Data Mapping Unit for Simultaneous Switching Noise Reduction
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Solution Overview
Problem
Conventional data transmitting systems face challenges in removing simultaneous switching noise and inter-symbol interference (ISI) while maintaining low cost and small area, as they often require increased power consumption and multiple signal lines, which can lead to reduced data transmission rates and increased costs.
Innovation Solution
A high-speed data transmitting/receiving system that maps 2-bit input data to specific codes with defined voltage levels for three signal lines, ensuring equal numbers of '+1' and '-1' levels, and uses a transmitter with a data mapping unit and transmit driver to output data through these signal lines, along with a receiver featuring differential amplifiers and samplers to restore the input data, thereby maintaining constant current flow and preventing voltage level changes that cause ISI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a differential output structure is used to remove simultaneous switching noise, then simultaneous switching noise is reduced, but power consumption increases and the number of signal lines doubles
Solution Approach 1:
The patent changes the voltage level parameters of signal lines to achieve noise cancellation. By setting specific voltage levels (+1, 0, -1) and ensuring equal numbers of lines at +1 and -1 levels, the system removes simultaneous switching noise without requiring a full differential structure, thus reducing power consumption compared to traditional differential output
2Object-affected harmful factors
If a differential output structure is used to remove simultaneous switching noise, then simultaneous switching noise is reduced, but the number of signal lines increases
Solution Approach 1:
The patent uses voltage level parameter changes (+1, 0, -1) on signal lines to achieve noise cancellation effects without doubling the number of signal lines as required by differential structures. This parameter-based approach maintains signal line quantity while removing simultaneous switching noise
Solution Approach 2:
The patent creates equipotential conditions by ensuring equal numbers of signal lines are at +1 and -1 voltage levels. This balance creates a neutral reference that cancels simultaneous switching noise without requiring additional differential signal lines
3Object-affected harmful factors
If voltage levels are changed to remove simultaneous switching noise, then noise is reduced, but inter-symbol interference occurs due to voltage level transitions
Solution Approach 1:
The patent applies preliminary action by pre-setting the code mapping rules that control voltage level transitions. The system预先 defines which voltage level combinations are allowed and which transitions are permitted, preventing ISI-causing transitions before they occur during data transmission
Solution Approach 2:
The patent uses feedback mechanisms in the code mapping unit to monitor current voltage levels and control transitions. By feedback-controlled code mapping, the system ensures that voltage level changes follow rules that prevent inter-symbol interference while maintaining simultaneous switching noise cancellation
Data Source
AI summary
Disclosed are high-speed data transmitting/receiving system and method capable of removing simultaneous switching noise and ISI at low cost and a small area. A transmitter used in the data transmitting/receiving system includes: a data mapping unit which maps 2-bit input data to one of codes, wherein the voltage level of a first signal line, the voltage level of a second signal line, and the voltage level of a third signal line are set in each of the codes; and a transmit driver which outputs data corresponding to the input data through the first signal line, the second signal line, and the third signal line having the voltage levels corresponding to the mapped code. Here, each of the voltage levels is ‘+1’, ‘0’ or ‘−1’, and the number of signal lines having the voltage level of ‘+1’ is the same as the number of signal lines having the voltage level of ‘−1’.