发明名称 |
Phase locked loop, semiconductor device, and wireless tag |
摘要 |
An object is to provide a PLL having a wide operating range. Another object is to provide a semiconductor device or a wireless tag which has a wide operating range in a communication distance or temperature by incorporating such a PLL. The semiconductor device or the wireless tag includes a first divider circuit; a second divider circuit; a phase comparator circuit to which an output of the first divider circuit and an output of the second divider circuit are provided; a loop filter to which an output of the phase comparator circuit is supplied and in which a time constant is switched in accordance with an inputted signal; and a voltage controlled oscillator circuit to which an output of the loop filter is supplied and which supplies an output to the second divider circuit.
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申请公布号 |
US7973608(B2) |
申请公布日期 |
2011.07.05 |
申请号 |
US20070979995 |
申请日期 |
2007.11.13 |
申请人 |
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. |
发明人 |
KATO KIYOSHI;MATSUZAKI TAKANORI |
分类号 |
H03L7/085;H03L7/093;H03L7/099;H03L7/18;H04B1/40;H04B1/50;H04B1/54;H04B1/59;H04B7/00 |
主分类号 |
H03L7/085 |
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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