Distributed Oscillator Clocking for Low-Power Synchronous Transceivers
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Solution Overview
Problem
Integrated circuit devices with multiple transceivers face challenges in distributing synchronous, low-jitter, high-frequency clocks over long distances, leading to increased power demands and design complexities due to the use of clock-tree techniques like H-trees.
Innovation Solution
A frequency-controllable distributed oscillator system using coupled transmission line oscillators with impedance elements and controllable capacitance to generate and distribute synchronous, in-phase, phase-locked clock signals, reducing the need for separate distribution structures and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock-tree techniques (H-trees) are used to distribute synchronous clocks, then synchronous clock distribution is achieved, but power consumption increases and design complexity increases
Solution Approach 1:
The patent merges the clock generation function with the clock distribution function by using transmission lines that serve dual purposes: they are both the oscillating elements that generate clock signals and the distribution medium that delivers synchronized clocks to multiple transceivers. This eliminates the need for separate H-tree distribution structures, thereby reducing power consumption while maintaining synchronous clock distribution.
Solution Approach 2:
The transmission lines in the distributed oscillator system perform multiple functions simultaneously: they act as resonant elements for clock generation, as distribution channels for delivering clock signals, and as impedance-matching structures. This multi-functionality reduces the overall system complexity and power requirements compared to traditional approaches that require dedicated distribution trees.
2Reliability
If clock-tree techniques (H-trees) are used to distribute synchronous clocks, then synchronous clock distribution is achieved, but device complexity and wiring requirements increase
Solution Approach 1:
The patent combines the clock generation and distribution functions into a single integrated structure where transmission lines serve both as oscillators and distribution channels. This eliminates the need for complex H-tree wiring structures, reducing device complexity and freeing up area for functional circuitry while maintaining synchronous clock distribution to all transceivers.
Solution Approach 2:
The distributed oscillator system segments the clock distribution function across multiple transmission line oscillators that are distributed throughout the device. Each transmission line oscillator independently generates and distributes clock signals to local transceivers, eliminating the need for a centralized complex H-tree structure and reducing overall wiring requirements.
3Use of energy by moving object
If transmission line oscillators are coupled with impedance elements, then synchronous clock signals are distributed with reduced power consumption, but device complexity increases
Solution Approach 1:
The patent introduces impedance elements at specific locations along the transmission lines where they are most effective for coupling oscillators and maintaining signal integrity. This localized approach to complexity management allows the system to achieve low power consumption through efficient oscillator coupling while minimizing overall device complexity by placing complexity only where needed rather than throughout the entire system.
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
The solution enables efficient distribution of synchronous clock signals across large integrated circuit devices, reducing power consumption and design complexities while maintaining synchronization and phase relationships, and is particularly effective in optical networking devices.
Implementation Method 1
at least one impedance element coupling the at least one respective transmission line segment of a first transmission line oscillator in the pair of transmission line oscillators to the at least one respective transmission line segment of a second transmission line oscillator in the pair of transmission line oscillators, impedance of the at least one impedance element being different from impedance of each of the at least one respective transmission line segment to cause reflection at the at least one impedance element
Data Source
AI summary
An integrated circuit transceiver device includes a plurality of functional circuits, and clock circuitry for distributing synchronous, in-phase, phase-locked clock signals to all transceiver circuits. The clock circuitry includes a frequency-controllable distributed oscillator including at least one coupled pair of transmission line oscillators having a respective oscillator core, and at least one respective transmission line segment. At least one impedance element couples the at least one respective transmission line segment of a first transmission line oscillator to the at least one respective transmission line segment of a second transmission line oscillator. Impedance of the impedance element is different from impedance of each respective transmission line segment to cause reflection at the at least one impedance element. At least one tap corresponding to each respective one of the transmission line oscillators outputs synchronous, in-phase, phase-locked clock signals for the functional circuits at points along the distributed oscillator.