Differential Current Transmission With I-V Conversion for Low-Power Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional differential current driving type data transmission systems face issues with high power consumption, signal distortion due to noise interference, reduced transmission speed, and complex circuitry, which affect signal sensitivity and layout margin.
Innovation Solution
A differential current driving type transmission system that includes a transmitter with a current source block and transmission controller for controlling current on transmission lines, and a receiver with a current mirror and I-V converter to generate and amplify voltage differences, reducing power consumption and signal interference while maintaining high sensitivity and layout efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage difference is enlarged by supplying more current to the transmission line, then the transmission signal quality is improved, but power consumption increases and electromagnetic interference increases
Solution Approach 1:
The patent changes the fundamental transmission parameter from voltage-driven to current-driven mode. By supplying different current magnitudes representing logic levels (0 or 1) and using current mode logic circuits throughout the transmission system, the patent achieves reliable signal transmission without requiring high power consumption associated with voltage amplification
2Reliability
If the transmission current is increased to minimize signal deterioration, then the transmission signal quality is improved, but electromagnetic interference between transmission lines increases
Solution Approach 1:
The patent transitions from voltage mode to current mode operation, using controlled current magnitudes to represent data. Current mode logic inherently provides better isolation between transmission lines, reducing electromagnetic interference while maintaining signal integrity through the use of current mirrors and current steering mechanisms
3Measurement precision
If a high quality amplifier is used to amplify the voltage difference, then signal sensitivity is improved, but the circuit complexity increases and layout margin is degraded
Solution Approach 1:
The patent replaces the mechanical/electrical amplification approach with a current mode detection approach. Instead of using voltage amplifiers to boost weak signals, the system uses current mirrors and transconductance amplifiers that naturally provide high gain through their operating principles, achieving signal sensitivity without the complexity of additional amplification stages
Solution Approach 2:
The patent changes the detection parameter from voltage to current. By measuring current differences directly at the receiver using current mirrors, the system achieves high sensitivity without requiring complex voltage amplification circuits, thereby simplifying the overall receiver design and improving layout flexibility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces power consumption, minimizes signal deterioration from line interference, maintains high transmission speed, and enhances signal sensitivity with a simpler receiver design, providing a greater layout margin.
Implementation Method 1
a current mirror means for mirroring each currents on first and second lines of a transmission line pair to generating each mirrored current
Implementation Method 2
an I-V converter circuit for converting a current difference into the voltage difference
Data Source
AI summary
There is provided a differential current driving current type transmission system. The system includes a transmission line pair for transmitting a signal by a differential scheme; a transmission unit having a transmission circuit for making the transmission line pair have a current difference according to a logic value of a transmission signal and equalizing the transmission line pair at a predetermined timing, and a transmission controller for controlling the signal transmission of the transmission circuit and the equalization of the transmission line pair; and a receiving unit having an I-V converter circuit for mirroring a current difference of the transmission line pair and converting the current difference into a voltage difference, and a differential amplifier for amplifying the voltage difference of the I-V converter circuit.