On-Die Memory Voltage Regulator for Low-Jitter DDR5 Timing
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Solution Overview
Problem
The increasing bandwidth of memory devices necessitates tight timing synchronization between signals, with voltage stability being a key factor affecting jitter, particularly in DDR5 memory where data signals can be mismatched to clock signals, making the memory sensitive to timing jitter.
Innovation Solution
A memory die with an integrated voltage regulator using both analog and digital loops to quickly stabilize the voltage source during memory operations, ensuring tight timing synchronization by employing a linear, low dropout regulator that turns on in less than one nanosecond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage regulator is integrated on the memory die, then voltage stability and timing synchronization are improved, but device complexity increases
Solution Approach 1:
The voltage regulator is integrated directly on the memory die, merging the voltage regulation function with the memory device. This integration eliminates the need for external voltage regulators, reducing the number of components and interconnections while improving voltage stability and timing synchronization between clock and data signals.
2Speed
If the voltage regulator turns on quickly, then timing synchronization is improved, but settling time requirements become more stringent
Solution Approach 1:
The voltage regulator employs dynamic control mechanisms to achieve fast turn-on (less than one nanosecond) while maintaining precise settling characteristics. The regulator's internal control circuitry dynamically adjusts parameters during the transition and stabilization phases to meet both speed and precision requirements.
3Reliability
If a linear low dropout regulator is used, then voltage stability is improved, but power consumption increases
Solution Approach 1:
The linear low dropout regulator operates in an optimized parameter regime where the voltage differential between input and output is minimized (low dropout), reducing power dissipation while maintaining stable regulation. The regulator dynamically adjusts its operating parameters to balance stability and power efficiency.
Data Source
AI summary
Techniques for an on-memory die voltage regulator is disclosed. In the illustrative embodiment, a voltage regulator on a memory die is enabled upon receipt of a memory operation. The illustrative voltage regulator includes an analog controller that controls a shunt current based on a current output voltage of the voltage regulator. The illustrative voltage regulator also includes a digital controller that controls several switches based on the input voltage that control an effective resistance of part of the voltage regulator.