Pre-charged Capacitor Noise Protection for Signal Lines
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Solution Overview
Problem
In computer systems, noise introduced into high-speed, low-voltage signals can cause significant problems, and existing solutions like large capacitors affect rise and fall times, necessitating a method to provide noise protection without impacting signal integrity.
Innovation Solution
A signal transmission system comprising a first and second component, a controller, and a pre-charged capacitor, where the controller determines when the signal reaches a steady state voltage and activates a switch to couple the signal line to the pre-charged capacitor for noise protection, then decouples it before the signal transitions back, thereby protecting the signal without affecting its rise and fall times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large capacitor is included in the signal line to protect against noise, then noise protection is improved, but rise and fall times of the signal are affected
Solution Approach 1:
The capacitor is made dynamically controllable through a switch mechanism that connects or disconnects the capacitor from the signal line based on signal state. The controller activates the switch to couple the capacitor when the signal reaches steady state voltage, and deactivates it before the signal transitions again, creating a dynamic rather than static capacitance arrangement.
Solution Approach 2:
The capacitor is pre-charged to the steady state voltage before being coupled to the signal line. This preliminary charging ensures that when the capacitor connects to the signal line, it does not cause voltage drops or interfere with the signal transitions, as it already holds the appropriate voltage level.
2Reliability
If a static capacitor is always coupled to the signal line, then noise protection is provided, but signal integrity is deteriorated
Solution Approach 1:
The system transitions from a static capacitor always connected to the signal line to a dynamic arrangement where a switch controls the connection. The capacitor is only coupled to the signal line when the signal has reached steady state voltage, and is decoupled before the signal transitions again, making the capacitance dynamic and conditional rather than permanent.
Solution Approach 2:
The controller monitors the signal voltage to determine when it has reached steady state, and uses this feedback information to control the switch that connects the capacitor. This closed-loop feedback ensures the capacitor is connected at the optimal moment when it provides noise protection without interfering with signal transitions.
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
This approach effectively provides noise protection to the signal after its rise time without impacting its integrity, minimizing the effect on the signal and reducing power dissipation due to capacitance.
Implementation Method 1
a pre-charged capacitor where the first and second components are coupled by a signal line for signal transmission, the controller is coupled to the switch for activating the switch, and the switch is configured to couple the signal line to the pre-charged capacitor when activated
Data Source
AI summary
Providing noise protection in a signal transmission system that includes a first component, second component, controller, switch, and pre-charged capacitor, the first and second components coupled by a signal line, the controller coupled to the switch, the switch configured to couple the signal line to the capacitor when activated, where providing noise protection includes: determining, by the controller, that a signal transmitted on the signal line transitioned to a steady state voltage; enabling, by the controller responsive to determining that the signal transitioned to the steady state voltage, noise protection to the signal on the signal line including activating the switch thereby coupling the signal line to the pre-charged capacitor, the pre-charged capacitor providing noise protection to the signal on the signal line; and prior to the signal on the signal line transitioning from the steady state voltage, deactivating the switch, thereby decoupling the signal line from the pre-charged capacitor.