Digital Isolator Noise Reduction Circuit Using Differential Comparator
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Solution Overview
Problem
Existing digital isolator systems face noise issues due to common mode transients, requiring high signal voltage to overcome noise, which leads to inefficiencies and inaccuracies in signal reconstruction.
Innovation Solution
A digital isolation system using a differential comparator to reject transient noise and reduce signal voltage, comprising a transmitter circuit, noise reduction circuit, and reconstruction circuit, which removes noise tails from received signals, allowing for smaller signal transmission and lower power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high signal voltage is used to overcome noise, then signal detection reliability is improved, but power consumption increases
Solution Approach 1:
A differential comparator is introduced as an intermediary device between the transformer and the signal reconstruction logic. The comparator amplifies the differential signal while rejecting common-mode noise, enabling reliable signal detection at lower voltage levels and thus reducing power consumption while maintaining detection reliability.
Solution Approach 2:
The system changes from single-ended signal detection to differential signal detection. By using a differential comparator that compares two signals (positive and negative edges), the system can detect signal transitions with higher precision and noise immunity, allowing operation at lower voltage levels and reducing power consumption.
2Reliability
If high signal voltage is transmitted to overcome noise, then noise immunity is improved, but signal transmission efficiency deteriorates
Solution Approach 1:
The differential comparator acts as an intermediary that processes both positive and negative edge signals simultaneously. This allows the system to achieve noise immunity through differential detection without requiring excessive signal voltage, thereby improving transmission efficiency by reducing the energy required for each signal transmission.
Solution Approach 2:
The system uses periodic pulse transmission with defined positive and negative edges. The differential comparator efficiently detects these periodic transitions, allowing for optimized transmission timing and reduced duty cycle, which improves overall transmission efficiency while maintaining noise immunity.
3Measurement precision
If complex pulse counting logic is used to reconstruct signals, then signal reconstruction accuracy is improved, but propagation delay increases
Solution Approach 1:
The differential comparator serves as an intermediary that performs the complex comparison and decision-making function in a single integrated circuit stage. This eliminates the need for multiple discrete logic gates and pulse counting stages, maintaining high reconstruction accuracy while significantly reducing propagation delay.
Solution Approach 2:
The system merges the detection of positive edges, negative edges, and signal reconstruction into a single differential comparator operation. By combining these functions that would traditionally require separate circuit stages into one integrated comparator, the system achieves accurate signal reconstruction with minimal propagation delay.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves improved noise immunity, reduced power consumption, and shorter propagation delay by rejecting common mode noises and enabling smaller signal transmission, resulting in higher performance and lower costs.
Implementation Method 1
The output of the edge detection circuits 101 and 103 is input into an OR gate 104. The combined signals are then transferred across a micro-transformer 105.
Data Source
AI summary
The invention is directed to a digital isolation system including an isolation barrier, a transmitter circuit receiving an input signal and transmitting a positive pulse upon detecting a first type of edge in the input signal and transmitting a negative pulse upon receipt of a second type of edge in the input signal and a receiver circuit receiving the transmitted signals, removing noise in the received signal and reconstructing the input signal using a differential comparator.