Apparatus for canceling intersymbol interference in semiconductor memory device and method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorWon-Ju Lee
Life of this patent
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Abstract
We provide an ISI canceling circuit including a storing unit to store an ISI value associated with a received signal, an operator to generate an operator output signal by subtracting the ISI value from the received signal, and a comparator to manipulate the operator output signal responsive to an operating mode. We also provide a method for canceling ISI that includes storing a base voltage value of the received signal, sequentially storing ISI values of the received signal at time points when ISI is desired to be canceled, generating a difference between each of the stored ISI values and the stored base voltage value, and amplifying the subtracted signal to determine its logic state.
Claims21
An Inter Symbol Interference (ISI) canceling circuit, comprising:
- a storing unit to store an ISI value associated with a received signal, where the storing unit includes:
- a first storing unit to store a base voltage value corresponding to the received signal;
- and
- at least one second storing unit to store ISI values corresponding to the received signal;
- an operator to generate an operator output signal by subtracting the ISI value from the received signal;
- and
- a comparator to manipulate the operator output signal responsive to an operating mode,
- where the comparator is configured to provide the operator output signal to the storing unit in a training mode, and
- where the comparator is configured to output the operator output signal in a normal mode.
An Inter Symbol Interference (ISI) canceling circuit, comprising:
- a storing unit to store an ISI value associated with a received signal, where the storing unit includes:
- an up/down counter to count an operator output signal;
- and
- a digital-analog converter to convert the counted output signal to an analog signal;
- an operator to generate the operator output signal by subtracting the ISI value from the received signal;
- and
- a comparator to manipulate the operator output signal responsive to an operating mode,
- where the comparator is configured to provide the operator output signal to the storing unit in a training mode,
- where the comparator is configured to output the operator output signal in a normal mode, and
- where the up/down counter and the digital-analog converter are configured to operate at a frequency of (data transmission frequency)/(quantity of storing units).
An Inter Symbol Interference (ISI) canceling circuit, comprising:
- a storing unit to store an ISI value associated with a received signal, where the storing unit includes:
- a first storing unit to store a base voltage value corresponding to the received signal;
- and
- at least one second storing unit to store ISI values corresponding to the received signal;
- an operator to generate an operator output signal by subtracting the ISI value from the received signal;
- and
- a comparator to manipulate the operator output signal responsive to an operating mode.
An Inter Symbol Interference (ISI) canceling circuit, comprising:
- a storing unit to store an ISI value associated with a received signal, where the storing unit includes:
- an up/down counter to count an operator output signal;
- and
- a digital-analog converter to convert the counted output signal to an analog signal;
- an operator to generate the operator output signal by subtracting the ISI value from the received signal;
- and
- a comparator to manipulate the operator output signal responsive to an operating mode,
- where the up/down counter and the digital-analog converter are configured to operate at a frequency of (data transmission frequency)/(quantity of storing units).
An Inter Symbol Interference (ISI) canceling circuit, comprising:
- a storing unit to store an ISI value associated with a received signal, where the storing unit includes:
- a first storing unit to store a base voltage value corresponding to the received signal;
- and
- at least one second storing unit to store ISI values corresponding to the received signal;
- an operator to generate an operator output signal by subtracting the ISI value from the received signal;
- and
- a comparator to manipulate the operator output signal responsive to an operating mode,
- where the first storing unit is configured to increase and decrease the operator output signal until it is minimized and to store the base voltage value of the received signal in a training mode, and
- where the first storing unit is configured to provide the stored base voltage value to the operator in a normal mode.
Dependencies are inferred from the claim text.