3D Stacked Chip Read Timing Calibration for Synchronized Output
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Solution Overview
Problem
In three-dimensional semiconductor apparatuses, variations in process, voltage, and temperature (PVT) properties among stacked chips lead to performance skew issues, resulting in inconsistent data output timing and reduced operational speed.
Innovation Solution
The implementation of calibration units in each chip to delay and synchronize read control signals and data output, ensuring that the time from the application of a read command to data output is consistent across all chips, thereby correcting skews and enhancing operational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple chips are stacked in a 3D semiconductor apparatus, then the degree of integration is increased and package size is reduced, but skew in data output timing occurs due to PVT variations
Solution Approach 1:
The patent applies preliminary action by introducing calibration units that pre-adjust the read control signals before they are applied to the memory chips. The calibration units delay the read control signals by different amounts based on predetermined calibration values, proactively compensating for PVT-induced timing skews before the actual read operation occurs. This preliminary timing adjustment ensures that data output from multiple stacked chips becomes synchronized without requiring complex real-time correction mechanisms.
2Speed
If read control signals are applied simultaneously to multiple stacked chips, then operational speed is improved, but data output timing becomes inconsistent due to chip performance variations
Solution Approach 1:
The patent implements local quality by applying different delay characteristics to different read control signals destined for different chips. Each calibration unit is configured with specific calibration values that tailor the delay amount to the particular performance characteristics of its associated chip. This localized adjustment ensures that each chip's data output timing is optimized individually, compensating for local PVT variations while maintaining overall system synchronization.
3Manufacturing precision
If calibration units are added to correct timing skew, then data output timing consistency is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the timing parameters of read control signals through the calibration units. Instead of changing the physical structure or adding complex control logic, the invention adjusts the temporal parameters (delay amounts) of the control signals based on predetermined calibration values. This approach corrects timing skew by changing signal timing characteristics rather than redesigning the overall apparatus architecture, thereby minimizing the increase in device complexity.
Data Source
AI summary
A semiconductor apparatus has a plurality of chips stacked therein, and generation timing of read control signals for controlling read operations of the plurality of stacked chips is controlled such that times after a read command is applied to when data are outputted from respective chips are made to substantially correspond to one another.