Passive MIC Resistor Network for ODVS Signal Isolation
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Solution Overview
Problem
Existing high-speed multiwire communication systems face challenges with signal dynamic range and common mode rejection in orthogonal differential vector signaling (ODVS) codes, particularly with active Multi-Input Comparator (MIC) embodiments that rely on active circuit components.
Innovation Solution
A passive interconnected resistor network is used to sum input terms of the ODVS code before active detection, reducing detrimental effects of common mode signal variation and enhancing dynamic range, while also providing robust Electrostatic Discharge (ESD) protection and configurable operating modes for sufficient isolation between high and low amplitude signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active Multi-Input Comparator (MIC) embodiments are used, then detection capability is provided, but signal dynamic range is limited and common mode rejection is degraded
Solution Approach 1:
A passive resistor network is introduced as an intermediary between the ODVS code inputs and the active MIC. This passive network sums the input terms before they reach the active detection stage, thereby isolating the active components from the detrimental effects of common mode signal variation and enhancing the overall dynamic range while maintaining detection capability.
2Reliability
If passive resistor network is used to sum input terms, then dynamic range and common mode rejection are improved, but device complexity increases
Solution Approach 1:
The passive resistor network performs multiple functions simultaneously: it sums the input terms of the ODVS code, provides ESD protection, and enables configurable operating modes. By merging these functions into a single passive network, the overall device complexity is managed more efficiently despite the added components.
Solution Approach 2:
The passive resistor network is designed to serve multiple purposes: signal summation, ESD protection, and mode configuration. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby mitigating the increase in device complexity.
3Reliability
If ESD protection is enhanced, then reliability is improved, but bandwidth of receiver is reduced
Solution Approach 1:
The ESD protection function is segmented and distributed across multiple passive resistor elements within the resistor network rather than using a single bulky protection circuit. This distributed approach provides robust ESD protection while minimizing the impact on receiver bandwidth by reducing the overall capacitance and impedance introduced by the protection mechanism.
Data Source
AI summary
Dual mode T-switches driven by at least one low-impedance switch driver, to connect at least four wires of a multiwire bus to a multi-input comparator (MIC) of a plurality of MICs in a first mode of Orthogonal Vector Signaling operation, and in a full-duplex mode of operation, using the low-impedance switch driver to disable a corresponding subset of T-switches to selectively disconnect a pair of wires of the multiwire bus from the MIC while using low-impedance enable signal paths in the low-impedance switch drivers to shunt capacitively-coupled interfering outbound signals received at the MIC from the selectively disconnected pair of wires in the full-duplex mode of operation.