED |
发明人 |
YING ZHENG;XU HUANG ZHANG |
分类号 |
H03K3/26 |
主分类号 |
H03K3/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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