RF Power Amplifier Output Network Using Lumped Wideband Lines
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Solution Overview
Problem
Radio frequency power amplifiers require high-cost substrates and large-area printed circuit boards to achieve miniaturization and high efficiency, which is not conducive to their development in high-power applications.
Innovation Solution
The use of capacitors and inductors to form output circuits with specific electrical lengths in a radio frequency power amplifier, eliminating the need for high-cost substrates and large-area printed circuit boards by integrating these components into a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission line structure is used to achieve wideband characteristics, then bandwidth is improved, but cost and area increase
Solution Approach 1:
The patent replaces the traditional transmission line structure (mechanical/physical layout on PCB) with an electrical equivalent circuit model consisting of capacitors and inductors. This substitution allows the same wideband functionality to be achieved through electrical component relationships rather than physical transmission line geometry, thereby reducing PCB area requirements while maintaining bandwidth performance
Solution Approach 2:
The patent transforms the design parameters from physical transmission line dimensions (length, width, substrate properties) to electrical component values (capacitance, inductance). By changing the design space from geometric parameters to electrical parameters, the system achieves wideband characteristics through component selection rather than layout optimization, reducing the required PCB area
2Adaptability or versatility
If transmission line structure is used to achieve wideband characteristics, then bandwidth is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces the complex transmission line structure (requiring specialized high-cost substrates) with a simplified equivalent circuit using standard capacitors and inductors. This substitution eliminates the need for expensive substrate materials and complex fabrication processes, reducing manufacturing cost while achieving the same wideband performance through conventional components
Solution Approach 2:
The patent uses standard, inexpensive capacitor and inductor components instead of expensive specialized transmission line substrates. These conventional components are widely available, easier to manufacture, and can be replaced more easily if needed, thereby reducing both initial manufacturing cost and long-term system cost
3Adaptability or versatility
If transmission line structure is used, then wideband characteristics are achieved, but device size increases
Solution Approach 1:
The patent replaces the physical transmission line structure (occupying significant PCB space) with an electrical equivalent circuit model. This substitution compresses the functional requirements into smaller electrical components (capacitors and inductors) that achieve the same wideband effect through their electrical properties rather than physical dimensions, thereby reducing overall device size
Data Source
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AI summary
Disclosed are a radio frequency power amplifier and a wireless signal transmitting system. The radio frequency power amplifier includes a first amplifying branch, comprising a first transistor and a first output circuit; and a second amplifying branch, comprising a second transistor and a second output circuit, wherein the first output circuit comprises a line with an electrical length of 50 degrees to 90 degrees formed based on capacitors and inductors, and the second output circuit comprises a line with an electrical length of 120 degrees to 180 degrees formed based on capacitors and inductors.