Isolation Channel Direct Demodulation for Transient-Immune Data Links
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Solution Overview
Problem
Conventional common mode transient suppression techniques introduce substantial delay and are ineffective against common mode transient events with durations greater than the deglitching time, leaving systems vulnerable to fault conditions and compromising performance in high-rate data transfer applications.
Innovation Solution
The proposed solution involves a bandpass filter circuit and a direct demodulator that directly demodulate a received differential signal, combined with a data-edge-encoded signal generated using an LC oscillator circuit, to enable efficient communication across an isolation barrier with improved common mode transient immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deglitching circuits are used to suppress common mode transient events, then common mode transient immunity is improved, but propagation delay increases substantially
Solution Approach 1:
The patent extracts and removes the deglitching circuit from the signal path, replacing it with a direct demodulation architecture. The common mode transient suppression function is achieved through the bandpass filter and direct demodulator combination, which eliminates the substantial delay introduced by conventional deglitching circuits while maintaining transient immunity.
Solution Approach 2:
The patent replaces the mechanical/electronic deglitching circuit with a signal processing approach using bandpass filtering and direct demodulation. This substitution achieves common mode transient suppression through frequency-selective filtering and synchronous detection, avoiding the time-delaying mechanism of conventional deglitching circuits.
2Reliability
If deglitching circuits are used to suppress common mode transient events, then common mode transient immunity is improved, but data rate decreases due to added propagation delay
Solution Approach 1:
The patent removes the deglitching circuit that limited data rate, replacing it with a direct demodulation path that maintains high bandwidth. The bandpass filter and direct demodulator provide transient immunity without introducing the propagation delay that would reduce data transmission capacity.
Solution Approach 2:
The patent employs a dynamic direct demodulation architecture that can adapt to high-rate data transfer requirements. The bandpass filter and demodulator are designed to maintain performance across varying data rates, enabling the system to achieve both transient immunity and high productivity simultaneously.
3Reliability
If conventional isolation techniques are used, then isolation barrier protection is achieved, but power consumption increases
Solution Approach 1:
The patent replaces conventional high-power isolation techniques with a low-power bandpass filter and direct demodulator architecture. This substitution achieves the same isolation barrier protection function through efficient signal processing, dramatically reducing power consumption while maintaining reliability.
Solution Approach 2:
The patent changes the operating parameters of the isolation system by using bandpass filtering and direct demodulation, which operate at lower power levels compared to conventional techniques. This parameter change enables ultra-low power channel operation while maintaining isolation barrier protection.
4Reliability
If conventional isolation techniques are used, then isolation barrier protection is achieved, but electromagnetic interference increases
Solution Approach 1:
The patent replaces conventional isolation techniques that generate electromagnetic interference with a bandpass filter and direct demodulator system. This substitution reduces electromagnetic interference by using frequency-selective filtering and synchronous detection, which are inherently more immune to EMI and generate less interference themselves.
Solution Approach 2:
The patent creates an electromagnetically inert environment through bandpass filtering and direct demodulation, protecting the isolation barrier from electromagnetic interference. The bandpass filter acts as a selective gate, allowing only the desired frequency band to pass through while blocking interfering signals, effectively creating a shielded communication channel.
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
This approach achieves low power consumption and enhanced common mode transient immunity, allowing for data-rate scalable and ultra-low power channel operation while reducing electromagnetic interference.
Implementation Method 1
a bandpass filter circuit configured to receive a received signal on the differential pair of input terminals and to provide a received differential signal on a differential pair of nodes
Implementation Method 2
a demodulator directly coupled to the bandpass filter circuit and configured to directly demodulate the received differential signal on the differential pair of nodes to provide a demodulated received signal
Implementation Method 3
a data-edge-encoded signal generated using an LC oscillator circuit
Data Source
AI summary
An apparatus for communicating across an isolation barrier includes a differential pair of input terminals. The apparatus includes a bandpass filter circuit configured to receive a received signal on the differential pair of input terminals and to provide a received differential signal on a differential pair of nodes. The apparatus includes a demodulator directly coupled to the bandpass filter circuit and configured to directly demodulate the received differential signal on the differential pair of nodes to provide a demodulated received signal.