RF Front-End Matching Circuit With Switchable Multi-Band Impedance
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Solution Overview
Problem
Existing high frequency modules require high-performance low-noise amplifiers for multiple frequencies and increase the number of matching elements, making it difficult to reduce module size and achieve accurate impedance matching.
Innovation Solution
A high frequency circuit design with a switching mechanism that uses a common matching element for multiple frequency bands, reducing the number of matching elements by selectively turning on/off switches to match impedance with shared amplifiers, allowing for accurate amplification of high frequency signals across multiple frequencies in a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one low-noise amplifier is used to amplify multiple high frequency reception signals, then the number of amplifiers is reduced, but a high-performance low-noise amplifier adapted for multiple frequencies is required which increases complexity
Solution Approach 1:
The patent applies dynamics by making the impedance matching circuit adjustable through switching elements that can change the connection state of matching elements based on the operating frequency band. This allows a single low-noise amplifier to be adapted for multiple frequency bands by dynamically reconfiguring the impedance matching network, resolving the contradiction between using one amplifier and maintaining frequency adaptability.
Solution Approach 2:
The patent changes the impedance parameters of the matching circuit by selectively connecting different matching elements (inductors and capacitors) through switching elements. This parameter adjustment allows the same amplifier to operate across multiple frequency bands with proper impedance matching, solving the problem of needing high-performance multi-frequency amplifiers.
2Manufacturing precision
If a matching element is disposed in each band path, then impedance matching is optimized for each band, but the number of matching elements increases making it difficult to reduce module size
Solution Approach 1:
The patent makes matching elements serve multiple frequency bands by connecting them through switching elements. The same matching elements can be used for different bands by changing the switching state, allowing a reduced number of matching elements to achieve proper impedance matching across multiple bands, thereby reducing module size while maintaining matching accuracy.
Solution Approach 2:
The patent dynamically reconfigures the matching circuit by changing the connection state of switching elements based on the selected frequency band. This dynamic reconfiguration allows a smaller set of matching elements to provide optimized impedance matching for multiple bands, resolving the contradiction between matching accuracy and module size.
3Reliability
If multiple matching elements are used for multiple frequency bands, then impedance matching is improved, but the circuit size and complexity increase
Solution Approach 1:
The patent uses switching elements to dynamically reconfigure the matching circuit, allowing the same matching elements to serve multiple frequency bands. This dynamic approach maintains reliable impedance matching performance across bands while reducing the total number of matching elements required, thereby reducing circuit complexity.
Solution Approach 2:
The patent changes the effective impedance parameters of the matching circuit by selectively connecting different combinations of matching elements through switching elements. This parameter adjustment enables proper impedance matching for multiple frequency bands using a reduced set of matching elements, resolving the contradiction between matching performance and circuit complexity.
Data Source
AI summary
A high frequency circuit (4) includes a first terminal (40a), a second terminal (51a), a third terminal (51b), a first path, a second path, a first matching element (41) and a first amplifier (50a) both arranged in the first path, a first switch (42) connected between a reference terminal and a part of the first path, the part spanning between the first matching element and the first amplifier, a second matching element (43) and a second amplifier (50b) both arranged in the second path, and a second switch (44) connected between the reference terminal and a part of the second path, the part spanning between the second matching element and the second amplifier.