Oscillator circuit and semiconductor device including the same
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United States of America Patent
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Aug 22, 2017
Grant Date -
Sep 1, 2016
app pub date -
May 11, 2016
filing date -
Jul 25, 2014
priority date (Note) -
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Abstract
Controllability of an oscillator circuit is improved. The oscillator circuit has inverters in odd-numbered stages. A circuit is electrically connected to a power supply node of the inverters to which a high power supply potential is input. The circuit includes a first transistor, a second transistor, and a capacitor. The first transistor includes an oxide semiconductor in its channel. A holding circuit including the first transistor and the capacitor has a function of holding an analog potential that is input from the outside. The potential held by the holding circuit is input to a gate of the second transistor. A power supply potential is supplied to the inverters through the second transistor, so that the delay time of the inverter can be controlled by the potential of the gate of the second transistor.
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