Shared Reference Clock Filtering for Low-Jitter IC Synchronization
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Solution Overview
Problem
In computing systems, the distribution of reference clock signals to multiple integrated circuits consumes significant area and power, and high-frequency noise on power supplies can cause jitter and timing variations, leading to performance issues.
Innovation Solution
A Phase-Locked Loop (PLL) generates a source clock signal with two inverse phases, which are filtered using a unit comprising capacitors and inductors in parallel, reducing power consumption and area by sharing a reference clock signal across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference clock signals are distributed to multiple integrated circuits, then clock synchronization is achieved, but power consumption and area increase significantly
Solution Approach 1:
Multiple integrated circuits share a single reference clock signal through a common distribution network with series inductors and parallel capacitors, merging what would otherwise be separate clock distributions into one shared resource, thereby reducing total power consumption and area
Solution Approach 2:
The shared reference clock signal serves multiple functional units across different integrated circuits simultaneously, allowing one clock source to perform the function of what would traditionally require multiple separate clock sources
2Reliability
If reference clock signals are distributed to multiple integrated circuits, then clock synchronization is achieved, but area consumption increases significantly
Solution Approach 1:
The clock distribution network merges multiple clock paths into a single shared infrastructure using series inductors and parallel capacitors, reducing the total area required compared to separate clock distribution networks for each integrated circuit
3Object-affected harmful factors
If power supply filtering is applied to mitigate noise, then noise effects are reduced, but device complexity increases
Solution Approach 1:
Passive filtering components (series inductors and parallel capacitors) are introduced as intermediary elements between the power supply and the reference clock distribution network, acting as mediators that reduce noise without requiring complex active filtering circuits
Solution Approach 2:
The filtering approach changes the electrical parameters (impedance, noise attenuation) of the power supply connection by adding simple passive components, achieving noise reduction through parameter modification rather than complex circuitry
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 power consumption and area by sharing a reference clock signal, minimizing noise-induced jitter and timing variations, thereby enhancing the performance of integrated circuits in computing systems.
Implementation Method 1
A filter unit may be configured to filter the reference clock signal. In one embodiment, the filter unit may include at least one capacitor and at least one inductor. Each of the at least one capacitor and the at least one inductor may be coupled, in parallel, between the phases of the reference clock signal.
Data Source
AI summary
A system for sharing a reference clock signal between multiple devices is disclosed. The system includes a source device, and a plurality of destination devices. The source device may be configured to generate a reference clock signal and transmit data via a communication link. The reference clock signal may include first and second phases, and the second phase may be an inverse of the first phase. A filter unit configured to filter the reference clock signal may be coupled between the first and second phases of the reference clock signal. Each destination device may be configured to receive the reference clock signal and receive the data dependent upon the reference clock signal.