AC Coupled Transmission Device Stabilization Control
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Solution Overview
Problem
Conventional AC-coupled transmission devices take longer to stabilize the amplitude of the output signal, leading to delayed start of valid data transmission due to larger capacitance or terminating resistance, and reducing capacitance compromises stability.
Innovation Solution
A transmission device with an internal resistor and a control unit that supplies varying potentials to the resistor from initialization to stabilization, utilizing a timing supply unit to manage the potential stabilization period, allowing differential serial data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance of the capacitor in the transmission path is increased, then the stability of the transmission is improved, but the time required for the amplitude of the output signal to stabilize increases
Solution Approach 1:
The invention applies preliminary action by initializing the output terminal to a predetermined potential before actual data transmission begins. This preliminary potential setting allows the capacitor to start charging from a known state, reducing the stabilization time while maintaining transmission stability. The control unit manages this initialization process to ensure the amplitude stabilizes quickly without compromising reliability.
2Loss of time
If the capacitance of the capacitor is reduced, then the time required for the amplitude of the output signal to stabilize is shortened, but the stability of the transmission is deteriorated
Solution Approach 1:
The invention changes the parameter of the output terminal potential from an undefined state to a predetermined initial value before transmission. This parameter change allows the system to achieve faster stabilization with smaller capacitance values while maintaining stability through controlled potential transitions. The control unit monitors and manages these parameter changes to ensure reliable transmission.
3Reliability
If the terminating resistance in the transmission path is increased, then the stability of the transmission is improved, but the time required for the amplitude of the output signal to stabilize increases
Solution Approach 1:
The invention applies preliminary action by setting the output terminal to a predetermined potential before data transmission. This preliminary action works in conjunction with the terminating resistance to establish a stable voltage divider relationship from the outset, allowing the capacitor to charge more quickly without compromising the stability provided by the terminating resistance.
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 shortens the stabilization time for valid data transmission while maintaining stability, enabling faster initiation of data transfer without the need for additional circuitry.
Implementation Method 1
AC coupling is a method of connecting a transmission device and a reception device by a transmission path in which a capacitor is inserted
Implementation Method 2
an internal resistor having one end connected to an output terminal connected to a capacitor
Data Source
AI summary
In a transmission device connected by AC coupling, time taken before the start of transmission of valid data is shortened. The transmission device includes an internal resistor, an internal circuit, and a transmission-side control unit. One end of the internal resistor is connected to an output terminal connected to a capacitor. The internal circuit supplies one of a plurality of potentials different from each other to another end of the internal resistor. The transmission-side control unit performs control to supply one of the plurality of potentials to the internal circuit over a period from time when a potential of the output terminal is initialized to a predetermined initial value to timing when the potential of the output terminal reaches a predetermined specified value.