Distributed Reference Voltage Generation for Receiver Termination Mismatch
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Solution Overview
Problem
Conventional reference voltage generators in semiconductor systems do not account for variations in ground and power supply voltages between transmitter and receiver, leading to signal mismatch and degradation in signal integrity, resulting in increased data error rates and performance issues.
Innovation Solution
A system with multiple reference voltage generator units that receive unique termination voltages and a common voltage based on transmitter voltages, using resistors to generate accurate reference voltages by averaging low and high signals, thereby reducing signal mismatch and improving data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reference voltage generators use fixed ground and power supply voltages, then the circuit design is simple, but signal mismatch and data error rates increase due to voltage variations between transmitter and receiver
Solution Approach 1:
The reference voltage generator is divided into multiple independent reference voltage generator units, each generating a specific reference voltage (e.g., VREF0, VREF1, VREF2, VREF3) based on different combinations of termination voltages and common voltage. This segmentation allows each unit to handle specific voltage matching requirements independently, improving signal integrity for different signal types while maintaining modular circuit design.
Solution Approach 2:
The reference voltage generator dynamically adjusts reference voltage parameters by accepting variable termination voltages from the receiver and combining them with a common voltage from the transmitter. This parameter adaptation enables the system to compensate for voltage variations between transmitter and receiver, reducing signal mismatch and data error rates without requiring complete circuit redesign.
2Reliability
If termination circuits are distributed along the connection path, then signal reflection is reduced, but voltage variations across different termination points increase
Solution Approach 1:
Each reference voltage generator unit receives termination voltages from specific local termination circuits along the connection path and generates reference voltages tailored to those local voltage conditions. This local quality approach ensures that each reference voltage is optimally matched to its corresponding signal path, compensating for local voltage variations while maintaining overall signal integrity across the distributed termination system.
3Reliability
If multiple reference voltage generator units are used to account for voltage variations, then data error rates decrease, but circuit complexity and power consumption increase
Solution Approach 1:
Multiple reference voltage generator units share a common voltage input from the transmitter and use it in combination with their respective termination voltages to generate reference voltages. This merging approach allows the system to achieve accurate voltage matching for multiple signal paths while avoiding redundant voltage generation, thereby reducing overall power consumption compared to completely independent reference voltage generators.
Data Source
AI summary
A system including a plurality of transmission lines, a transmitter outputting respective signals to each of the plurality of transmission lines, a receiver receiving each of the plurality of signals via respective transmission lines, the receiver including a connection path connected to a termination voltage, a plurality of termination circuits distributed along the connection path, each termination circuit receiving a unique termination voltage from the connection path, receiving a respective signal and outputting a terminated input signal, a reference voltage generator including multiple reference voltage generator units connected to a common voltage, each reference voltage generator unit uniquely receiving at least one unique termination voltage and outputting a reference voltage, and a plurality of data input buffers receiving respective signals and an appropriate reference voltage of the multiple reference voltages output from the reference voltage generator.