Calibration devices and operating methods thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsJichull Jeong, Youngwoo Park, Seungjin Park, Jindo Byun, Seunghoon Lee, Eunsang Lee, Chaekang Lim
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Abstract
Disclosed is a memory device which includes a driver unit that includes a pull-up driver and a pull-down driver, a ZQ calibration unit that performs ZQ calibration with respect to the driver unit based on an external resistor and a first reference voltage and generates a first ZQ code corresponding to the first reference voltage, and a code conversion unit that generates a second ZQ code corresponding to a second reference voltage different from the first reference voltage, based on the first ZQ code.
Claims20
A memory device comprising:
- a driver circuit including a pull-up driver and a pull-down driver;
- a ZQ calibration circuit configured to
- perform ZQ calibration with respect to the driver circuit based on a resistance value and a first reference voltage, and
- generate a first ZQ code corresponding to the first reference voltage based on the ZQ calibration;
- and
- a code conversion circuit configured to:
- based on the first ZQ code, generate a second ZQ code corresponding to a second reference voltage different from the first reference voltage, and
- based on the first ZQ code, generate a third ZQ code corresponding to a third reference voltage different from the first reference voltage and the second reference voltage,
- wherein the first reference voltage, the second reference voltage, and the third reference voltage are in a range between a power supply voltage of the memory device and a ground voltage.
A calibration method of a memory device, the method comprising:
- performing ZQ calibration with respect to a driver circuit included in the memory device based on a resistance value and a first reference voltage, to generate a first ZQ code corresponding to the first reference voltage;
- generating a second ZQ code corresponding to a second reference voltage different from the first reference voltage based on conversion of the first ZQ code;
- and
- based on the first ZQ code, generating a third ZQ code corresponding to a third reference voltage different from the first reference voltage and the second reference voltage,
- wherein the first reference voltage, the second reference voltage, and the third reference voltage are in a range between a power supply voltage and a ground voltage.
An electronic system comprising:
- a main processor configured to control the electronic system;
- and
- a storage device configured to store data,
- wherein the storage device includes a calibration circuit configured to:
- generate a first ZQ code corresponding to a first reference voltage based on a resistance value and the first reference voltage,
- generate a second ZQ code corresponding to a second reference voltage based on the first ZQ code, and
- based on the first ZQ code, generate a third ZQ code corresponding to a third reference voltage different from the first reference voltage and the second reference voltage,
- wherein the first reference voltage, the second reference voltage, and the third reference voltage are in a range between a power supply voltage and a ground voltage.
Dependencies are inferred from the claim text.