摘要:
A semiconductor memory device having a circuit precharging a data line comprises a first precharge circuit, which precharges a first data line pair to a first voltage level in a precharge operation state, and a second precharge circuit, which precharges a second data line pair to a second voltage level in a precharge operation state. The semiconductor memory device comprises a data input driver, which receives data and drives the data to the first data line pair, a switch, which in response to a selection signal, connects or disconnects the first data line pair with the second data line pair, and a charge-sharing control circuit, which in response to the selection signal makes one line of the first data line pair and one line of the second data line pair share charge. The semiconductor memory device reduces current consumption over repeated write/precharge operations.
摘要:
Provided are a reference current generating method and a current reference circuit. The reference current generating method includes generating a first current using a NMOS transistor and a second current using a PMOS transistor, calculating a current difference between the first and second currents, generating a third current which has a similar current/temperature slope as the second current by multiplying the current difference by a proportional constant, and generating a reference current by subtracting the third current from the second current.
摘要:
Provided are a reference current generating method and a current reference circuit. The reference current generating method includes generating a first current using a NMOS transistor and a second current using a PMOS transistor, calculating a current difference between the first and second currents, generating a third current which has a similar current/temperature slope as the second current by multiplying the current difference by a proportional constant, and generating a reference current by subtracting the third current from the second current.
摘要:
A voltage stabilizer circuit for alternately or simultaneously stabilizing first and second generated voltages includes shared capacitor connected between the first and second generated voltages. The voltage stabilizer circuit may further include first and second switches for alternately connecting the first and second electrode of the shared capacitor to a ground. The alternation of the stabilized first and second voltages output by the voltage stabilizer circuit can be synchronized with a pixel polarity inversion mode signal output by the internal driver circuit of an LCD display.
摘要:
A method and apparatus for generating gradation voltages are provided. Maximum and minimum reference voltages are selected from a distribution of voltages ranging from a first source voltage to a second source voltage. The maximum reference voltage is selected as a 1st gradation voltage and the minimum reference voltage is selected as an Nth gradation voltage, or vice versa, in response to an inversion control signal, where N is a natural number. First to Mth gamma voltages are selected from among a plurality of voltages generated by a voltage distribution between the 1st gradation voltage and the Nth gradation voltage. Second to (N−1)th gradation voltages are generated from a voltage distribution between the 1st gradation voltage and the Nth gradation voltage, using the 1st gamma voltage to the Mth gamma voltage, where M is a natural number.
摘要:
A liquid crystal display (LCD) that includes a plurality of pixels, a switch unit, and a gate line driving unit. Each of the pixels includes a liquid crystal capacitor having a pixel electrode and a common electrode, and the pixels are located at intersections of a plurality of gate lines and a plurality of source lines. The switch unit applies source line driving voltages having levels opposite to a common voltage applied to the common electrode, to the source lines. The gate line driving unit sequentially outputs via gate lines gate line driving voltages to control the source line driving voltages to be applied to the pixel electrodes of the pixels. The common voltage transits from a first level to a second level or vice versa at the boundary between a first half frame and a second half frame. At the first half frame, the switch unit applies the source line driving voltages to only odd-numbered source lines. At the second half frame, the switch unit applies the source line driving voltage to only even-numbered source lines.
摘要:
Provided is a multi-path input buffer circuit, which passes a signal input to a semiconductor device through different paths in consideration of the voltage level of the input signal. The multi-path input buffer circuit includes an input buffer stage, which can be driven using one of at least two power supply voltages, outputs path signals by passing an input signal through at least two paths, selects and enables one of the path signals in response to a plurality of path selection signals, and maintains the rest of the path signals in a high impedance state. The buffer circuit also includes a level shifter, which shifts the voltage level of a signal output from the input buffer stage via the first path, and a first logic operation circuit, which operates in response to the output signal of the input buffer stage and a signal output from the level shifter.
摘要:
A method of automatically recovering bit values of a control register includes storing command data inputted from a host in the control register and a portion of a graphic RAM (GRAM), and while a scanning operation is performed by the GRAM, outputting the command data stored in the GRAM to the control register and refreshing the control register.
摘要:
A semiconductor memory device having a more stable input/output (I/O) line sensing control scheme regardless of variation of a threshold voltage and a sensing control method thereof. The semiconductor memory device includes a control circuit that controls a pair of switch transistors which are connected between a pair of I/O lines and a pair of data lines. The control circuit may generate a control signal that turns on one switch transistor while turning off the other switch transistor, and varies the voltage level of the control signal according to variation of the threshold voltage of the switch transistors. As a result, when the threshold voltages of the switch transistors vary according to a manufacturing process, the voltage level of the control signal varies with the variation of the threshold voltages so as to turn on only one switch transistor during a sensing operation, thereby performing a more stable sensing operation.
摘要:
A nonvolatile memory device includes a substrate, a channel layer protruding from the substrate, a gate conductive layer surrounding the channel layer, a gate insulating layer disposed between the channel layer and the gate conductive layer, and a first insulating layer spaced apart from the channel layer and disposed on the top and bottom of the gate conductive layer. The gate insulating layer extends between the gate conductive layer and the first insulating layer.