RF Switch Circuit With Variable Resistance Against Parasitic Capacitance
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Solution Overview
Problem
Conventional multiplexers experience signal attenuation and interference due to parasitic capacitance, especially in high-frequency signal transmission, leading to inefficiencies and losses.
Innovation Solution
Incorporating a switch device with a variable resistor that adjusts resistance based on control signals to minimize signal passage through parasitic capacitance, allowing high-frequency signals to bypass capacitance paths and reduce attenuation and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multiplexers are used for high-speed transmission, then the structure is simple and easy to manufacture, but signal attenuation and interference occur due to parasitic capacitance
Solution Approach 1:
The patent applies the dynamics principle by making the resistance value changeable based on the switch state. A variable resistor is introduced that dynamically adjusts its resistance value: when the switch is ON, the resistor presents high impedance to block parasitic capacitance paths; when the switch is OFF, the resistor presents low impedance to prevent signal leakage through parasitic capacitance. This dynamic adjustment resolves the contradiction by adapting the resistance value to different operational states, improving signal transmission quality without requiring a fundamentally complex switch structure.
Solution Approach 2:
The patent applies the parameter changes principle by modifying the resistance parameter of the variable resistor according to the switch state. The resistance value is changed between two states: a first resistance value (high impedance) when the switch is ON, and a second resistance value (low impedance) when the switch is OFF. This parameter change allows the system to optimize signal transmission quality in both states, reducing the technical contradiction between transmission quality and structural simplicity.
2Ease of manufacture
If the switch device is kept simple, then the manufacturing is easy, but signal losses and interferences are caused by parasitic capacitance paths
Solution Approach 1:
The patent applies the intermediary principle by introducing a variable resistor as a mediating component between the switch device and the parasitic capacitance. This intermediary element dynamically controls the impedance level to block harmful signal paths through parasitic capacitance while maintaining the simplicity of the original switch structure. The variable resistor acts as a controllable barrier that prevents signal loss without requiring complex modifications to the switch manufacturing process.
3Reliability
If variable resistor is added to control parasitic capacitance paths, then signal transmission quality improves, but device complexity increases
Solution Approach 1:
The patent applies the merging principle by integrating the variable resistor with the existing switch device structure. The variable resistor is combined with the switch in such a way that it becomes a unified component, sharing common control signals and physical space. This merging approach allows the system to achieve improved signal transmission quality while minimizing the increase in overall device complexity, as the added component is tightly integrated rather than being a separate, complex subsystem.
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 reduces high-frequency signal attenuation and interference by optimizing resistance values in relation to parasitic capacitance, improving signal transmission efficiency and reducing unwanted signal flow.
Implementation Method 1
the parasitic capacitance usually exists in a multiplexer 1, which is caused by the capacitance produces by the adjacent electronic components or the circuit modules in the circuit
Data Source
AI summary
A switch and a multiplexer including the same are provided, which are applicable to selectively transmit the high frequency signal from an input terminal to an output terminal therethrough. The switch includes a switch device and a variable resistor. The switch device is connected between the input terminal and the output terminal, and the switch device includes a control terminal and is configured to be switched between ON and OFF according to a switch controlling signal provided to the control terminal. The variable resistor is connected to the control terminal and configured to change to a first resistance while the switch device is ON, and to change to a second resistance while the switch device is OFF according to a resistor controlling signal. The first resistance is higher than the second resistance, and the resistor controlling signal is changed corresponding to the switch controlling signal.