Differential Receiver Termination for Stable High-Speed Data Links
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Solution Overview
Problem
Existing data transmission systems face challenges in maintaining high-speed operation while minimizing power consumption, particularly in mobile terminals, due to fluctuations in amplitude voltage on transmission lines, which affect stability and require adjustments that compromise high-density integration and impedance matching.
Innovation Solution
A data transmission apparatus with a transmitting unit and a receiving unit connected via a pair of transmission lines, utilizing a terminating resistance matched to the differential impedance of the lines, and optional switches and constant current sources to stabilize amplitude voltage and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional receiver circuits are used without terminating resistance, then device complexity is reduced, but amplitude voltage fluctuates due to transistor ON resistance and transmission line impedance variations
Solution Approach 1:
A terminating resistance is introduced as an intermediary element between the transmission line and the receiver circuit. This resistance acts as a mediator that absorbs voltage fluctuations and provides a stable reference level, eliminating the direct impact of transistor ON resistance and transmission line impedance variations on the amplitude voltage.
Solution Approach 2:
The invention changes the electrical parameter of the reception node by introducing a terminating resistance with a specific resistance value. This parameter change stabilizes the amplitude voltage by providing a fixed impedance reference, compensating for variations in transistor ON resistance and transmission line impedance.
2Productivity
If high-speed data transmission is implemented, then productivity is improved, but power consumption increases due to voltage fluctuations requiring complex compensation circuits
Solution Approach 1:
The terminating resistance serves as an intermediary that stabilizes voltage levels without requiring active compensation circuits. This passive element reduces power consumption by eliminating the need for complex voltage regulation mechanisms while maintaining high-speed data transmission capability.
3Device complexity
If transistor configurations are simplified for high-density integration, then device complexity is reduced, but amplitude voltage stability deteriorates due to ON resistance variations
Solution Approach 1:
The terminating resistance is positioned as an intermediary between the transmission line and the simplified transistor configuration. It compensates for the ON resistance variations of the simplified transistors, maintaining amplitude voltage stability without requiring complex transistor arrangements.
Solution Approach 2:
By introducing the terminating resistance with a predetermined value, the invention changes the impedance parameter at the reception node. This parameter change stabilizes the voltage amplitude despite variations in transistor ON resistance, allowing the use of simpler transistor configurations for high-density integration.
Data Source
AI summary
In data transmission apparatus, a transmission line is connected with a transmitting unit and includes a first transmission line and a second transmission line. A receiving unit is connected with the transmission line. A terminating resistance is connected between a first reception node connected with the first transmission line on a receiving unit side and a second reception node connected with the second transmission line on a receiving unit side. The transmitting unit transmits a transmission data to the receiving unit through the transmission line. The receiving unit detects a reception data corresponding to the transmission data based on an amplitude voltage as a voltage difference between the first reception node and the second reception node.