Storage element, storage device, and signal processing circuit
First Claim
1. A storage element comprising:
- a first storage circuit;
a second storage circuit comprising;
a first capacitor comprising a pair of first electrodes;
a first transistor comprising a first gate, a first source and a first drain; and
a second transistor comprising a second gate, a second source and a second drain;
a first switch comprising a first terminal and a second terminal;
a second switch comprising a third terminal and a fourth terminal; and
a third switch comprising a fifth terminal and a sixth terminal,wherein the first storage circuit holds data only in a period during which a power supply voltage is supplied,wherein the first transistor comprises a channel provided in an oxide semiconductor layer,wherein one of the first source and the first drain is electrically connected to one of the pair of first electrodes and the second gate,wherein one of the second source and the second drain is electrically connected to a first power supply line,wherein the other of the second source and the second drain is electrically connected to the first terminal,wherein the second terminal is electrically connected to the third terminal,wherein the fourth terminal is electrically connected to a second power supply line,wherein a first control signal is input to the first gate,wherein a conduction state or a non-conduction state in each of the first switch and the second switch is selected by a second control signal which is different from the first control signal,wherein when one of the first switch and the second switch is in a conduction state, the other of the first switch and the second switch is in a non-conduction state,wherein a conduction state or a non-conduction state in the third switch is selected by a third control signal which is different from the first control signal and the second control signal,wherein a signal corresponding to data held in the first storage circuit is input to the other of the first source and the first drain, andwherein a signal output from the second terminal or an inverted signal of the signal output from the second terminal is input to the first storage circuit through the third switch.
1 Assignment
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Accused Products
Abstract
A signal processing circuit whose power consumption can be suppressed is provided. In a period during which a power supply voltage is not supplied to a storage element, data stored in a first storage circuit corresponding to a nonvolatile memory can be held by a first capacitor provided in a second storage circuit. With the use of a transistor in which a channel is formed in an oxide semiconductor layer, a signal held in the first capacitor is held for a long time. The storage element can accordingly hold the stored content (data) also in a period during which the supply of the power supply voltage is stopped. A signal held by the first capacitor can be converted into the one corresponding to the state (the on state or off state) of the second transistor and read from the second storage circuit. Consequently, an original signal can be accurately read.
229 Citations
20 Claims
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1. A storage element comprising:
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a first storage circuit; a second storage circuit comprising; a first capacitor comprising a pair of first electrodes; a first transistor comprising a first gate, a first source and a first drain; and a second transistor comprising a second gate, a second source and a second drain; a first switch comprising a first terminal and a second terminal; a second switch comprising a third terminal and a fourth terminal; and a third switch comprising a fifth terminal and a sixth terminal, wherein the first storage circuit holds data only in a period during which a power supply voltage is supplied, wherein the first transistor comprises a channel provided in an oxide semiconductor layer, wherein one of the first source and the first drain is electrically connected to one of the pair of first electrodes and the second gate, wherein one of the second source and the second drain is electrically connected to a first power supply line, wherein the other of the second source and the second drain is electrically connected to the first terminal, wherein the second terminal is electrically connected to the third terminal, wherein the fourth terminal is electrically connected to a second power supply line, wherein a first control signal is input to the first gate, wherein a conduction state or a non-conduction state in each of the first switch and the second switch is selected by a second control signal which is different from the first control signal, wherein when one of the first switch and the second switch is in a conduction state, the other of the first switch and the second switch is in a non-conduction state, wherein a conduction state or a non-conduction state in the third switch is selected by a third control signal which is different from the first control signal and the second control signal, wherein a signal corresponding to data held in the first storage circuit is input to the other of the first source and the first drain, and wherein a signal output from the second terminal or an inverted signal of the signal output from the second terminal is input to the first storage circuit through the third switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A storage element comprising:
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a first storage circuit; a second storage circuit comprising; a first capacitor comprising a pair of first electrodes; a first transistor comprising a first gate, a first source and a first drain; a second transistor comprising a second gate, a second source and a second drain; a first switch comprising a first terminal and a second terminal; a second switch comprising a third terminal and a fourth terminal; a third switch comprising a fifth terminal and a sixth terminal; and an inverter, wherein the first storage circuit holds data only in a period during which a power supply voltage is supplied, wherein the first transistor comprises a channel provided in an oxide semiconductor layer, wherein one of the first source and the first drain is electrically connected to one of the pair of first electrodes and the second gate, wherein one of the second source and the second drain is electrically connected to a first power supply line, wherein the other of the second source and the second drain is electrically connected to the first terminal, wherein the second terminal is electrically connected to the third terminal, wherein the fourth terminal is electrically connected to a second power supply line, wherein the second terminal, the third terminal, and an input terminal of the inverter are electrically connected to each other, wherein a first control signal is input to the first gate, wherein a conduction state or a non-conduction state in each of the first switch and the second switch is selected by a second control signal which is different from the first control signal, wherein when one of the first switch and the second switch is in a conduction state, the other of the first switch and the second switch is in a non-conduction state, wherein a conduction state or a non-conduction state in the third switch is selected by a third control signal which is different from the first control signal and the second control signal, wherein a signal corresponding to data held in the first storage circuit is input to the other of the first source and the first drain, and wherein a signal output from the inverter or an inverted signal of the signal output from the inverter is input to the first storage circuit through the third switch. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A semiconductor device comprising:
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a first transistor; a second transistor, wherein a gate of the first transistor is electrically connected to a gate of the second transistor, a first terminal of the first transistor is electrically connected to a first terminal of the second transistor, and a second terminal of the first transistor is electrically connected to a first voltage source; a third transistor, wherein a first terminal of the third transistor is electrically connected to a second terminal of the second transistor, and a second terminal of the third transistor is electrically connected to a second voltage source; a fourth transistor comprising a channel region, the channel region comprising an oxide semiconductor material, wherein a first terminal of the fourth transistor is electrically connected to a gate of the third transistor; and a first capacitor including a first electrode and a second electrode, wherein the first electrode of the first capacitor is electrically connected to the gate of the third transistor and the first terminal of the fourth transistor, and the second electrode of the first capacitor is electrically connected to the second voltage source. - View Dependent Claims (19, 20)
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Specification