RF Power Amplifier Circuit With Variable Impedance Matching
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Solution Overview
Problem
Existing RF power amplifier circuits for mobile communication devices are bulky due to their complex configurations, which include multiple paths for amplifying signals across different frequency bands, leading to increased circuit size and inefficiencies in power supply over a wide frequency range.
Innovation Solution
A power amplifier circuit design that incorporates a first amplifier circuit for amplifying signals in a first frequency band and a second amplifier circuit for amplifying signals in a second frequency band, with a variable adjustment circuit to adjust impedance, allowing efficient amplification across a wide frequency range while reducing circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple amplifier circuits are used for different frequency bands, then amplification efficiency across wide frequency band is improved, but circuit size increases
Solution Approach 1:
The patent employs a single amplifier circuit that can operate across multiple frequency bands (first frequency band and second frequency band) by dynamically adjusting its impedance through the variable adjustment circuit. This multi-functional approach allows one amplifier to replace what would traditionally require multiple dedicated amplifiers, thereby reducing circuit size while maintaining broad frequency coverage and amplification efficiency.
Solution Approach 2:
The patent introduces a variable adjustment circuit that dynamically changes the impedance of the amplifier circuit based on the operating frequency band. By making the impedance adjustable rather than fixed, the system can optimize performance for different frequency bands (first and second bands) using a single amplifier circuit, thus avoiding the need for multiple static amplifier circuits and reducing overall circuit size.
2Ease of manufacture
If fixed impedance circuit is used, then circuit design is simplified, but amplification efficiency varies across frequency bands
Solution Approach 1:
The patent transforms the static impedance design into a dynamic one by incorporating a variable adjustment circuit. This circuit enables real-time impedance optimization for different frequency bands (first and second bands), allowing the amplifier to maintain high efficiency across a wide frequency range while keeping the base circuit design relatively simple through systematic impedance matching.
Solution Approach 2:
The patent changes the impedance parameter of the amplifier circuit dynamically based on the operating frequency band. By adjusting the impedance parameter to match different frequency bands, the system achieves consistent amplification efficiency across both the first and second frequency bands without requiring fundamentally different circuit designs for each band.
3Adaptability or versatility
If multiple output paths are used for different power levels, then power flexibility is improved, but circuit complexity increases
Solution Approach 1:
The patent makes the single amplifier circuit multi-functional by enabling it to operate at different power levels within both the first and second frequency bands through impedance adjustment. This eliminates the need for separate high-output and medium-output paths, reducing circuit complexity while maintaining the flexibility to deliver different power levels as needed.
Solution Approach 2:
The variable adjustment circuit dynamically adapts the amplifier's impedance to optimize performance for different power levels and frequency bands. This dynamic adaptation allows one amplifier circuit to replace multiple dedicated circuits for different power levels, reducing overall circuit complexity while preserving power flexibility.
Data Source
AI summary
A power amplifier circuit includes a first amplifier circuit configured to amplify a first signal of a first frequency band and output a first amplified signal having a first power, a second amplifier circuit configured to amplify a second signal of the first frequency band or a second frequency band different from the first frequency band and output a second amplified signal having a second power different from the first power, and a first variable adjustment circuit disposed between the second amplifier circuit and a first circuit subsequent to the second amplifier circuit, the first variable adjustment circuit being configured to be capable of adjusting a first impedance of the first circuit seen from the second amplifier circuit.