Pulse-Carrier Digital Isolator for Low-EMI Edge Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional digital isolator architectures face issues with high power consumption and electromagnetic interference due to continuous pulse carriers, and increasing channel numbers lead to higher production costs and area consumption.
Innovation Solution
A digital isolator module employing pulse carrier modulation, where the transmitter circuit generates different numbers of pulse carriers responsive to rising and falling edges of the data input signal, reducing system complexity and eliminating continuous pulse carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous pulse carriers are used for signal transmission, then data transmission reliability is improved, but power consumption increases and electromagnetic interference worsens
Solution Approach 1:
The patent applies periodic action by using edge-triggered pulse carriers instead of continuous carriers. Pulse carriers are generated periodically only at signal edges (rising or falling transitions), rather than continuously during the entire data transmission period. This periodic generation maintains reliable signal coupling across the isolation barrier while significantly reducing power consumption and electromagnetic interference associated with continuous carrier transmission.
2Object-affected harmful factors
If multiple communication channels are used to reduce interference, then signal isolation is improved, but device complexity and production cost increase
Solution Approach 1:
The patent merges multiple communication channels into a single channel by using edge-triggered pulse carrier modulation on one transmission path. Instead of requiring separate channels for different signal types or directions, the invention combines bidirectional communication and signal differentiation into a single channel through intelligent pulse generation triggered by signal edges, thereby reducing device complexity while maintaining interference isolation.
3Productivity
If continuous pulse carriers are transmitted, then signal coupling efficiency is improved, but electromagnetic interference and power consumption worsen
Solution Approach 1:
The patent extracts and removes the continuous carrier component from the transmission signal, keeping only the necessary edge-triggered pulse portions. By taking out the continuous carrier that causes electromagnetic interference and power consumption issues, while retaining the essential pulse coupling mechanism for signal transmission, the invention achieves reduced harmful effects while maintaining adequate signal coupling efficiency across the isolation barrier.
Data Source
AI summary
A digital isolator module with pulse carrier modulation is provided, comprising an isolation barrier, operable to develop an isolated output signal in response to an input signal, a transmitter circuit adapted to receive a data input signal and coupled to the isolation barrier, and a receiver circuit coupled to the isolation barrier to receive the isolated output signal and generate a data output signal. The transmitter circuit is adapted to be operable to generate a transmitter output signal in response to the data input signal, and the transmitter output signal comprises different number of pulse carrier respectively responsive to a rising edge and a falling edge of the data input signal. By employing the proposed pulse carrier modulation of the present invention, it has been verified to reduce channel numbers, IC power consumption and electromagnetic interferences. In addition, jitter disturbances can be avoided and solved effectively.