摘要:
A phase change memory device includes a memory cell having a phase change material, a write driver adapted to supply a program current to the memory cell during a programming interval, and a pump circuit adapted to enhance a current supply capacity of the write driver during the programming interval. The pump circuit is activated prior to the programming interval in response to an external control signal.
摘要:
A nonvolatile memory device includes a bit line, a pair of data lines and a plurality of scalable two transistor memory (STTM) cells. The memory cells are arranged between a pair of datalines so as to share the bit line. The memory device further includes a data line selection circuit and a sense amplification circuit. The data line selection circuit selects one of a pair of data lines, and the sense amplification circuit senses and amplifies a voltage difference between the bit line and the selected data line. Operation speed is increased, while improving device cell array structure.
摘要:
In a method of programming a phase change memory device, write data is programmed in a plurality of phase change memory cells by applying write pulses to each of the plurality of phase change memory cells. Whether each of the phase change memory cells is programmed is verified by applying verification pulses to each of the phase-change memory cells. A number of applications for the verification pulses and the intervals between respective applications of the verification pulses are varied in accordance with a verification result for each of the phase-change memory cells.
摘要:
A magnetic memory device includes a common line; a first write-in diode, a readout diode and a second write-in diode being connected to the common line in parallel. The magnetic memory device further includes a magnetic tunnel junction structure connected to the readout diode, first and second write-in conductors disposed at both sides of the magnetic tunnel junction structure and connected to the first and second write-in diodes, respectively and a first write-in line, a readout line and a second write-in line, which are connected to the first write-in conductor, the magnetic tunnel injection structure, and the second write-in conductor, respectively.
摘要:
A single transistor floating-body dynamic random access memory (DRAM) device includes a floating body located on a semiconductor substrate and a gate electrode located on the floating body, the floating body including an excess carrier storage region. The DRAM device further includes source and drain regions respectively located at both sides of the gate electrode, and leakage shielding patterns located between the floating body and the source and drain regions. Each of the source and drain regions contact the floating body, which may be positioned between the source and drain regions. The floating body may also laterally extend under the leakage shielding patterns, which may be arranged at outer sides of the gate electrode.
摘要:
A phase change memory device includes a memory cell having a phase change material, a write driver adapted to supply a program current to the memory cell during a programming interval, and a pump circuit adapted to enhance a current supply capacity of the write driver during the programming interval. The pump circuit is activated prior to the programming interval in response to an external control signal.
摘要:
A resistance-variable memory device includes memory cells, a high voltage circuit, a precharging circuit, a bias circuit, and a sense amplifier. Each memory cell may, for example, include a resistance-variable material and a diode connected to a bitline. The high voltage circuit provides a high voltage from a power source. The precharging circuit raises the bitline up to the high voltage after charging the bitline up to the power source voltage. The bias circuit supplies a read current to the bitline using the high voltage. The sense amplifier compares a voltage of the bitline with a reference voltage by means of the high voltage.
摘要:
A phase-change random access memory device is provided. The phase-change random access memory device includes a global bit line connected to a write circuit and a read circuit, multiple local bit lines, each being connected to multiple phase-change memory cells, and multiple column select transistors selectively connecting the global bit line with each of the multiple local bit lines, each column select transistor having a resistance that varies depending on its distance from the write circuit and the read circuit.
摘要:
A phase change memory device may include a memory cell array, a write driver, and/or a control unit. The memory cell array may include a plurality of memory cells. The write driver may be configured to provide a program current to the memory cell array for setting a state of a phase change material to program a selected memory cell. The write driver may be configured to provide the program current such that the program current has a plurality of steps. The control unit may be configured to receive step information for adjusting a magnitude and a width of each step of the program current during a test operation and provide the step information to the write driver during a normal operation.
摘要:
There are provided a bias voltage generator, a semiconductor memory device having the bias voltage generator, and a method for generating the bias voltage. The bias voltage generator which generates the bias voltage to control a sensing current supplied to a memory cell for sensing data is characterized in that the bias voltage is output in response to an input voltage being applied, so that a slope of the bias voltage to the input voltage is different in at least two sections divided corresponding to a level of the input voltage.