Semiconductor device and electronic device
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United States of America Patent
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May 12, 2020
Grant Date -
Dec 13, 2018
app pub date -
Jul 26, 2018
filing date -
Oct 30, 2015
priority date (Note) -
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Abstract
An oscillator capable of quick startup is provided. A transistor is provided between an output terminal of a certain stage inverter and an input terminal of the following stage inverter included in the voltage controlled oscillator. With the use of the on resistance of the transistor, the oscillation frequency of the clock signal is controlled. While supply of the power supply voltage is stopped, a signal that is input to the input terminal of the inverter just before supply of the power supply voltage is stopped is stored by turning off the transistor. This operation makes it possible to immediately output a clock signal that has the same frequency as that before supply of the power supply voltage is stopped at the time when the power supply voltage is supplied again.
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