Clock Distribution Delay Compensation for Supply Ripple Tolerance
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Solution Overview
Problem
As integrated circuits become more complex, mismatches in clock signal arrival times due to fluctuations in supply voltage cause timing issues and limit operational speed, as the delay introduced by clock distribution buffers is sensitive to voltage changes, necessitating a reduction in supply voltage level dependency on clock distribution network propagation delay.
Innovation Solution
A circuit implementation featuring a sensing circuit and a phase interpolator that generates control signals to adjust the coupling between multiple paths with different propagation delays, allowing the clock signal delay to be controlled and compensated for voltage fluctuations, thereby maintaining consistent clock signal delivery across the integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If buffers or amplifiers are used in the clock distribution network, then the clock signal can be buffered and distributed throughout the integrated circuit, but the propagation delay becomes sensitive to supply voltage fluctuations causing timing mismatches
Solution Approach 1:
The patent dynamically changes the propagation delay parameter of clock distribution buffers by adjusting their operating conditions based on detected supply voltage levels. When voltage drops are detected, the buffers are configured to provide additional delay compensation, thereby maintaining consistent clock signal timing across different sectors despite voltage fluctuations
Solution Approach 2:
The patent implements a feedback mechanism where supply voltage fluctuations are detected and used to control the propagation delay of buffers in real-time. The delay adjustment is directly responsive to voltage conditions, creating a closed-loop system that automatically compensates for timing mismatches caused by power supply variations
2Productivity
If the integrated circuit operates at higher speed or frequency, then productivity increases, but timing mismatches in clock signal arrival become more critical and limit operational speed
Solution Approach 1:
The patent dynamically adjusts the propagation delay parameter of clock distribution buffers based on detected supply voltage sags. When voltage drops are detected in specific sectors, the buffers in those sectors are configured to provide additional delay, thereby compensating for timing mismatches and enabling the circuit to maintain higher operational speeds without timing errors
3Manufacturing precision
If supply voltage level dependency on propagation delay is reduced, then timing consistency improves, but additional control circuits and complexity are introduced
Solution Approach 1:
The patent introduces intermediary control circuits that detect supply voltage fluctuations and mediate the propagation delay of buffers accordingly. These intermediary elements act as a bridge between the power supply and clock distribution network, automatically adjusting buffer characteristics in response to voltage conditions without requiring complex centralized control
Solution Approach 2:
The patent divides the clock distribution network into multiple sectors, each with independently controllable buffers. This segmentation allows localized delay adjustment in response to sector-specific voltage sags, reducing the need for global complexity while maintaining timing consistency across the entire circuit
Data Source
AI summary
Embodiments relate to a circuit implementation for controlling a delay of a clock signal. The clock delay control circuit includes a sensing circuit and a phase interpolator controlled by the sensing circuit. The sensing circuit generates a first control signal that increases when a level of a supply voltage increases, and decreases when the level of the supply voltage decreases. Moreover, the sensing circuit generates a second control signal that decreases when the level of the supply voltage increases, and increases when the level of the supply voltage decreases. The phase interpolator includes multiple paths, each having a different propagation delay. The coupling between each path and the output node of the phase interpolator is controlled by the control signals generated by the sensing circuit.