Clock Jitter Cancellation Using Supply-Voltage Delay Compensation
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Solution Overview
Problem
Existing solutions for mitigating jitter in electronic devices, such as memory devices, often increase power consumption and latency, and are ineffective as timing requirements become tighter, particularly in double data rate (DDR) interfaces.
Innovation Solution
A jitter cancellation component is introduced into the signal path between clock signals, introducing delay proportional to the supply voltage to offset fluctuations caused by other circuitry, with a control component adjusting the delay to minimize jitter through an algorithm that responds to supply voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing jitter mitigation solutions are implemented, then jitter is reduced, but power consumption increases
Solution Approach 1:
The jitter cancellation component automatically adjusts its own delay characteristics based on real-time jitter measurements without requiring external control signals. The component monitors the jitter between first and second clock signals and self-adjusts the delay applied to the second clock signal, eliminating the need for additional control circuitry and reducing overall power consumption.
Solution Approach 2:
The system implements a feedback mechanism where the jitter cancellation component continuously measures the jitter between clock signals and adjusts its delay characteristics accordingly. The component receives jitter information and automatically modifies the delay applied to the second clock signal to minimize jitter, creating a closed-loop control system that optimizes performance while maintaining low power consumption.
2Reliability
If existing jitter mitigation solutions are implemented, then jitter is reduced, but latency increases
Solution Approach 1:
The jitter cancellation component dynamically adjusts its delay characteristics in real-time based on the measured jitter conditions. Rather than using fixed delay values, the component modifies the delay applied to the second clock signal according to the current jitter state, allowing it to maintain jitter cancellation effectiveness while minimizing latency penalties, especially when jitter levels are low.
3Productivity
If timing requirements become tighter, then data rates increase, but existing jitter mitigation solutions become ineffective
Solution Approach 1:
The jitter cancellation component is designed to operate effectively across a wide range of timing conditions by dynamically adjusting its delay characteristics. As data rates increase and timing requirements become tighter, the component continues to monitor jitter and adjust the delay applied to the second clock signal in real-time, maintaining effectiveness where static solutions fail.
Solution Approach 2:
The system changes the delay parameter dynamically based on jitter measurements and timing conditions. By adjusting the delay applied to the second clock signal according to real-time jitter information, the component adapts to varying data rates and timing requirements, maintaining jitter mitigation effectiveness across different operating conditions including high-speed DDR interfaces.
Data Source
AI summary
Methods, systems, and devices for jitter cancellation with automatic performance adjustment are described. Within a clock distribution system in an electronic device (e.g., a memory device), a jitter cancellation system may be configured to introduce delay between an input clock signal and output clock signal that is directly proportional to the supply voltage for the clock distribution system. In response to supply noise, the delay introduced by the jitter cancellation system may vary directly with respect to the supply voltage fluctuations and thus may offset fluctuations in the delay introduced by other components of the clock distribution system, which may vary inversely with respect to the supply voltage fluctuations. A control component within the jitter cancellation system may execute an algorithm to adjust or regulate the delay introduced by the jitter cancellation system, including its responsiveness to fluctuations in the supply voltage.