Digital Isolator Edge Encoding for EMI-Robust Signal Decoding
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Solution Overview
Problem
Current digital isolators face challenges in maintaining high anti-interference ability during digital signal transmission, particularly due to electromagnetic interference, which can lead to decoding errors caused by changes in the number of continuous pulses.
Innovation Solution
The proposed digital isolator encodes rising and falling edges of digital signals into distinct pulse sequences with different time intervals, using encoding and decoding circuits to transmit and decode these sequences through an isolation element, enhancing the anti-interference ability by richer information content and precise edge detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signals are transmitted through isolation elements, then electrical isolation and safety are improved, but electromagnetic interference causes decoding errors due to changes in pulse sequences
Solution Approach 1:
The patent uses periodic pulse sequences with specific time intervals to encode digital signals. Rising edges are encoded as pulse sequences with a first time interval between continuous pulses, while falling edges are encoded as pulse sequences with a second time interval. This periodic encoding structure allows the receiving end to distinguish between different signal edges by detecting the time intervals, thereby maintaining signal integrity despite electromagnetic interference during isolation transmission.
2Loss of information
If pulse sequences are used to encode digital signals, then information content is enriched, but signal transmission delay increases
Solution Approach 1:
The patent changes the time interval parameter of pulse sequences to encode different types of digital signal edges. By assigning different time intervals (first time interval for rising edges, second time interval for falling edges), the system enriches the information content of the pulse sequences without requiring additional signal channels or complex modulation schemes, thus minimizing transmission delay while maintaining high information density.
Data Source
AI summary
A digital isolator can include: an encoding circuit configured to receive and encode an input digital signal, in order to generate an encoded signal, wherein a rising edge of the input digital signal is encoded as a first pulse sequence, and a falling edge of the input digital signal is encoded as a second pulse sequence; an isolation element coupled to the encoding circuit, and being configured to transmit the encoded signal in an electrically isolated manner; and a decoding circuit configured to receive the encoded signal through the isolation element, and to decode the encoded signal, in order to generate an output digital signal consistent with the input digital signal.