发明名称 |
DYNAMIC BIASING OF A VCO IN A PHASE-LOCKED LOOP |
摘要 |
A local oscillator includes a phase-locked loop. The phase-locked loop includes voltage controlled oscillator (VCO) and a novel VCO control circuit. The VCO control circuit may be programmable and configurable. In one example, an instruction is received onto the VCO control circuit to change the power state of the VCO. The instruction is issued by other circuitry in response to a detected change in RF channel conditions (for example, a change in a signal-to-noise determination) in a cellular telephone. In response, the VCO control circuit outputs control signals that gradually widen the loop bandwidth of the PLL, then gradually change the VCO bias current to change the VCO power state, and then narrow the loop bandwidth of the PLL back to its original bandwidth. The entire process of widening the PLL bandwidth, changing the VCO power state, and narrowing the PLL bandwidth occurs while the PLL remains locked. |
申请公布号 |
WO2009055622(A3) |
申请公布日期 |
2009.10.01 |
申请号 |
WO2008US81033 |
申请日期 |
2008.10.23 |
申请人 |
QUALCOMM INCORPORATED;SUN, BO;SAHOTA, GURKANWAL SINGH;WU, YUE |
发明人 |
SUN, BO;SAHOTA, GURKANWAL SINGH;WU, YUE |
分类号 |
H03L7/10;H03L7/08;H03L7/093;H03L7/107 |
主分类号 |
H03L7/10 |
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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