Unpowered RF Switch Module Using DC-Biased Signal Paths
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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
1Reliability
If a separate module is powered up to control multiplexing RF switches, then switching 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 an external powered controller. The module serves itself by using its own input signals to drive the switching mechanism, thereby consuming no additional battery power for control operations.
Solution Approach 2:
The control functionality is extracted from a separate powered module and integrated directly into the RF switch module. By removing the need for a dedicated control module with power consumption, the invention eliminates the harmful energy consumption while preserving the essential switching function.
2Ease of operation
If discrete switch control lines are added to effectuate multiplexing, then switching control is achieved, but chipset size and cost increase
Solution Approach 1:
The control lines are merged with the existing RF signal paths. The same physical conductors that carry RF signals are also used to provide control voltages to the transistor gates, eliminating the need for separate discrete control lines and reducing chipset complexity.
Solution Approach 2:
The RF signal lines serve dual functions: carrying the RF signal and providing control voltage for switching. This multi-functionality eliminates the need for dedicated control lines, reducing the number of components and simplifying the chipset architecture.
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
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
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.