Clock Distribution Bias Control for Low-Power Skew Compensation
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Solution Overview
Problem
High-frequency clock signals in integrated circuits face inaccuracies such as clock skew and jitter due to electromagnetic propagation delays, buffer delays, and manufacturing variations, which can lead to performance issues and increased power consumption.
Innovation Solution
A clock distribution network (CDN) is adjusted by modifying power delivery based on the frequency of the clock signal, process variations, and temperature conditions, using a voltage-controlled delay line (VCDL) and timing monitor circuit to generate bias control signals that optimize power distribution across buffer circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the frequency of the clock signal is increased to improve processing speed, then productivity is improved, but clock skew and jitter increase causing timing inaccuracies
Solution Approach 1:
The patent adjusts power delivery parameters to buffer circuits based on operating conditions (temperature, process variations, voltage) to maintain timing accuracy at high frequencies. By dynamically changing power parameters, the system compensates for increased skew and jitter that occur at higher clock frequencies, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The timing monitor circuit continuously monitors clock signal quality and provides feedback to adjust power delivery to buffers. This closed-loop feedback mechanism detects timing inaccuracies caused by high-frequency operation and compensates by adjusting buffer power, thereby maintaining timing accuracy while operating at high productivity levels.
2Use of energy by moving object
If power consumption is reduced to improve energy efficiency, then use of energy is improved, but clock signal accuracy and performance deteriorate
Solution Approach 1:
The system dynamically adjusts power delivery to buffer circuits based on actual operating conditions rather than providing constant maximum power. The power management circuit modifies buffer power levels in response to temperature, process variations, and voltage changes, achieving energy efficiency while maintaining sufficient power for accurate clock distribution under varying load conditions.
Solution Approach 2:
The patent changes power delivery parameters dynamically based on operating conditions. By adjusting voltage and current parameters to buffers according to temperature and process variations, the system achieves optimal power efficiency while maintaining clock signal accuracy, resolving the contradiction between energy efficiency and reliability.
3Reliability
If buffer power is increased to reduce clock skew and jitter, then timing accuracy is improved, but power consumption increases
Solution Approach 1:
The system adjusts power parameters to buffers dynamically based on measured timing accuracy and operating conditions. Rather than continuously providing maximum power, the power management circuit modifies buffer power levels according to actual needs, achieving timing accuracy while minimizing unnecessary power consumption.
Solution Approach 2:
The patent implements dynamic power adjustment where buffer power levels are continuously adapted based on timing monitor feedback and operating conditions. This dynamic approach ensures sufficient power is provided only when and where needed to maintain timing accuracy, avoiding wasteful continuous high-power operation.
4Productivity
If the clock distribution network is designed for high frequency operation, then productivity is improved, but electromagnetic propagation delays and RC delays cause increased clock skew
Solution Approach 1:
The patent adjusts power delivery parameters to compensation for frequency-dependent effects. At higher clock frequencies, the system increases power to buffers to overcome increased electromagnetic propagation delays and RC delays, thereby maintaining timing accuracy while operating at high productivity levels.
Solution Approach 2:
The timing monitor circuit detects clock skew caused by frequency-dependent delays and provides feedback to adjust buffer power accordingly. This feedback loop compensates for the increased propagation and RC delays that occur at high frequencies, maintaining timing reliability despite high-speed operation.
Data Source
AI summary
Apparatus, systems, and methods are disclosed that operate to adjust power received by a clock distribution network at least partially based on operating conditions of an integrated circuit. Additional apparatus, systems, and methods are disclosed.