发明名称 |
SEMICONDUCTOR DEVICE AND WIRELESS COMMUNICATION SYSTEM |
摘要 |
The present invention provides a structure in which an amplitude-modulation mode and a frequency-modulation mode are switched. A semiconductor device of the invention has: a reset control circuit to which a modulation mode select signal which selects an amplitude-modulation mode or a frequency-modulation mode and Manchester-encoded information are input, which outputs a first reset signal and a second reset signal; a first frequency-dividing circuit to which a carrier wave is input, which outputs a sub-carrier wave responding to the amplitude-modulation mode or a frequency-modulation signal responding to the frequency-modulation mode, according to the first reset signal; a second frequency-dividing circuit which outputs a basic clock of which a duty ratio is different between the amplitude-modulation mode and the frequency-modulation mode, according to the second reset signal and an output of the first frequency-dividing circuit; and an ASK/FSK switching portion to which an output from the first frequency-dividing circuit and Manchester-encoded information are input, which outputs an amplitude-modulation signal or a frequency-modulation signal according to the modulation mode select signal.
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申请公布号 |
WO2007018162(A1) |
申请公布日期 |
2007.02.15 |
申请号 |
WO2006JP315542 |
申请日期 |
2006.07.31 |
申请人 |
SEMICONDUCTOR ENERGY LABORATORY CO., LTD.;KOBAYASHI, HIDETOMO;ATSUMI, TOMOAKI |
发明人 |
KOBAYASHI, HIDETOMO;ATSUMI, TOMOAKI |
分类号 |
H04L27/04;G06K19/00;H04B1/59;H04B5/02;H04L27/12 |
主分类号 |
H04L27/04 |
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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