MOS Switch Equalization for High-Speed Signal Attenuation
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Solution Overview
Problem
High-speed data transmission in communication systems faces signal attenuation due to stray capacitance and limited on-resistance in passive switches, particularly severe for high-frequency signals.
Innovation Solution
A switch circuit incorporating an equalization module and a large-size MOS transistor, where the equalization module supplies a turning-on signal and generates a compensation signal to counteract signal attenuation by directly controlling the gate voltage of the MOS transistor, thereby reducing on-resistance and compensating for stray capacitance losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive switch is used for high-speed data transmission, then the switch function is achieved, but signal attenuation occurs due to stray capacitance and limited on-resistance
Solution Approach 1:
The patent implements a feedback mechanism where the equalization module continuously monitors the signal attenuation caused by stray capacitance and dynamically adjusts the gate voltage of the MOS transistor. This feedback loop compensates for the signal loss by modifying the transistor's on-resistance in real-time, thereby maintaining signal transmission quality without requiring a completely different switch architecture.
Solution Approach 2:
The patent changes the electrical parameters of the MOS transistor dynamically by adjusting its gate voltage through the equalization module. By varying the gate voltage, the on-resistance and capacitance characteristics of the transistor are optimized to compensate for signal attenuation, allowing the same device to maintain low attenuation across different operating conditions and frequencies.
2Loss of energy
If the on-resistance of the MOS transistor is reduced to minimize signal loss, then signal attenuation decreases, but stray capacitance effects become more significant
Solution Approach 1:
The patent makes the MOS transistor's operating parameters dynamic rather than static. The equalization module continuously adjusts the gate voltage based on the signal characteristics, allowing the transistor to adapt its on-resistance and capacitance behavior in real-time. This dynamic operation enables the system to optimize the trade-off between reducing signal attenuation and minimizing stray capacitance effects across different frequency ranges.
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
The solution effectively compensates for signal attenuation in the signal path, allowing for high-frequency signal transmission with reduced on-resistance and stray capacitance effects, enhancing system performance by eliminating the contradiction between on-resistance and stray capacitance.
Implementation Method 1
A gate of the first MOS transistor is connected to an output terminal of the equalization module... supply a turning-on signal to the first MOS transistor... generate a compensation signal for compensating an attenuation of the signal transmitted through the first MOS transistor
Data Source
AI summary
A switch circuit and a high-speed multiplexer-demultiplexer are provided. The switch circuit includes an equalization module and an MOS transistor. A gate of the first MOS transistor is connected to an output terminal of the equalization module. An input terminal of the first MOS transistor is connected to a signal source. An output terminal of the first MOS transistor is connected to a subsequent circuit. The equalization module is configured to: supply a turning-on signal to the first MOS transistor in a case that an operation signal is acquired, to turn on the first MOS transistor; and generate a compensation signal for compensating an attenuation of the signal transmitted through the first MOS transistor, and apply the compensation signal to the gate of the first MOS transistor. The switch circuit operates in response to the operation signal.