Unpowered RF Switch Module Using DC-Biased Signal Routing
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Solution Overview
Problem
Existing wireless communication systems require powering up a separate module for multiplexing RF switches, which reduces battery life and increases costs due to the need for discrete switch control lines and control signals.
Innovation Solution
A single-pole multi-throw RF switch is implemented in an unpowered module that actively switches RF signals using a control command and associated software, eliminating the need for power and control terminals, and utilizing transistors and capacitors to output RF components based on positive DC voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate module is powered up to control multiplexing RF switches, then switch control functionality is achieved, but battery life is reduced and system cost increases
Solution Approach 1:
The RF switch module performs switching operations autonomously using the RF signal itself to control the transistor gates, eliminating the need for external power and control signals. The module serves itself by utilizing the incoming RF energy to perform both switching and control functions, thereby reducing battery consumption while maintaining full switch control functionality.
2Ease of operation
If discrete switch control lines are added to effectuate multiplexing, then switch control is achieved, but chipset size and cost increase
Solution Approach 1:
The patent extracts the control function from external control lines and integrates it directly into the RF signal path. By using the RF signal itself to control the switches through coupled transistor gates, the design eliminates the need for separate discrete control lines, thereby reducing chipset complexity while maintaining switch control capability.
Solution Approach 2:
The RF signal serves multiple functions simultaneously: it is both the signal to be switched and the control signal that actuates the switches. This multi-functionality eliminates the need for separate control lines, reducing the number of components and simplifying the overall chipset structure while maintaining full control capability.
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
This solution allows for efficient RF signal switching without powering the switching module or using control signals, reducing battery consumption and eliminating the need for discrete control lines, thereby enhancing battery life and reducing system costs.
Implementation Method 1
The switching module includes a first transistor having a drain coupled to the first input terminal via a first capacitor, a gate coupled to the first input terminal via a first resistor, and a source coupled to the output terminal
Implementation Method 2
a first transistor having a drain coupled to the first input terminal via a first capacitor, a gate coupled to the first input terminal via a first resistor
Data Source
AI summary
Unpowered switching module. A switching module can include a first input terminal, a second input terminal, and an output terminal. The output terminal can be configured to output a radio-frequency (RF) component of an input signal received on the first input terminal or the second input terminal in response to the input signal including a positive direct-current (DC) voltage.