Multiplexer Node Resetting to Suppress Parasitic Capacitance
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Solution Overview
Problem
Existing multiplexers in high-speed data transmission are affected by parasitic capacitance, leading to jitter and inter-symbol interference, which cause attenuation or distortion in output signals.
Innovation Solution
A multiplexer device with selection circuits and potential setting circuits that reset the internal node potential to a preset voltage when switching signals, preventing the output from being disturbed by parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal switching is performed in existing multiplexer, then signal routing function is achieved, but parasitic capacitance causes jitter and inter-symbol interference leading to signal attenuation or distortion
Solution Approach 1:
The patent applies preliminary action by resetting the potential of internal nodes to a predetermined voltage before signal switching occurs. The control circuit detects the switching timing and proactively adjusts node potentials, preventing parasitic capacitance accumulation before it can cause jitter or inter-symbol interference. This advance preparation eliminates the harmful effects rather than reacting to them after they occur.
Solution Approach 2:
The patent changes the electrical parameter (potential/voltage) of internal nodes dynamically during operation. By adjusting node potentials to predetermined values based on switching signals, the system modifies the electrical state to prevent parasitic capacitance from causing signal degradation. This parameter adjustment resolves the contradiction between maintaining signal quality and eliminating parasitic effects.
2Reliability
If potential of internal nodes is maintained during signal switching, then jitter and inter-symbol interference are prevented, but additional control circuitry and complexity are introduced
Solution Approach 1:
The control circuit performs multiple functions: it detects switching timing, determines which nodes require potential adjustment, and controls the adjustment process. By making the control circuit multi-functional, the patent reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving signal stability.
Solution Approach 2:
The control circuit uses the existing switching signal information to automatically determine when and where to adjust node potentials. The system serves itself by leveraging the control signals already present in the multiplexer operation, eliminating the need for external monitoring or additional sensing circuits, thus minimizing added complexity.
Data Source
AI summary
A multiplexer device includes a plurality of selection circuits and potential setting circuits. The plurality of selection circuits respectively receive a first data signal and a second data signal, and select a corresponding one of the first data signal and the second data signal as an output signal according to the first selection signal. When the second data signal is selected as the output signal, the potential setting circuit sets a potential of a node of a first selection circuit of the plurality of selection circuits to a first voltage. The first selection circuit is configured to receive a first data signal.