Programmable Power Splitter Circuit for Doherty PA Efficiency
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Solution Overview
Problem
Doherty power amplifiers in wireless infrastructure base stations suffer from inefficiencies due to losses in the splitter circuit, which negatively impact the output performance.
Innovation Solution
A programmable splitter circuit using reactive components and isolation resistors/inductors to absorb reflected power, providing adjustable power-split ratios and phase differences to optimize efficiency across varying load conditions and signal peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed power splitter is used in Doherty PA, then the circuit structure is simple, but power efficiency deteriorates under varying load conditions due to losses
Solution Approach 1:
The patent applies dynamics by making the power splitter reconfigurable through programmable capacitive elements that can adjust their impedance values dynamically. This allows the splitter to adapt its power division ratio based on operating conditions, transforming a static component into a dynamic one that optimizes efficiency across varying load conditions while maintaining reasonable circuit complexity through controlled reconfigurability.
Solution Approach 2:
The patent implements parameter changes by modifying the capacitance values of programmable capacitive elements in the splitter circuit. By changing these electrical parameters programmatically, the power division ratio and impedance characteristics are adjusted to match different operating conditions, thereby reducing energy losses without requiring complete circuit redesign.
2Loss of energy
If a programmable splitter circuit is used to optimize power efficiency, then power efficiency improves, but device complexity increases
Solution Approach 1:
The power splitter is designed with programmable capacitive elements that enable dynamic reconfiguration of power division ratios. This dynamic capability allows the circuit to adapt to varying operating conditions and optimize efficiency, while the programmable nature provides controlled complexity rather than uncontrolled complexity increase.
Solution Approach 2:
The programmable splitter circuit serves multiple functions: it acts as a power divider, an impedance matching network, and a tunable filter. By integrating these functions into a single reconfigurable structure, the patent reduces the need for separate components, thereby managing overall device complexity while achieving improved power efficiency across diverse operating scenarios.
3Reliability
If isolation resistors are added to absorb reflected power, then reliability improves, but loss of energy increases due to resistive dissipation
Solution Approach 1:
The patent applies local quality by placing isolation resistors specifically at locations where reflected power needs to be absorbed, rather than using resistors throughout the entire circuit. This targeted approach provides reliable isolation and protects against reflected power effects only where necessary, minimizing unnecessary resistive losses in other parts of the circuit while maintaining overall reliability.
Data Source
AI summary
A device includes a splitter circuit including a first port configured to receive an input signal, a second port configured to provide a first output signal, and a third port configured to provide a second output signal. The splitter circuit includes an inductor including a first terminal coupled to the first port and a second terminal coupled to ground, a first capacitor circuit including a first terminal coupled to the first port and a second terminal coupled to the second port, a second capacitor circuit including a first terminal coupled to the first port and a second terminal coupled to the third port, and an isolation impedance coupled between the second port and the third port. The first capacitor circuit and the second capacitor circuit are programmable to provide a selected power-power split ratio between the first output signal and the second output signal.