Transmission Driver IC Bypass Circuit for Differential Bus Distortion
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Solution Overview
Problem
In conventional bus systems that transmit differential signals through pairs of lines, impedance mismatch leads to communication line currents flowing into termination resistors, causing voltage generation and distortion of communication waveforms, which can result in communication failures.
Innovation Solution
The bus system incorporates a transmission driver IC with a bypass circuit controlled by an internal signal trigger, redirecting communication line currents away from termination resistors into bypass circuits, thereby reducing excess current flow into the resistors and minimizing waveform distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If termination resistors are connected between communication lines to handle reflection currents, then communication line stability is improved, but waveform distortion increases due to voltage generation across the resistors
Solution Approach 1:
The patent introduces a bypass circuit as an intermediary component parallel to the termination resistor. This bypass circuit provides an alternative path for communication line currents, allowing them to flow through the bypass rather than through the termination resistor. The bypass circuit acts as a mediator that diverts the harmful currents away from the termination resistor, preventing voltage generation and waveform distortion while maintaining communication line stability.
2Device complexity
If impedance matching is not achieved between signal transmission and reception, then device complexity is reduced, but communication line currents cause waveform distortion
Solution Approach 1:
The patent converts the harmful communication line currents caused by impedance mismatch into a beneficial effect. Instead of allowing these currents to flow through the termination resistor and cause distortion, the bypass circuit provides a controlled path that utilizes these currents to maintain communication line stability. The harmful reflection currents are transformed into a manageable flow that can be directed away from the termination resistor, converting a harmful phenomenon into a controlled feature of the system.
Data Source
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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.