Programmable Isolator Receiver Calibration for Transient Mismatch
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Solution Overview
Problem
Isolation technologies face challenges in maintaining accurate communication across isolation barriers due to susceptibility to common mode transients, which can degrade the performance of isolation channels by causing mismatch errors and affecting the immunity to common mode transient noise.
Innovation Solution
A method and system for calibrating an isolator product that includes generating a diagnostic signal based on a calibration signal, configuring a programmable receiver signal path to compensate for mismatch in the isolation channel, and storing the configuration for normal operation, thereby improving common mode transient immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation barrier is used to prevent damaging currents, then safety is improved, but communication accuracy deteriorates due to common mode transients
Solution Approach 1:
The patent uses an isolation barrier as an intermediary element that allows signal transmission while blocking damaging currents. The barrier includes capacitive coupling elements that mediate between the high-voltage load domain and the low-voltage processor domain, enabling communication while maintaining safety isolation.
Solution Approach 2:
The patent changes the operating parameters of the isolation channel by adjusting capacitor values and resistance ratios to optimize the transfer function. By modifying these parameters, the system achieves better common mode transient immunity while maintaining communication accuracy across the isolation barrier.
2Adaptability or versatility
If isolation channel is used for communication, then connectivity is improved, but susceptibility to common mode transients worsens
Solution Approach 1:
The patent implements a feedback mechanism where the system measures the actual transfer function of the isolation channel and adjusts the capacitor values and resistance ratios accordingly. This closed-loop approach enables the system to compensate for common mode transient effects and optimize communication reliability.
Solution Approach 2:
The patent makes the isolation channel dynamic by allowing adjustment of capacitor values and resistance ratios based on operating conditions. This dynamic configuration enables the system to adapt to varying common mode transient levels and maintain optimal performance across different operating scenarios.
3Device complexity
If fixed receiver signal path is used, then device complexity is reduced, but adaptability to mismatch errors worsens
Solution Approach 1:
The patent transforms the fixed receiver signal path into a dynamic, programmable system. The receiver can be reconfigured through programming to adjust its characteristics and compensate for mismatch errors in the isolation channel, providing adaptability without requiring complex hardware changes.
Solution Approach 2:
The patent enables parameter changes in the receiver signal path through programming, allowing adjustment of gain, bandwidth, and other characteristics. This software-based parameter adjustment provides mismatch compensation capability while keeping the hardware relatively simple.
Data Source
AI summary
A method for calibrating an isolator product includes receiving a calibration signal on a differential pair of nodes of a receiver signal path of a first integrated circuit die of the isolator product. The method includes generating a diagnostic signal having a level corresponding to an average amplitude of the calibration signal on the differential pair of nodes. The method includes configuring a programmable receiver signal path based on the diagnostic signal. Generating the diagnostic signal may include providing an analog signal based on a full-wave rectified version of the calibration signal on the differential pair of nodes. Generating the diagnostic signal may include converting the analog signal to a digital signal.