Multi-Conductor Amplitude-Phase Signaling for I/O Bandwidth
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Solution Overview
Problem
Current integrated circuit I/O systems face bottlenecks due to limitations in data transfer rates and radiated emissions, as the number and size of reliable off-chip connections have reached physical limits, and existing modulation techniques struggle to keep pace with increasing bandwidth demands.
Innovation Solution
A method and system for digital signaling using multiple conductors to represent digital data with unique two-dimensional or n-dimensional coordinates, where the amplitude and phase of a periodic waveform are converted into corresponding voltages or currents applied to each conductor, allowing for increased data transfer rates without significant on-chip resource or power consumption, and reduced radiated emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional differential-pair interconnections are used to transfer high-speed data, then signal coupling or crosstalk issues are addressed, but two I/O connections are required for each I/O path which does not significantly increase I/O capacity
Solution Approach 1:
The patent transitions from binary signaling (0 and 1) to multi-level signaling by utilizing both amplitude and phase dimensions of the signal. Each conductor can represent multiple bits simultaneously through coordinated amplitude-phase combinations, effectively adding dimensional capacity without requiring additional conductors.
Solution Approach 2:
The patent changes the signaling parameters from simple voltage levels to coordinated amplitude and phase parameters. By varying both amplitude and phase simultaneously across multiple conductors, the system achieves higher data density per conductor while maintaining signal integrity through the structured parameter relationships.
2Productivity
If multiplexed data/address busses are used to increase I/O capacity, then the number of connections is reduced, but the short time required to multiplex data and addresses onto the same pins becomes a relatively long or slow operation compared to processing ability
Solution Approach 1:
The patent encodes multiple bits of data simultaneously into the amplitude and phase parameters before transmission begins. This preliminary encoding eliminates the need for sequential multiplexing operations, allowing data to be prepared and transmitted in parallel, thus maintaining high processing speeds without the bottleneck of sequential pin switching.
3Productivity
If the number of transistors on a chip is increased following Moore's Law, then processing power increases, but the number and size of reliable off-chip connections has nearly reached physical limits
Solution Approach 1:
The patent adds dimensional capacity to each I/O connection by utilizing coordinated amplitude and phase variations across multiple conductors. This allows a fixed number of physical connections to support exponentially increasing data throughput, decoupling processing power growth from I/O connection complexity growth.
4Speed
If higher frequency signals that are more densely packed are used to increase data transfer rates, then bandwidth increases, but electromagnetic interference and cross-coupling of on-chip signals increase
Solution Approach 1:
The patent employs periodic waveforms with specific phase relationships between conductors. By using coordinated periodic signals with controlled phase differences, the system achieves high data rates while the periodic structure allows for predictable interference patterns that can be managed through proper timing and synchronization, reducing unpredictable electromagnetic interference.
Data Source
AI summary
Systems and methods for communicating digital data associated with amplitudes and phases of a virtual periodic waveform having a designated period between components connected by n conductors include, in one embodiment, circuitry that converts a first amplitude and a first phase to a first corresponding voltage or current and applies the first corresponding voltage or current to a first one of the plurality of conductors, and converts the first amplitude and the first phase to (n−1) corresponding voltages or currents based on amplitudes of the periodic waveform phase shifted by about m*(360/n) relative to the first phase where m is indexed from one to (n−1) and applies each corresponding voltage or current to an associated conductor of the plurality of conductors. The systems and methods are particularly suited for reducing the number of conductors to obtain a desired I/O data rate/throughput for integrated circuit chips and wired networks.