Concurrent RF Output Matching Filter for Intermodulation Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radio frequency (RF) power amplifiers in mobile devices face challenges in minimizing signal reflections and intermodulation products due to impedance mismatch and signal coupling between antennas, leading to inefficiencies and interference.
Innovation Solution
A module with a concurrent output matching network and filter circuit that transforms the output impedance of the power amplifier to match the antenna's input impedance while blocking unwanted signals, implemented using integrated passive device (IPD) technology, reduces intermodulation products by concurrently matching and filtering signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate output matching network and filter circuits are used, then impedance matching and signal filtering can be performed independently, but device complexity and board space increase
Solution Approach 1:
The patent combines the output matching network and filter circuit into a single integrated circuit that performs both impedance matching and signal filtering functions simultaneously. The matching network uses inductors and capacitors configured to provide both the impedance transformation from the power amplifier to the antenna and the frequency-selective filtering to block unwanted signals, thereby reducing device complexity and board space while maintaining reliable performance of both functions
Solution Approach 2:
The integrated circuit is designed to perform multiple functions: it transforms the output impedance of the power amplifier to match the antenna's input impedance, blocks unwanted signals at the antenna input, and prevents intermodulation products from re-radiating. This multi-functional design eliminates the need for separate matching and filtering components, reducing overall system complexity
2Reliability
If separate output matching network and filter circuits are used, then each function can be optimized independently, but board space and power consumption increase
Solution Approach 1:
The patent merges the filter circuit with the output matching network into a single integrated circuit. The matching network's inductors and capacitors are configured to simultaneously provide impedance transformation and frequency-selective filtering. This integration significantly reduces the board space required compared to using separate discrete filter and matching network components, while maintaining effective signal filtering performance to block unwanted signals and intermodulation products
3Adaptability or versatility
If traditional separate matching network and filter configuration is used, then design flexibility is maintained, but power consumption increases
Solution Approach 1:
The patent integrates the filter and matching network into a single circuit, reducing the number of discrete components and interconnections. This integration reduces parasitic losses and improves power efficiency by eliminating redundant components and reducing signal path losses. The circuit maintains design flexibility through adjustable component values while consuming less power than separate configurations
4Reliability
If power amplifier includes integrated output matching network, then impedance matching is achieved, but board space and device complexity increase
Solution Approach 1:
The patent combines the output matching network with the filter circuit into a single integrated circuit that performs both impedance matching and signal filtering. By sharing common inductors and capacitors between the matching and filtering functions, the design achieves effective power transfer to the antenna while minimizing the board space required, as the same components serve dual purposes rather than requiring separate dedicated components for each function
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 enhances power transfer efficiency, reduces signal interference, and minimizes board space and power consumption by integrating matching and filtering functions into a single circuit, resulting in improved RF signal transmission quality.
Implementation Method 1
concurrent output matching network and filter circuit configured to concurrently transform an output impedance of the power amplifier to an input impedance of the antenna
Implementation Method 2
concurrent output matching network and filter circuit configured to concurrently transform an output impedance of the power amplifier to an input impedance of the antenna and to block signals received by the first antenna
Data Source
AI summary
Disclosed are systems and methods related to reducing intermodulation products in an RF output signal by matching an impedance of the power amplifier to an impedance of the antenna and concurrently blocking signals having a second fundamental frequency received by the antenna when the antenna is transmitting to inhibit intermodulation products of the first and second fundamental frequencies from re-radiating from the antenna. The matching and blocking are performed concurrently by a single circuit with combined matching and blocking functionality.