Variable Low-Pass Filter Layout for Multi-Band Tracker Modules
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing PA circuits face challenges in achieving both low loss and favorable attenuation characteristics across multiple communication bands due to the use of a common low pass filter with uniform characteristics.
Innovation Solution
A tracker module with a variable low pass filter, comprising a first block separate from the tracker and a second block integrated with the tracker, allows for varying cutoff frequencies, enabling efficient power supply voltage management across different communication bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common low pass filter with uniform characteristics is used to supply power supply voltage to a power amplifier supporting multiple communication bands, then the device complexity is reduced, but it becomes difficult to achieve both low loss and favorable attenuation characteristics in all communication bands
Solution Approach 1:
The patent applies dynamics by making the low pass filter characteristics variable rather than fixed. The cutoff frequency of the low pass filter is made adjustable to match different communication bands, allowing the filter to adapt its attenuation characteristics dynamically. This resolves the contradiction by enabling a single filter structure to serve multiple bands with different requirements through variable parameters.
Solution Approach 2:
The patent changes the parameter of the low pass filter, specifically the cutoff frequency, to optimize performance for different communication bands. By adjusting this parameter, the filter can achieve favorable attenuation characteristics for each band while maintaining a unified filter structure, thus resolving the contradiction between device complexity and adaptability.
2Ease of manufacture
If a common low pass filter with uniform characteristics is used across multiple communication bands, then the manufacturing and design are simplified, but it results in high loss in some communication bands
Solution Approach 1:
The patent makes the filter characteristics dynamic by allowing the cutoff frequency to be adjusted according to the operating communication band. This enables the filter to maintain low loss characteristics across different bands by optimizing its parameters for each band, while still using a single filter implementation that can be manufactured with standard components.
Solution Approach 2:
The patent changes the filter parameters, specifically the cutoff frequency, to minimize power loss in each communication band. By adjusting this parameter based on the operating band, the filter achieves optimal performance with reduced energy loss while maintaining ease of manufacture through a unified filter design.
3Device complexity
If a common low pass filter with uniform characteristics is used for multiple communication bands, then the system configuration is simplified, but it fails to achieve favorable attenuation characteristics in all bands
Solution Approach 1:
The patent applies dynamics by enabling the low pass filter to adapt its characteristics dynamically based on the active communication band. This allows a simplified system configuration with a single filter to achieve reliable attenuation performance across multiple bands by adjusting the filter's cutoff frequency to match each band's requirements.
Solution Approach 2:
The patent changes the filter parameters, specifically the cutoff frequency, to ensure favorable attenuation characteristics for each communication band. This parameter adjustment enables a single filter implementation to provide reliable performance across different bands without requiring multiple dedicated filters, thus maintaining system simplicity while improving reliability.
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 achieves low loss and favorable attenuation characteristics in each communication band, enhancing the efficiency and performance of power amplifier modules and radio frequency circuits.
Implementation Method 1
a variable low pass filter disposed on a path between the tracker and the external connection terminal
Data Source
AI summary
A tracker module is provided that includes an external connection terminal, a tracker, and a variable low pass filter. The external connection terminal is connected to a power amplifier. The tracker supplies a power supply voltage to the power amplifier via the external connection terminal by using an envelope tracking method. The variable low pass filter is disposed on a path between the tracker and the external connection terminal. In the variable low pass filter, a first block includes at least one electronic component. A second block is a block that varies a cutoff frequency of the variable low pass filter. The second block is integrated with the tracker into one package. The first block is disposed separately from the tracker.