Differential Signal Ringing Suppressor With Voltage Drop Stopper
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Differential signal transmission in high/low potential pairs is prone to ringing, causing signal distortions like overshoot or undershoot, and existing methods to suppress ringing by lowering impedance between signal lines can result in excessive voltage drops, leading to communication issues.
Innovation Solution
A ringing suppressor circuit that includes a switching element, such as an N-type MOSFET, connected between signal lines to temporarily lower impedance when the signal level changes, and a stopper mechanism using a P-type MOSFET to prevent excessive voltage drops by comparing voltages and controlling the switching element's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If impedance between signal lines is lowered to suppress ringing, then ringing is suppressed, but excessive voltage drop occurs
Solution Approach 1:
The patent applies dynamics by making the impedance between signal lines variable rather than fixed. A switching element (transistor) is introduced that can dynamically change the impedance state between high and low based on control signals. This allows the system to adapt impedance to different operational conditions: low impedance when ringing suppression is needed, and high impedance when voltage level stability is prioritized, thus resolving the contradiction between these two requirements.
Solution Approach 2:
The patent changes the impedance parameter dynamically by controlling the switching element's on/off state. When the switching element is turned on, impedance between signal lines decreases to suppress ringing. When turned off, impedance returns to high state to maintain proper voltage levels. This parameter change approach allows the system to optimize for different conditions at different times, resolving the contradiction between ringing suppression and voltage stability.
2Object-affected harmful factors
If impedance is lowered continuously, then ringing is suppressed, but signal transmission accuracy deteriorates
Solution Approach 1:
The patent applies periodic action by controlling the switching element to operate in discrete on/off cycles rather than continuously. The switching element is activated for specific periods when ringing is detected or anticipated, then deactivated to restore proper signal levels. This periodic control allows temporary ringing suppression without permanently affecting signal transmission accuracy, resolving the contradiction between these two requirements.
Solution Approach 2:
The dynamic switching capability allows the system to alternate between impedance states based on signal conditions. The switching element can be rapidly switched on to suppress ringing transiently, then switched off to restore accurate signal levels for detection. This dynamic behavior enables the system to address ringing only when necessary without compromising overall signal transmission accuracy.
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
Effectively suppresses ringing and prevents excessive voltage drops during differential signal transmission, ensuring accurate communication by dynamically managing impedance between signal lines.
Implementation Method 1
lowering the impedance between the pair of signal lines
Implementation Method 2
comparing voltages and controlling the switching element's operation
Data Source
AI summary
A ringing suppressor circuit is connected to a differential signal transmission line that includes a high potential signal line and low potential signal line pair for transmitting high and low level differential signals, and includes a ringing suppressor and a stopper. When the differential signal changes to a high level, the ringing suppressor suppresses ringing by lowering the impedance between the signal lines by turning ON of a switching element. When a differential signal voltage drops below a voltage lowering determination voltage, the stopper stops the impedance lowering function of the ringing suppressor by turning OFF another switching element.