Switchable Load-Line Matching Circuit for Multi-Load Power Amplifiers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing matching circuits for power amplifiers in mobile communication devices can only connect one load or signal receiver at a time and lack the ability to select specific signal lines as input and load output lines based on actual conditions.
Innovation Solution
A matching circuit with switchable load lines is developed, incorporating a filter circuit and a switch group with independent switches controlled by external signals, allowing for the selection of different load lines without increasing series loss, and integrated on a single chip for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a matching circuit has only one output load line, then the circuit structure is simple, but it cannot connect multiple loads or signal receivers at the same time
Solution Approach 1:
The single output load line is segmented into multiple independent load lines by introducing a switch group with at least two independent switches. Each switch can be independently controlled to connect to different loads, allowing the matching circuit to serve multiple loads simultaneously while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The matching circuit is transformed from a single-function circuit that serves one load to a multi-functional circuit that can connect multiple loads and signal receivers. The switch group enables the circuit to adaptively select different load lines based on actual communication scenarios, achieving universal applicability across multiple communication channels
2Adaptability or versatility
If the existing matching circuit cannot select specific signal lines, then the circuit design is simple, but it cannot adapt to actual communication scenarios
Solution Approach 1:
The matching circuit transitions from a static configuration to a dynamic one by incorporating externally controllable switches. The control terminals of the switches receive external control signals that enable real-time selection of specific signal lines and load lines according to actual communication needs, making the circuit adaptable to varying scenarios
Solution Approach 2:
External control signals serve as intermediaries between the control system and the switch group. These control signals enable the switches to select appropriate signal lines and load lines without requiring complex internal control logic within the matching circuit itself, simplifying the control mechanism while achieving adaptability
3Adaptability or versatility
If multiple switches are added to the matching circuit, then load line switching capability is improved, but series switch loss increases
Solution Approach 1:
Multiple independent switches are merged into a unified switch group structure that shares common control mechanisms and integration resources. By integrating the switches on a single chip and using shared control terminals, the overall loss is reduced compared to having separate switch circuits, while maintaining the capability to switch between multiple load lines
Data Source
AI summary
The present invention discloses a matching circuit with switchable load lines, a load line switching method and a power amplifier. The matching circuit matches the output impedance of the power amplifier, which amplifies an input signal and outputs an amplified signal. The matching circuit comprises a filter circuit and a switch group for load line selection, the output end of the filter circuit is connected to the switch group. The switch group comprises at least two independent switches, each switch independently constitutes a signal line, and each switch is configured with an external control signal to control on/off. The matching circuit provided by the invention adopts a switch group composed of at least two independent switches, and each independent switch forms a signal line to connect loads, so that multiple loads can be connected at the same time.