Multi-Band Output Matching Circuit for Single-Amplifier Impedance Tuning
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Solution Overview
Problem
Multi-band power amplifiers face challenges in achieving optimal impedance matching across various frequency bands, leading to inefficiencies and increased costs due to the need for separate amplifying chains and complex impedance networks.
Innovation Solution
A multi-band output matching configuration comprising a broadband output matching section, a dual-band diplexer, and a switch, such as a PIN-diode, which allows for efficient impedance matching across different frequency bands by suppressing undesired harmonics and maintaining high efficiency in both low and high frequency operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate amplifying chains are provided for different frequency bands, then impedance matching for each band is optimized, but device cost, size, and power consumption increase
Solution Approach 1:
The patent implements a single power amplifier that can operate across multiple frequency bands (e.g., 800 MHz and 1900 MHz) by using a broadband amplifier design combined with frequency-selective impedance matching networks. This universal amplifier replaces multiple separate amplifying chains, reducing device complexity while maintaining optimized impedance matching for each band through the use of switching networks and frequency-selective components.
Solution Approach 2:
The patent employs dynamic impedance matching networks that can switch between different configurations depending on the operating frequency band. Switching networks and variable impedance elements allow the system to adapt the output impedance to match the optimal values for different frequency bands, enabling a single amplifier to maintain high efficiency across multiple bands without requiring separate dedicated amplifiers for each band.
2Adaptability or versatility
If switching impedance networks are added to achieve dual-band operation, then frequency versatility is improved, but device cost and efficiency deteriorate
Solution Approach 1:
The patent divides the frequency spectrum into distinct bands (e.g., 800 MHz and 1900 MHz) and uses frequency-selective networks that are optimized for each segment. By segmenting the impedance matching function into frequency-specific networks that can be switched or selected based on the operating band, the system achieves frequency versatility while controlling the complexity of individual matching networks for each segment.
Solution Approach 2:
The patent introduces frequency-selective impedance matching networks as intermediary components between the broadband power amplifier and the load. These intermediary networks act as frequency-dependent transformers that present the optimal impedance to the amplifier for each frequency band, enabling the single amplifier to efficiently drive multiple bands without requiring complex direct coupling circuits.
3Device complexity
If a single amplifier operates over multiple frequency bands, then device simplicity is improved, but impedance matching performance deteriorates
Solution Approach 1:
The patent changes the impedance parameters of the output matching network based on the operating frequency band. By using switching networks that can reconfigure the impedance values presented to the amplifier, the system maintains optimal impedance matching for each frequency band (e.g., 50 ohms at 800 MHz, different value at 1900 MHz) even though a single amplifier serves both bands. This dynamic parameter adjustment allows the amplifier to operate efficiently across multiple bands.
Data Source
AI summary
Apparatus, methods and articles of manufacture for output impedance matching in multi-band power amplification are provided, wherein an output matching configuration comprising one or more output matching sections, a multi-band diplexer and a switch are connected to an active device.