Phase-Shift Encoding to Minimize Signal Transitions
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Solution Overview
Problem
The increasing power consumption in advanced integrated circuits due to shrinking transistor sizes poses a challenge, as dynamic power consumption is not effectively managed by conventional amplitude and phase modulation techniques, leading to higher energy usage and bandwidth requirements.
Innovation Solution
A signaling method that reduces power consumption by utilizing phase shifts or intermediate amplitudes during voltage transitions, allowing for encoding of multiple bits within a single transition, thereby reducing the number of transitions and maintaining a 1-bit per clock cycle transmission rate with reduced latency and bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional amplitude and phase modulation techniques are used to increase information rate, then the information rate within a band-limited channel is improved, but the dynamic power consumption increases due to more frequent voltage transitions
Solution Approach 1:
The patent changes the modulation parameter from amplitude/phase variations to transition presence/absence. By encoding information in whether a voltage transition occurs (transition minimization encoding), the system achieves higher information rates without proportionally increasing voltage switching frequency, thereby reducing dynamic power consumption while maintaining bandwidth efficiency
Solution Approach 2:
The patent replaces conventional electromagnetic modulation mechanisms (amplitude and phase modulation of continuous carriers) with a digital transition-based encoding scheme. This substitution eliminates the need for continuous high-frequency voltage switching, reducing dynamic power consumption while achieving the same information transmission goal through transition-minimized encoding
2Use of energy by moving object
If the number of voltage transitions is reduced to lower power consumption, then dynamic power consumption is improved, but the information rate decreases due to fewer transitions available for encoding
Solution Approach 1:
The patent adds a temporal dimension to the encoding scheme by using the presence or absence of transitions at specific time positions within a codeword. This dimensional approach allows multiple bits to be encoded in a single transition pattern, achieving high information rates even with reduced transition counts. The encoder selects codewords from a pre-defined set where each codeword represents multiple bits through its unique transition pattern
3Use of energy by moving object
If transition minimization encoding is used to reduce power consumption, then dynamic power consumption is improved, but the minimum waveform pulse width is shortened requiring doubled transmission line bandwidth
Solution Approach 1:
The patent dynamically adjusts the transition timing within the allowed pulse width constraints. By strategically placing transitions at optimal positions within each codeword period and using adaptive encoding that considers the previous transition state, the system maintains sufficient pulse widths for reliable detection while minimizing the total number of transitions, thus avoiding the bandwidth doubling penalty
Data Source
AI summary
A method of encoding a stream of data bits includes encoding a bit 1 of the data stream as a first symbol if a bit immediately preceding the bit 1 is encoded as 0 and a bit of the data stream immediately succeeding the bit 1 is 0, encoding the bit immediately succeeding the bit 1 as 1, encoding a bit 0 of the data stream as a second symbol if a bit immediately preceding the bit 0 is encoded as 1 and a bit of the data stream immediately succeeding the bit 0 is 1, and encoding the bit immediately succeeding the bit 0 as 0.