High resolution ZQ calibration method using hidden least significant bit (HLSB)

High resolution ZQ calibration method using hidden least significant bit (HLSB)

A high resolution impedance adjustment (ZQ) calibration method using a hidden least significant bit (HLSB) is provided. The high resolution ZQ calibration method generates a data input/output (DQ) code of n+1 bits without a calibration time increase by adding the hidden least significant bit (HLSB)...

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Bibliographische Detailangaben
Hauptverfasser: Lee, Junha, Park, Jungjune, Jeong, Byunghoon, Kang, Hyunsuk, Kang, Kyoungtae
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
PHYSICS
STATIC STORES
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Zusammenfassung:A high resolution impedance adjustment (ZQ) calibration method using a hidden least significant bit (HLSB) is provided. The high resolution ZQ calibration method generates a data input/output (DQ) code of n+1 bits without a calibration time increase by adding the hidden least significant bit (HLSB) to a ZQ code of n bits output in a ZQ calibration operation of an impedance adjustment (ZQ) pad. A change in a termination resistance of the DQ pad is reduced as small as possible by the DQ code of n+1 bits.