Semiconductor integrated circuit device and wireless communication device
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United States of America Patent
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Feb 5, 2008
Grant Date -
Jul 13, 2006
app pub date -
Dec 15, 2005
filing date -
Dec 17, 2004
priority date (Note) -
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Abstract
A semiconductor integrated circuit device having a voltage controlled oscillation circuit that is capable of sufficient oscillation performance and a wireless communication device having the semiconductor integrated circuit device are disclosed. A difference between the maximum value and the minimum value of the oscillation output signal is automatically controlled to be substantially equal to the first predetermined voltage which is the threshold voltage of the oscillation MOSFET for sufficient phase noise performance. It is further disclosed that the difference between the maximum value and the minimum value of the oscillation output signal may be varied by the change of the threshold voltage of the MOSFET caused by substrate bias effect, while maintaining the sufficient phase noise performance.
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