ZQ calibration module and memory

By using dichotomy and successive approximation methods in the ZQ calibration unit, the problems of long and large calibration errors of ZQ calibration modules under high pad capacitance are solved, and more efficient and accurate ZQ calibration is achieved.

CN119724303APending Publication Date: 2025-03-28DOSILICON CO LTD
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Patent Information

Application Number
CN202411799189.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the case of high pad capacitance, the existing ZQ calibration module has too long induction time, resulting in large calibration errors and difficulty in completing accurate calibration in a short time.

Method used

Set up a pull-up and pull-down calibration code for the long calibration mode ZQCL using a dichotomous method, and a successive approximation method for the short calibration mode ZQCS to reduce the number of comparisons and optimize the calibration time.

Benefits of technology

Reduce the number of comparisons in long calibration mode to improve calibration accuracy and efficiency; adjust the time allocation in short calibration mode to ensure that the pull-up device fully senses and completes more step calibration, improving the accuracy of the calibration code.

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Abstract

The ZQ calibration module (100) is provided with a ZQ bonding pad (1) connected with an external standard resistor; the first pull-up device (2) is connected in series with an external standard resistor through the ZQ bonding pad (1); a second pull-up device (3); a pull-down device (4) connected in series with the second pull-up device (3); an inner voltage division resistor; one end of the first comparator (6) is connected with the connection point of the first pull-up device (2) and the external standard resistor, and the other end of the first comparator (6) is connected with the internal voltage dividing resistor; one end of the second comparator (7) is connected with a connection point of the second pull-up device (3) and the pull-down device (4), and the other end of the second comparator (7) is connected with the internal voltage division resistor; and a ZQ calibration unit (5) that generates a pull-up calibration code and a pull-down calibration code. The ZQ calibration unit (5) has a first calibration code generation unit (8) that generates the pull-up calibration code and the pull-down calibration code using a dichotomy in a long calibration mode. And a second calibration code generation unit (9) that generates a pull-up calibration code and a pull-down calibration code using a successive approximation method in the case of a short calibration mode.
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