Integrated Band-Pass Filter Circuit With Shared Terminals
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Solution Overview
Problem
Existing filter circuits with multiple band-pass filters have a high number of terminals, making them complex and difficult to integrate into a single component, such as in mobile communication terminals.
Innovation Solution
A filter circuit design that connects the input and output terminals of multiple band-pass filters in a specific common terminal configuration, reducing the number of terminals and allowing for shared amplifiers, with each band-pass filter having distinct pass bands to minimize terminal count and enable efficient signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple band-pass filters are integrated into a single filter circuit, then the functionality for various communication methods is improved, but the number of terminals increases making the circuit complex
Solution Approach 1:
The patent merges multiple band-pass filters into a single integrated filter circuit where filters share common terminals. Specifically, the first and second band-pass filters share a first common terminal, while the third and fourth band-pass filters share a second common terminal, reducing the total terminal count while maintaining multiple filtering functions for different communication methods
Solution Approach 2:
The filter circuit achieves multi-functionality by enabling different combinations of band-pass filters to be activated based on communication requirements. The shared terminal structure allows the same physical circuit to serve multiple communication methods by selectively engaging different filter paths, making the circuit universal across various communication standards
Data Source
AI summary
A filter circuit includes: a first band-pass filter, a second band-pass filter, a third band-pass filter and a fourth band-pass filter each having input and output terminals; a first terminal to which one of input and output terminals of first band-pass filter and one of input and output terminals of second band-pass filter are connected; a second terminal to which one of input and output terminals of third band-pass filter and one of input and output terminals of fourth band-pass filter are connected; a third terminal to which another one of input and output terminals of first band-pass filter and another one of input and output terminals of fourth band-pass filter are connected; and a fourth terminal to which another one of input and output terminals of second band-pass filter and another one of input and output terminals of third band-pass filter are connected.