Bus Transceiver Waveform Feedback for Slew Rate and Bit Timing
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Solution Overview
Problem
Transceivers in communication networks, such as LIN, are susceptible to variations in operation due to electromagnetic interferences and changes in bus characteristics, leading to undesirable performance.
Innovation Solution
A feedback circuit provides feedback signals indicative of slew rate and bit time, allowing a data-transmission circuit to generate output signals based on these parameters, thereby compensating for bus variations and ensuring accurate data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transceivers operate in a LIN network without feedback control, then the device complexity is low, but the reliability deteriorates due to susceptibility to electromagnetic interferences and bus characteristic variations
Solution Approach 1:
The patent implements a feedback control mechanism where the transceiver measures actual slew rate and bit time parameters during operation, compares them against target values, and adjusts transmission parameters accordingly. This closed-loop feedback system compensates for electromagnetic interferences and bus characteristic variations, thereby improving reliability while managing complexity through automated adjustment rather than manual calibration
2Manufacturing precision
If the transceiver uses fixed waveform transmission, then the device complexity is low, but the manufacturing precision deteriorates due to timing deviations caused by bus impedance changes
Solution Approach 1:
The patent employs dynamic waveform adjustment where the transceiver modifies transmission waveforms in real-time based on measured bus conditions. The system adapts slew rates and timing parameters dynamically rather than using fixed waveforms, allowing precise timing control despite variations in bus impedance and component connectivity. This dynamic approach achieves manufacturing precision through automated adaptation
3Productivity
If the transceiver transmits with high slew rate, then the productivity is high, but the object-affected harmful factors increase due to electromagnetic emissions
Solution Approach 1:
The patent implements variable slew rate control where the transceiver adjusts the slew rate parameter based on measured bus conditions and feedback. Rather than operating at a fixed high slew rate, the system dynamically modifies this parameter to achieve necessary transmission speed while minimizing electromagnetic emissions. The feedback mechanism allows the transceiver to use higher slew rates only when necessary and reduce them when bus conditions permit, thereby balancing productivity with reduced harmful emissions
Data Source
AI summary
In accordance with one or more example aspects of the disclosure, communications are effected on a bus using bit time and slew rate feedback. As consistent with one or more embodiments, communications are effected in a network including a master circuit and a plurality of slave circuits, on bus that is controlled by the master circuit corresponding to master and slave data communication. A feedback signal is provided, which is indicative of a slew rate and bit time of signals communicated between the master and slave circuits on the bus. Data is transmitted on the bus by generating output signals via a waveform corresponding to an input signal, and controlling the waveform based upon the slew rate and bit time indicated via the feedback signal.