摘要:
One object is to provide a method for measuring current by which minute current can be measured. A value of current flowing through an electrical element is not directly measured but is calculated from change in a potential observed in a predetermined period. The method for measuring current includes the steps of: applying a predetermined potential to a first terminal of an electrical element having the first terminal and a second terminal; measuring an amount of change in a potential of a node connected to the second terminal; and calculating, from the amount of change in the potential, a value of current flowing between the first terminal and the second terminal of the electrical element. Thus, the value of minute current can be measured.
摘要:
One object is to provide a method for measuring current by which minute current can be measured. A value of current flowing through an electrical element is not directly measured but is calculated from change in a potential observed in a predetermined period. The method for measuring current includes the steps of: applying a predetermined potential to a first terminal of an electrical element having the first terminal and a second terminal; measuring an amount of change in a potential of a node connected to the second terminal; and calculating, from the amount of change in the potential, a value of current flowing between the first terminal and the second terminal of the electrical element. Thus, the value of minute current can be measured.
摘要:
A semiconductor device including a first transistor and a second transistor and a capacitor which are over the first transistor is provided. A semiconductor layer of the second transistor includes an offset region. In the second transistor provided with an offset region, the off-state current of the second transistor can be reduced. Thus, a semiconductor device which can hold data for a long time can be provided.
摘要:
A semiconductor device including a first transistor and a second transistor and a capacitor which are over the first transistor is provided. A semiconductor layer of the second transistor includes an offset region. In the second transistor provided with an offset region, the off-state current of the second transistor can be reduced. Thus, a semiconductor device which can hold data for a long time can be provided.
摘要:
A semiconductor device has a non-volatile memory cell including a write transistor which includes an oxide semiconductor and has small leakage current in an off state (off-state current) between a source and a drain, a read transistor including a semiconductor material different from that of the write transistor, and a capacitor. Data is written or to the memory cell by applying a potential to a node where one of a source electrode and drain electrode of the write transistor, one electrode of the capacitor, and a gate electrode of the read transistor are electrically connected to one another so that the predetermined amount of charge is held in the node. The memory window width is changed by 2% or less, before and after 1×109 times of writing.
摘要:
An object is to provide a current measurement method which enables a minute current to be measured. To achieve this, the value of a current flowing through an electrical element is not directly measured, but is calculated from a change in potential observed in a predetermined period. The detection of a minute current can be achieved by a measurement method including the steps of applying a predetermined potential to a first terminal of an electrical element comprising the first terminal and a second terminal; measuring an amount of change in potential of a node connected to the second terminal; and calculating, from the amount of change in potential, a value of a current flowing between the first terminal and the second terminal of the electrical element.
摘要:
An object is to provide a current measurement method which enables a minute current to be measured. To achieve this, the value of a current flowing through an electrical element is not directly measured, but is calculated from a change in potential observed in a predetermined period. The detection of a minute current can be achieved by a measurement method including the steps of applying a predetermined potential to a first terminal of an electrical element comprising the first terminal and a second terminal; measuring an amount of change in potential of a node connected to the second terminal; and calculating, from the amount of change in potential, a value of a current flowing between the first terminal and the second terminal of the electrical element.
摘要:
A semiconductor device has a non-volatile memory cell including a write transistor which includes an oxide semiconductor and has small leakage current in an off state (off-state current) between a source and a drain, a read transistor including a semiconductor material different from that of the write transistor, and a capacitor. Data is written or to the memory cell by applying a potential to a node where one of a source electrode and drain electrode of the write transistor, one electrode of the capacitor, and a gate electrode of the read transistor are electrically connected to one another so that the predetermined amount of charge is held in the node. The memory window width is changed by 2% or less, before and after 1×109 times of writing.
摘要:
An object is to provide a semiconductor memory device capable of copying memory data without using an external circuit. The semiconductor memory device includes a bit line to which first terminals of a plurality of memory cells are connected in common; a pre-charge circuit which is connected to the bit line and pre-charges the bit line with a specific potential in data reading; a data holding circuit comprising a capacitor which temporarily holds data read out from the memory cell or data which is written to the memory cell; and an inverted data output circuit which outputs inverted data of data held in the data holding circuit to the bit line. The inverted data output circuit includes a means for controlling output of inverted data of data held in the data holding circuit.
摘要:
An object is to provide a semiconductor memory device capable of copying memory data without using an external circuit. The semiconductor memory device includes a bit line to which first terminals of a plurality of memory cells are connected in common; a pre-charge circuit which is connected to the bit line and pre-charges the bit line with a specific potential in data reading; a data holding circuit comprising a capacitor which temporarily holds data read out from the memory cell or data which is written to the memory cell; and an inverted data output circuit which outputs inverted data of data held in the data holding circuit to the bit line. The inverted data output circuit includes a means for controlling output of inverted data of data held in the data holding circuit.