发明名称 |
Calibration circuit for VCO |
摘要 |
A phase-locked loop circuit includes an array of selectable capacitors formed within the phase-locked loop circuit to enable the phase-locked loop circuit to provide a degree of coarse frequency control by adding or removing capacitors and a degree of fine frequency control by sinking or sourcing current from a charge pump into a loop filter. A finite state machine is provided within a voltage controlled oscillator calibration circuit that communicates with an external baseband processor to initiate a calibration process, and further to determine how many capacitors of an array of capacitors if formed within the phase-locked loop circuit should be coupled to provide the coarse frequency control.
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申请公布号 |
US2003224747(A1) |
申请公布日期 |
2003.12.04 |
申请号 |
US20020303384 |
申请日期 |
2002.11.25 |
申请人 |
BROADCOM CORPORATION, A CALIFORNIA CORPORATION |
发明人 |
ANAND SEEMA BUTALA |
分类号 |
H03B1/00;H03L7/089;H03L7/099;H03L7/10;H03L7/187;H04B1/30;H04B1/40;(IPC1-7):H04B1/16 |
主分类号 |
H03B1/00 |
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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