摘要:
A semiconductor device includes a plurality of memory cells including a first transistor and a second transistor, a reading circuit including an amplifier circuit and a switch element, and a refresh control circuit. A first channel formation region and a second channel formation region contain different materials as their respective main components. A first gate electrode is electrically connected to one of a second source electrode and a second drain electrode. The other of the second source electrode and the second drain electrode is electrically connected to one of input terminals of the amplifier circuit. An output terminal of the amplifier circuit is connected to the other of the second source electrode and the second drain electrode through the switch element. The refresh control circuit is configured to control whether the switch element is turned on or off.
摘要:
A semiconductor memory device or a semiconductor device which has high reading accuracy is provided. A bit line, a word line, a memory cell placed in an intersection portion of the bit line and the word line, and a reading circuit electrically connected to the bit line are provided. The memory cell includes a first transistor and an antifuse. The reading circuit includes a pre-charge circuit, a clocked inverter, and a switch. The pre-charge circuit includes a second transistor and a NAND circuit. The semiconductor memory device includes transistor in each of which an oxide semiconductor is used in a channel formation region, as the first transistor and the second transistor.
摘要:
An object of the present invention is to provide a highly reliable power supply device which can withstand long-term use. Another object of the present invention is to provide a power supply device with reduced power consumption. The power supply device includes a cell including an antenna and a switch and performing position detection operation and power feeding operation; a high-frequency wave supply circuit; a switch control circuit; and a potential detecting circuit. One electrode of the antenna is connected to the high-frequency wave supply circuit through the switch, and the other thereof is connected to the potential detecting circuit. By the position detection operation, whether there is a power receiving device which gets close to a cell or not is detected. Only when the power receiving device is detected, power is supplied by the power feeding operation.
摘要:
As for a “system on panel” in which a control circuit and a driver circuit as well as a display device are integrally formed over a substrate such as a glass substrate, more sophistication is expected by fabricating an input unit over the same substrate. Input of a semiconductor device is generally performed by pushing or touching a button like input unit with fingers or the like. In that case, glass is often used for a counter substrate; however, it is difficult to form a button from glass and to provide it directly on the substrate due to the nature of the material. It is an object of the present invention to provide a semiconductor device at a lower price, in which the input operation can be performed without employing an external input unit.A variable capacitor is formed from a pair of electrodes and a dielectric interposed between the electrodes over a substrate, and an external input is detected by changing capacitance of the variable capacitor by a physical or electrical force. Specifically, a variable capacitor and a sense amplifier are provided over the same substrate, and the sense amplifier reads the change of capacitance of the variable capacitor and transmits a signal in accordance with the input to a control circuit.
摘要:
A structure of a storage device which can operate memory elements utilizing silicide reaction using the same voltage value for writing and for reading, and a method for driving the same are proposed. The present invention relates to a storage device including a memory element and a circuit which changes a polarity of applying voltage to the memory element for writing (or reading) into a different polarity of that for reading (or writing). The memory element includes at least a first conductive layer, a film including silicon formed over the first conductive layer, and a second conductive layer formed over the silicon film. The first conductive layer and the second conductive layer of the memory element are formed using different materials.
摘要:
An object of the present invention is to provide a semiconductor device which can obtain the high potential necessary for writing data to a memory, using a small circuit area. In the present invention, by using as input voltage of a booster circuit not the conventionally used output VDD of a regulator circuit 104, but rather an output VDD0 of a rectifier circuit portion 103, which is a higher potential than the VDD, the high potential necessary for writing data to a memory can be obtained with a small circuit area.
摘要:
A pulse converter circuit includes a logic circuit to which a first signal is input and from which a second signal is output. The logic circuit includes a p-channel transistor which determines whether a voltage of the second signal is set to a first voltage depending on a voltage of the gate; and an n-channel transistor which determines whether the voltage of the second signal is set to a second voltage, which is higher than the first voltage, depending on a voltage of the gate. The p-channel transistor includes a semiconductor layer containing an element of a group 14. The n-channel transistor includes an oxide semiconductor layer.
摘要:
When writing into an antifuse memory element finishes, a value of resistance of the memory element rapidly decreases; accordingly, an output voltage of a boosting circuit which produces a writing voltage rapidly decreases. By detecting a change in the output voltage of the boosting circuit to control a writing command, the writing operation can be stopped immediately after the memory element is shorted. Thus, unnecessary current consumption caused by continuing a writing operation on the shorted memory element can be suppressed.
摘要:
The semiconductor device includes the read circuit which reads data written to a memory cell. The read circuit includes a first transistor, a second transistor, a first switch, and a second switch. A first terminal of the first transistor is electrically connected to a gate of the first transistor, and a second terminal of the first transistor is electrically connected to an output from the read circuit via the first switch. A first terminal of the second transistor is electrically connected to a gate of the second transistor, and a second terminal of the second transistor is electrically connected to the output from the read circuit via the second switch. A channel formation region of the first transistor can be formed using an oxide semiconductor, and a channel formation region of the second transistor can be formed using silicon.
摘要:
It is an object to reduce defects caused by reading wrong data by judging whether a storage state held in a non-volatile memory element is correct or not in the case where accumulation or discharge of electrons in/from a charge accumulation layer.A semiconductor memory circuit including a memory cell region and a test region and a control circuit are included in a semiconductor device of the present invention. In the control circuit, a first operation is performed for writing data to a memory cell, and writing a first storage state to a first region or writing a second storage state to a second region. Then, a second operation is performed for reading a first storage state or a second storage state from a first region and a second region. Further, a third operation is performed for reading data from the memory cell. Whether the third operation is correctly performed or not is judged in accordance with whether the first storage state is read from the first region or not or whether the second storage state is read from the second region or not in the second operation.