Bus Transceiver Gate-Voltage Control for Dominant Edge Delay
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Solution Overview
Problem
In communication systems like CXPI, there is a delay in changing the signal level on the transmission path from a recessive level to a dominant level, which can lead to non-compliance with communication protocols, especially when noise removal filters are used.
Innovation Solution
A communication apparatus is designed with a switching element, a driving circuit, and a control circuit that detects the edge at which the signal level changes and instructs the driving circuit to turn on the switching element, thereby shortening the delay time by performing voltage control to increase the gate voltage of the transistor to a threshold voltage lower than the initial threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noise removal filters are used to improve signal quality, then reliability is improved, but delay time increases causing protocol non-compliance
Solution Approach 1:
The control circuit performs preliminary action by detecting the edge in advance and activating the driving circuit before the switching element is actually needed to change the signal level. This preliminary detection and activation compensates for the delay introduced by noise removal filters, ensuring the signal level changes at the correct time to maintain protocol compliance while still using the filters for signal quality improvement
2Productivity
If the switching element is turned on quickly to reduce delay time, then productivity is improved, but emission deterioration risk increases
Solution Approach 1:
The control circuit performs preliminary detection of the edge and activates the driving circuit in advance, allowing the switching element to be turned on at the appropriate time without requiring excessively fast switching that would cause emission deterioration. The preliminary action ensures timely signal level changes while maintaining safe switching speeds
Solution Approach 2:
The driving circuit controls the gate voltage of the switching element to optimize the switching characteristics. By adjusting the gate voltage parameters, the circuit achieves fast enough switching to reduce delay time while maintaining switching speeds that do not cause emission deterioration, thus resolving the contradiction between productivity and harmful emissions
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 configuration effectively shortens the delay time, ensuring compliance with communication protocols even when noise removal filters are used, while also reducing the risk of emission deterioration.
Implementation Method 1
a switching element setting a signal level on the transmission path to a dominant level by being turned on
Implementation Method 2
performing voltage control to increase the gate voltage of the transistor to a threshold voltage lower than the initial threshold
Data Source
AI summary
A communication apparatus is one of a plurality of communication apparatuses included in a communication system where a first communication apparatus transmits data via a transmission path in synchronization with communication by a second communication apparatus. The communication apparatus includes a switching element setting a signal level on the transmission path to a dominant level by being turned on; a driving circuit driving the switching element. and a control circuit giving an on command that instructs the driving circuit to turn the switching element on in response to an edge at which a signal level on the transmission path changes from a recessive level to a dominant level being detected. The driving circuit or the control circuit is further configured to shorten a delay time from when the edge is detected to when the switching element is turned on.