Resonant Clock Transitions for Low-Distortion IC Timing
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Solution Overview
Problem
Integrated circuits face challenges with clock distortion (jitter and skew) and power consumption in traditional clock distribution networks, which are exacerbated by the need to adjust clock rates and resonant frequencies based on performance and utilization demands.
Innovation Solution
A method to transition between non-resonant and resonant clock modes by gradually modifying the strength of clock sector drivers and tunable resonant switches over a series of clock cycles, using stepwise enabling and damping of resonant circuits to minimize clock distortion and optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If resonant clocking is used to reduce power consumption, then power usage is reduced, but clock distortion (jitter and skew) increases
Solution Approach 1:
The patent applies dynamics by making the resonant clocking system adjustable and adaptive. The resonant frequency can be dynamically tuned to match the operating clock rate, and the system can transition between resonant and non-resonant modes based on performance requirements. This dynamic adjustment allows the system to optimize power consumption while maintaining acceptable clock distortion levels through real-time parameter modification.
Solution Approach 2:
The patent employs parameter changes by modifying the resonant frequency of the LC circuits to match different operating clock rates. The resonant frequency is adjusted based on the integrated circuit's performance demands, allowing the system to achieve optimal power savings at each operating point while preventing excessive clock distortion through careful parameter selection and coordination with the clock distribution network.
2Use of energy by moving object
If resonant frequency is adjusted to match clock rate, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a clock distribution network that can operate in multiple modes (resonant and non-resonant) and support different operating frequencies. The same LC circuits and resonant switches are used across different parts of the network, providing a universal solution that adapts to various clock rates and power requirements without requiring separate dedicated circuits for each function.
Solution Approach 2:
The patent uses parameter changes to adjust the resonant frequency of the LC circuits to match different clock rates. By modifying the electrical characteristics (inductance and capacitance values) of the resonant circuits, the system can efficiently support multiple operating frequencies without requiring physically different circuit topologies, thereby managing complexity while maintaining power efficiency.
3Productivity
If clock rate is increased to improve performance, then productivity is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by enabling the resonant frequency to be tuned and adjusted according to the operating clock rate. As the clock rate increases to improve performance, the resonant circuits are dynamically reconfigured to match the new frequency, ensuring that power efficiency is maintained across the full range of operating speeds rather than being optimized for a single fixed frequency.
Solution Approach 2:
The patent employs periodic action through resonant clocking, where energy is periodically exchanged between the capacitor and inductor in the LC circuits. This periodic energy exchange occurs at the resonant frequency, which is synchronized with the clock rate, allowing the system to deliver the necessary periodic driving force for high-speed operation while minimizing overall power consumption through the efficiency of resonant energy transfer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces clock distortion and power consumption by allowing flexible operation across various frequencies, ensuring tolerable clock cycle compression and skew, while providing power savings by dynamically adjusting resonant and non-resonant modes based on integrated circuit demands.
Implementation Method 1
Resonance occurs due to the periodic exchange of energy over circuit between the capacitor and the inductor
Implementation Method 2
The energy is exchanged between the capacitor (C) and the inductor (L), causing changes in the magnetic field. The changes in the magnetic field cause the energy to be exchanged in the other direction.
Data Source
AI summary
Described is an integrated circuit having a clock distribution network capable of transitioning from a non-resonant clock mode to a first resonant clock mode Transitions between clock modes or between various resonant clock frequencies are done gradually over a series of clock cycles. In example, when transitioning from a non-resonant clock mode to a first resonant clock mode, a strength of a clock sector driver is reduced over a series of clock cycles, and individual ones of a plurality of resonant switches associated with resonant circuits are modified in coordination with reducing the strength of the clock sector driver.