Amplifier circuit
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Solution Overview
Problem
4th and 5th generation mobile communication systems require a compact amplifier circuit capable of operating in differential, balanced, and Doherty amplification modes depending on power supply voltage and load variations.
Innovation Solution
The amplifier circuit includes a combiner circuit with transformers and switches that allow phase shifting and switching configurations to operate in differential, balanced, and Doherty modes, utilizing first and second amplifiers with phase shifters and resistance elements to stabilize power supply and bias voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate amplifier circuits are used for differential, balanced, and Doherty modes, then each mode can be optimized independently, but the overall device size and complexity increase
Solution Approach 1:
The patent implements a single amplifier circuit that can operate in multiple amplification modes (differential, balanced, and Doherty) by using reconfigurable circuit elements. The combiner circuit includes switches that can be configured to achieve different connection topologies, allowing the same hardware to perform multiple functions. This eliminates the need for separate amplifier circuits for each mode, reducing device size while maintaining mode-specific optimization capabilities.
Solution Approach 2:
The patent employs dynamic reconfiguration of the amplifier circuit through switches (SW1, SW2, SW3) that can change the circuit topology based on the desired operating mode. By dynamically switching between different connection configurations, the circuit adapts its characteristics to optimize performance for differential, balanced, or Doherty amplification as needed, rather than being fixed in a single configuration.
2Device complexity
If a single amplifier circuit is used for all modes, then device size is reduced, but the ability to optimize each mode independently is lost
Solution Approach 1:
The combiner circuit is designed as a universal structure that can support multiple amplification modes through reconfiguration. The same physical components (transformers T1, T2, T3, switches SW1, SW2, SW3) are used across all modes, but their connection topology changes to provide mode-specific optimization. This allows the single circuit to achieve the performance characteristics of dedicated circuits for each mode.
Solution Approach 2:
The circuit incorporates dynamic switching capabilities that allow it to adapt its configuration for optimal performance in each mode. The switches enable the circuit to transition between differential mode (with 180° phase difference), balanced mode (with 90° phase difference), and Doherty mode configurations, ensuring each mode receives the appropriate circuit characteristics for optimization.
3Ease of manufacture
If fixed connection configurations are used in the combiner circuit, then circuit design is simplified, but adaptability to different amplification modes is reduced
Solution Approach 1:
The combiner circuit uses switches (SW1, SW2, SW3) to enable dynamic reconfiguration between different connection topologies. This allows the circuit to adapt to different amplification modes (differential, balanced, Doherty) while maintaining a relatively simple base design. The switching mechanism adds minimal complexity to achieve high adaptability across multiple operating modes.
Solution Approach 2:
The combiner circuit is divided into modular sections with individual switches controlling specific connection paths. This segmentation allows independent control of different signal paths, enabling flexible reconfiguration for various modes while keeping each individual switch and its associated components relatively simple. The modular approach facilitates ease of manufacture while providing versatility.
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 circuit achieves a compact design that can operate efficiently in multiple amplification modes, improving noise removal, load resistance, and efficiency across varying power levels.
Implementation Method 1
a first transformer (21) including a first input-side coil (211) and a first output-side coil (212); a second transformer (22) including a second input-side coil (221) and a second output-side coil (222)
Data Source
AI summary
An amplifier circuit includes first and second amplifiers, first and second input-side coils, first and second output-side coils, a resistance element, a first switch including first to fourth terminals, and a second switch including fifth to seventh terminals. The first input-side coil is connected between the first amplifier and the first terminal, the second input-side coil is connected between the second amplifier and the third terminal, the first output-side coil is connected between a signal output terminal and the second terminal, the second output-side coil is connected between the fifth terminal and the fourth terminal, and the resistance element is connected between the sixth terminal and the ground.