Patent number 8649228 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "Embodiments of the inventive concept relate generally to integrated circuit technologies. More particularly, embodiments of the inventive concept relate to output drivers that can be used in various types of integrated circuits such as computing systems and memory systems.
"An output driver is a circuit used to transmit one or more output signals from one electronic device (e.g., an integrated circuit) to another. For example, an output driver can be used to transmit output data from a semiconductor memory device to a memory controller or a processor.
"In many modern devices, output drivers are used to transmit data at high frequencies. However, high frequency data transmissions tend to be more susceptible to noise and distortion compared with lower frequency data transmissions. Accordingly, as data transmission speeds continue to increase, new techniques may be required to maintain reliability in signals transmitted by output drivers."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "According to one embodiment of the inventive concept, an output driver comprises a pull-up circuit that pulls an output node up to a supply voltage in N successive intervals in response to N pull-up control signals having different phases, and a pull-down circuit that pulls the output node down to a ground voltage in M successive intervals in response to M pull-down control signals having different phases.
"According to another embodiment of the inventive concept, an output driver comprises a plurality of driver cells, and a plurality of pre-drivers connected to the plurality of driver cells and configured to control the plurality of driver cells to operate in succession. Each of the plurality of driver cells comprises a pull-up circuit pulling-up an output node to a supply voltage in N successive intervals in response to N pull-up control signals having different phases, and a pull-down circuit pulling-down the output node to a ground voltage in M successive intervals in response to M pull-down control signals having different phases.
"According to still another embodiment of the inventive concept, an electronic system comprises a memory device that generates a first data strobe signal, and a memory controller that receives the first data strobe signal and transmits data to the memory device in synchronization with the data strobe signal. The memory controller comprises a delay locked loop that phase-shifts the first data strobe signal by 90.degree. to generate a second data strobe signal, and an output driver having an output node that receives the data, transmits the data to an output node, and connects the output node to a supply voltage during each of N successive intervals determined by the phase difference between the first and second data strobe signals, and further connects the output node to a ground voltage during each of M successive intervals determined by the phase difference between the first and second data strobe signals.
"These and other embodiments of the inventive concept can reduce the amount of noise in data signals generated at an output node of an output driver. This can improve the reliability of signals transmitted by the output driver, such as signals transmitted at relatively high frequencies."
URL and more information on this patent, see: Koo,
Keywords for this news article include: Data Transmission,
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