Transmission Driver IC Bypass Circuit for Bus Waveform Distortion
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Solution Overview
Problem
Conventional bus systems experience communication waveform distortion due to impedance mismatch between signal transmission and reception, leading to communication failures.
Innovation Solution
Incorporation of bypass circuits and control circuits in transmission driver ICs to redirect excess communication line currents away from termination resistors, using internal signals as triggers to manage current flow through bypass paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a termination resistor is used in the bus system, then signal transmission is enabled, but communication waveform distortion occurs due to impedance mismatch
Solution Approach 1:
The patent introduces a bypass circuit as an intermediary element connected in parallel with the termination resistor. This bypass circuit provides an alternative current path that mediates between the transmission line and the termination resistor, allowing excess current to be diverted away from the termination resistor during signal transitions, thereby preventing waveform distortion while maintaining the termination resistor's signal transmission function
Solution Approach 2:
The patent segments the current path by creating a separate bypass circuit distinct from the main termination resistor path. The control circuit divides the current flow into two segments: normal signal current through the termination resistor and excess transient current through the bypass circuit. This segmentation allows each path to perform its specific function without interfering with the other
2Object-affected harmful factors
If bypass circuits are added to redirect excess current, then communication waveform distortion is suppressed, but device complexity increases
Solution Approach 1:
The control circuit is designed with multi-functionality, serving both to drive the bypass circuit during signal transitions and to generate the internal signal for reception circuit operation. The bypass circuit itself serves dual purposes: protecting against waveform distortion and providing a controlled current path. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
Data Source
AI summary
A bus system includes a first transmission driver IC, a second transmission driver IC, a first communication line and a second communication line that couple the first transmission driver IC and the second transmission driver IC, and a termination resistor coupled between the first communication line and the second communication line. Each of the first transmission driver IC and the second transmission driver IC includes a transmission circuit configured to transmit a differential signal to the first communication line and the second communication line, a reception circuit configured to convert the differential signal that is received from the first communication line and the second communication line to an internal signal, a bypass circuit coupled to the first communication line or the second communication line, and a control circuit configured to operate the bypass circuit using the internal signal as a trigger such that a communication line current flowing into the first communication line or the second communication line flows into the bypass circuit.