High-Frequency Switch Module Layout for Control-Path Noise Isolation
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Solution Overview
Problem
High-frequency switch circuits in wireless communication systems suffer from noise interference, which deteriorates their high-frequency characteristics due to noise being input through the ground electrode, causing distortion in transmission signals.
Innovation Solution
Incorporating resistors with higher resistance values in series with the current paths connecting the control terminal to the switch circuit, which attenuates noise and prevents its input into the switch circuit through capacitors, thereby reducing noise modulation and harmonic distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a capacitor is connected to the control signal path to ground to filter noise from the printed circuit substrate, then noise from the substrate is reduced, but noise generated within the switch circuit is still input back through the ground electrode, deteriorating high-frequency characteristics
Solution Approach 1:
The patent segments the ground path by introducing a dedicated noise prevention ground electrode (16) separate from the main ground electrode (106). This segmentation isolates the noise generated in the switch circuit from being fed back through the capacitor and main ground path, while still providing effective grounding for noise filtering purposes.
Solution Approach 2:
The patent introduces a ground electrode (16) as an intermediary element that provides a dedicated path to ground for noise generated in the switch circuit. This intermediary ground electrode acts as a mediator that prevents noise from entering the control signal path through the capacitor, thereby protecting high-frequency characteristics while maintaining effective noise grounding.
2Device complexity
If the ground electrode is used for both substrate noise grounding and switch circuit noise grounding, then grounding is simplified, but noise from the switch circuit is input through the ground electrode to the antenna switch circuit, causing signal distortion
Solution Approach 1:
The patent divides the grounding function into two separate ground electrodes: the main ground electrode (106) for substrate noise and the dedicated noise prevention ground electrode (16) for switch circuit noise. This segmentation prevents noise from the switch circuit from being input through the capacitor to the antenna switch circuit, while maintaining relatively simple grounding implementation.
Solution Approach 2:
The patent applies local quality by providing a specific ground electrode (16) with the particular function of preventing noise from the switch circuit from entering the control signal path. This localized grounding solution addresses the specific noise issue at the control terminal without requiring complete redesign of the entire grounding system.
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 noise input to the switch circuit, improving high-frequency characteristics by converting noise to thermal energy and minimizing harmonic distortion, enhancing signal integrity and switch circuit performance.
Implementation Method 1
a resistance portion arranged to reduce noise passing through the current path
Data Source
AI summary
A high-frequency switch module includes a multi-layer substrate, and a switch circuit mounted on the multi-layer substrate. The multi-layer substrate includes a terminal through which a plurality of high-frequency signals in a plurality of frequency bands are input and output, a plurality of switch terminals, terminals to which control signals to control the switch circuit are supplied, current paths that connect the terminals to the switch circuit, and resistors that are provided on the current paths and have resistance values greater than the resistance values of the current paths. The switch circuit connects the terminal to the switch terminals corresponding to the frequency bands of high-frequency signals input and output through the terminal based on the control signals.