PAM-4 Transmitting Device Using Selective Symbol Inversion
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Solution Overview
Problem
Existing semiconductor devices face challenges in efficiently transmitting multi-level signals like PAM-4 signals due to high power consumption and reduced effective duration caused by maximum voltage level transitions, which are not adequately addressed by current signal transmission methods.
Innovation Solution
A transmitting device with an inversion determination circuit and encoding block is employed to generate encoded symbols, selectively inverting them based on logic levels to avoid maximum transitions, using a codebook to map bursts to symbols, thereby reducing power consumption and extending signal duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-level signal transmission (PAM-4) is used to transmit more information, then data transmission efficiency is improved, but power consumption increases due to maximum voltage level transitions
Solution Approach 1:
The patent applies preliminary action by performing inversion determination on encoded symbols before transmission. The inversion determination circuit predicts whether maximum transitions will occur and selectively inverts symbols in advance, preventing high-power transitions before they happen. This proactive approach reduces power consumption while maintaining the high data transmission efficiency of PAM-4 signaling.
Solution Approach 2:
The patent changes the parameter of signal inversion state based on predicted transition patterns. By dynamically selecting whether to invert transmitted symbols based on the inversion determination result, the system optimizes the voltage level transitions to avoid maximum transitions, thereby reducing power consumption while preserving data transmission capability.
2Productivity
If multi-level signal transmission (PAM-4) is used to transmit more information, then data transmission efficiency is improved, but effective signal duration is reduced due to maximum voltage level transitions
Solution Approach 1:
The inversion determination circuit performs preliminary analysis of the data sequence to predict maximum transitions before transmission. By proactively inverting symbols to prevent these transitions, the system extends the effective duration of voltage levels on the signal bus, allowing receivers more time to accurately sample and interpret the PAM-4 signal levels.
Solution Approach 2:
The patent converts the potential harm of maximum voltage transitions (which reduce effective signal duration) into a benefit by using the inversion determination mechanism. What would normally be harmful rapid transitions are predicted and prevented through selective symbol inversion, transforming the problem into a solution that extends signal duration while maintaining high data transmission efficiency.
3Use of energy by moving object
If selective symbol inversion is performed to avoid maximum transitions, then power consumption is reduced, but device complexity increases due to additional inversion determination circuit
Solution Approach 1:
The inversion determination circuit performs self-service by autonomously analyzing the encoded symbol sequence and determining which symbols require inversion. This self-determining mechanism eliminates the need for external control logic or complex coordination with other circuit components, achieving power reduction through a relatively simple, self-contained circuit that adds minimal complexity to the overall system.
Data Source
AI summary
A transmitting device is configured to generate a first encoded symbol and a second encoded symbol by encoding a first burst and a second burst, respectively. The transmitting device is configured to generate a first transmitting symbol and a second transmitting symbol by selectively inverting the first and second encoded symbols on the basis of a logic level of a bit with a specific sequence number of each of a previously generated transmitting symbol and the first burst.