Data holding circuit
First Claim
Patent Images
1. A semiconductor device comprising:
- a first transistor;
a second transistor;
a third transistor;
a capacitor; and
a buffer,wherein one of a source and a drain of the second transistor is electrically connected to an input terminal,wherein the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the third transistor at a first node,wherein the other of the source and the drain of the first transistor is electrically connected to one electrode of the capacitor and an input of the buffer at a second node,wherein the other electrode of the capacitor is electrically connected to a reference voltage terminal,wherein an output of the buffer is electrically connected to an output terminal and the other of the source and the drain of the third transistor, andwherein the first node has a lower capacitance than the capacitor.
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Abstract
A semiconductor device which stores data, and in which refresh operation is not needed, is described. The semiconductor device comprises at least a transistor and a capacitor. A first electrode of the capacitor is connected to a reference voltage terminal and a second electrode of the capacitor is connected to one of a source and a drain of the transistor. The semiconductor device is configured to put, when necessary, the other of the source and the drain of the transistor to the same potential as the one of the source and the drain, so that charge accumulated in the capacitor, which is connected to the one of the source and the drain of the transistor, does not leak through the transistor.
39 Citations
15 Claims
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1. A semiconductor device comprising:
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a first transistor; a second transistor; a third transistor; a capacitor; and a buffer, wherein one of a source and a drain of the second transistor is electrically connected to an input terminal, wherein the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the third transistor at a first node, wherein the other of the source and the drain of the first transistor is electrically connected to one electrode of the capacitor and an input of the buffer at a second node, wherein the other electrode of the capacitor is electrically connected to a reference voltage terminal, wherein an output of the buffer is electrically connected to an output terminal and the other of the source and the drain of the third transistor, and wherein the first node has a lower capacitance than the capacitor. - View Dependent Claims (2, 3)
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4. A semiconductor device comprising:
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an antenna; a rectifier circuit; a logic portion; and a flag holding circuit, wherein the logic portion includes a clock circuit, a logic circuit, a demodulation circuit, and a modulation circuit, wherein the flag holding circuit includes a first transistor, a second transistor, a third transistor, a capacitor, and a buffer, wherein the antenna is connected to the rectifier circuit, wherein the rectifier circuit is connected to the logic portion and the flag holding circuit, wherein a gate of the second transistor is electrically connected to the logic circuit, one of a source and a drain of the second transistor is electrically connected to an input terminal, and the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the third transistor, wherein a gate of the first transistor is electrically connected to the logic circuit, and the other of the source and the drain of the first transistor is electrically connected to one electrode of the capacitor and an input of the buffer, wherein the other electrode of the capacitor is electrically connected to a reference voltage terminal, wherein an output of the buffer is electrically connected to an output terminal and the other of the source and the drain of the third transistor, and wherein a gate of the third transistor is electrically connected to the logic circuit. - View Dependent Claims (5, 6, 7)
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8. A semiconductor device comprising:
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a first transistor; a second transistor; a third transistor; a capacitor; and a buffer, wherein one of a source and a drain of the second transistor is electrically connected to an input terminal, wherein the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the third transistor at a first node, wherein the other of the source and the drain of the first transistor is electrically connected to one electrode of the capacitor and an input of the buffer at a second node, wherein the other electrode of the capacitor is electrically connected to a reference voltage terminal, wherein an output of the buffer is electrically connected to an output terminal and the other of the source and the drain of the third transistor, wherein the semiconductor device is configured so that when the second transistor and the first transistor are turned on, a charge originating from the input terminal is accumulated in the capacitor, and data corresponding to the charge is outputted from the buffer to the output terminal, and when, after the charge is accumulated, the second transistor and the first transistor are turned off and the third transistor is turned on, and an output from the buffer is applied to the one of the source and the drain of the first transistor, the charge is held in the capacitor, and wherein the first node has a lower capacitance than the second node. - View Dependent Claims (9, 10, 11)
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12. A semiconductor device comprising:
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a first transistor; a second transistor; a third transistor; a capacitor; and a buffer, wherein one of a source and a drain of the second transistor is electrically connected to an input terminal, wherein the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the third transistor at a first node, wherein the other of the source and the drain of the first transistor is electrically connected to one electrode of the capacitor and an input of the buffer at a second node, wherein the other electrode of the capacitor is electrically connected to a reference voltage terminal, wherein an output of the buffer is electrically connected to an output terminal and the other of the source and the drain of the third transistor, wherein the semiconductor device is configured so that; when the second transistor and the first transistor are turned on, a charge originating from the input terminal is accumulated in the capacitor, and data corresponding to the charge is outputted from the buffer to the output terminal, and when, after the charge is accumulated, the second transistor and the first transistor are turned off and the third transistor is turned on, and an output from the buffer is applied to the one of the source and the drain of the first transistor, the charge is held in the capacitor, when the second transistor and the first transistor are turned on, the charge accumulated in the capacitor is released to one of the source and the drain of the first transistor, and data corresponding to a low level of the charge is outputted to the output terminal, and when, after the charge is released, the second transistor and the first transistor are turned off and the third transistor is turned on, the output from the buffer is applied to the one of the source and the drain of the first transistor, and wherein the first node has a lower capacitance than the second node. - View Dependent Claims (13, 14, 15)
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Specification