Semiconductor device
First Claim
1. A semiconductor device comprising:
- a first capacitor;
a second capacitor;
a first transistor; and
a second transistor,wherein one electrode of the first capacitor and one electrode of the second capacitor are electrically connected to each other,wherein the one electrode of the first capacitor is electrically connected to a gate electrode of the second transistor,wherein the one electrode of the second capacitor is electrically connected to one of a source electrode and a drain electrode of the first transistor, andwherein a channel formation region of the first transistor comprises an oxide semiconductor.
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Accused Products
Abstract
As semiconductor devices including semiconductors, logic circuits are given. Logic circuits include dynamic logic circuits and static logic circuits and are formed using transistors and the like. Dynamic logic circuits can store data for a certain period of time. Thus, leakage current from transistors causes more severe problems in dynamic logic circuits than in static logic circuits. A logic circuit includes a first transistor whose off-state current is small and a second transistor whose gate is electrically connected to the first transistor. Electric charge is supplied to a node of the gate of the second transistor through the first transistor. Electric charge is supplied to the node through a first capacitor and a second capacitor. On/off of the second transistor is controlled depending on a state of the electric charge. The first transistor includes an oxide semiconductor in a channel formation region.
124 Citations
30 Claims
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1. A semiconductor device comprising:
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a first capacitor; a second capacitor; a first transistor; and a second transistor, wherein one electrode of the first capacitor and one electrode of the second capacitor are electrically connected to each other, wherein the one electrode of the first capacitor is electrically connected to a gate electrode of the second transistor, wherein the one electrode of the second capacitor is electrically connected to one of a source electrode and a drain electrode of the first transistor, and wherein a channel formation region of the first transistor comprises an oxide semiconductor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor device comprising:
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a first capacitor; a second capacitor; a first transistor; a second transistor; a third transistor; a fourth transistor; and an inverter, wherein one electrode of the first capacitor and one electrode of the second capacitor are electrically connected to each other, wherein the one electrode of the first capacitor is electrically connected to a gate electrode of the second transistor, wherein the one electrode of the second capacitor is electrically connected to one of a source electrode and a drain electrode of the first transistor, wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to one of a source electrode and a drain electrode of the third transistor, and wherein the other of the source electrode and the drain electrode of the third transistor is electrically connected to one of a source electrode and a drain electrode of the fourth transistor and the inverter. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for driving a semiconductor device, the semiconductor device comprising a first capacitor, a second capacitor, a first transistor;
- and a second transistor,
wherein one electrode of the first capacitor and one electrode of the second capacitor are electrically connected to each other, wherein the one electrode of the first capacitor is electrically connected to a gate electrode of the second transistor, and wherein the one electrode of the second capacitor is electrically connected to one of a source electrode and a drain electrode of the first transistor, the method comprising the steps of; turning on the first transistor; turning off the first transistor to hold electric charge of a node electrically connected to the gate electrode of the second transistor; supplying a first signal to the gate electrode of the second transistor through the first capacitor; supplying a second signal to the gate electrode of the second transistor through the second capacitor; and controlling a switching function of the second transistor by the electric charge, the first signal and the second signal. - View Dependent Claims (18, 19, 20, 21)
- and a second transistor,
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22. A method for driving a semiconductor device, the semiconductor device comprising a first capacitor, a second capacitor, a first transistor;
- a second transistor, a third transistor, a fourth transistor and an inverter,
wherein one electrode of the first capacitor and one electrode of the second capacitor are electrically connected to each other, wherein the one electrode of the first capacitor is electrically connected to a gate electrode of the second transistor, wherein the one electrode of the second capacitor is electrically connected to one of a source electrode and a drain electrode of the first transistor, wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to one of a source electrode and a drain electrode of the third transistor, and wherein the other of the source electrode and the drain electrode of the third transistor is electrically connected to one of a source electrode and a drain electrode of the fourth transistor and the inverter, the method comprising the steps of; turning on the first transistor; turning off the first transistor to hold electric charge of a node electrically connected to the gate electrode of the second transistor; supplying a first signal to the gate electrode of the second transistor through the first capacitor; supplying a second signal to the gate electrode of the second transistor through the second capacitor; controlling a switching function of the second transistor by the electric charge, the first signal and the second signal; and outputting a logical operation from the inverter. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
- a second transistor, a third transistor, a fourth transistor and an inverter,
Specification