Differential Signal Receiver Masking Common-Mode Ringing Pulses
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Solution Overview
Problem
Conventional isolated gate driver devices suffer from spurious pulses in the reconstructed signal due to common-mode ringing effects in the differential signal, which are not effectively addressed by existing solutions that require costly and area-consuming implementations of isolation capacitors in the high-voltage die.
Innovation Solution
A receiver circuit with a sensing circuit and logic circuit is introduced to sense and mask common-mode voltage signals exceeding a threshold, producing corrected set and reset signals that are free from spurious pulses, using simple logic circuitry to improve common-mode transient immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation capacitors are implemented in the high-voltage die to address common-mode ringing effects, then the reliability of signal transmission is improved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent extracts the harmful common-mode ringing component from the differential signal by implementing a sensing circuit that detects common-mode voltage and a logic circuit that generates masking signals to eliminate spurious pulses during ringing events, thereby removing the need for complex isolation capacitor implementations in the high-voltage die
Solution Approach 2:
The patent introduces an intermediary sensing circuit and logic circuit between the differential signal input and the reconstructed signal output. This intermediary mechanism detects common-mode voltage variations and applies masking to the set and reset signals, effectively mediating the harmful ringing effects without requiring complex capacitor implementations
2Reliability
If isolation capacitors are implemented in the high-voltage die to reduce spurious pulses, then the common-mode transient immunity is improved, but the area occupied and manufacturing cost increase
Solution Approach 1:
The patent replaces expensive, area-consuming isolation capacitors with a cost-effective sensing circuit and logic circuit implementation that achieves the same common-mode transient immunity function using standard logic gates and comparators, significantly reducing both area and manufacturing cost
3Device complexity
If conventional receiver circuits are used without common-mode sensing, then the device complexity is reduced, but spurious pulses appear in the reconstructed signal due to common-mode ringing
Solution Approach 1:
The patent implements a feedback mechanism where the sensing circuit continuously monitors the common-mode voltage of the differential signal and feeds this information back to the logic circuit, which then applies appropriate masking to the set and reset signals to eliminate spurious pulses caused by common-mode ringing effects
Data Source
AI summary
Provided is a receiver circuit that receives a differential signal including positive and negative spikes. A first comparator produces an intermediate set signal that includes a pulse at each positive spike of the differential signal, and a second comparator produces an intermediate reset signal that includes a pulse at each negative spike of the differential signal. A sensing circuit extracts a common-mode voltage signal from the differential signal and asserts a control signal when the amplitude of the common-mode voltage signal exceeds a threshold. A logic circuit asserts a masking signal for an interval in response to asserting the control signal and de-asserts the masking signal in response to the interval elapsing. The logic circuit produces a corrected set signal. The logic circuit produces a corrected reset signal. An output circuit generates an output signal from the corrected set signal and the corrected reset signal.