发明名称 |
Fractional-N frequency synthesizer with fractional compensation method |
摘要 |
A phase-locked loop (PLL) frequency synthesizer incorporates fractional spur compensation circuitry. This fractional spur compensation circuitry dynamically compensates charge pump ripple whenever a charge pump operates. It can utilize a programmable divider, two phase detectors each using a charge pump stage pumps. A fractional accumulator stage determines the number of charge pumps that operate during a phase comparison. The PLL frequency synthesizer avoids the need for compensation current trimming. Also, fractional compensation is accomplished dynamically and in a manner that is robust to environmental changes.
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申请公布号 |
US6553089(B2) |
申请公布日期 |
2003.04.22 |
申请号 |
US20010940807 |
申请日期 |
2001.08.29 |
申请人 |
GCT SEMICONDUCTOR, INC. |
发明人 |
HUH HYUNGKI;SONG EUNSEOK;LEE KANG YOON;KOO YIDO;LEE JEONGWOO;PARK JOONBAE;LEE KYEONGHO |
分类号 |
H03L7/087;H03L7/089;H03L7/197;(IPC1-7):H03D3/24;H03L2/06 |
主分类号 |
H03L7/087 |
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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