Impedance Transformer Network for Low-Cost RF Power Reliability Tests
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Solution Overview
Problem
The high cost of load tuners in radio frequency (RF) power reliability tests increases the expense of performing RF power measurements, as they are essential for adjusting load impedance to find maximum and minimum output power points on a Smith chart.
Innovation Solution
An impedance transformation circuit with multiple impedance transformers is used to replace the load tuner, allowing the RF power measurement system to adjust impedance points on a reflection coefficient circle, enabling the spectrum analyzer to measure output power and identify maximum and minimum output power points without the need for expensive load tuners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a load tuner is used to adjust load impedance to find maximum and minimum output power points, then measurement precision is improved, but device cost increases significantly
Solution Approach 1:
The patent uses a fixed impedance transformation network that replicates the impedance transformation functionality of a load tuner through a predetermined arrangement of transformers and transmission lines. This copying approach achieves the necessary measurement capability without requiring an expensive, adjustable load tuner, thereby reducing system cost while maintaining measurement precision for identifying maximum and minimum output power points.
Solution Approach 2:
The impedance transformation function is divided into multiple discrete transformer stages with specific transformation ratios. Instead of using a single adjustable load tuner, the system segments the impedance transformation into fixed ratio stages (e.g., 1:2, 1:4, 1:8) that collectively cover the required impedance range, enabling precise measurement without the need for expensive continuous adjustment mechanisms.
2Adaptability or versatility
If a load tuner is used to adjust impedance dynamically, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic adaptability through a switched configuration of fixed impedance transformers. By using switches to selectively connect different transformer combinations, the system dynamically adjusts impedance transformation ratios to match various device under test requirements. This approach provides the necessary adaptability while avoiding the complexity of continuously adjustable load tuners, as the system only requires discrete switching between predetermined impedance states.
Data Source
AI summary
An impedance transformation circuit and a radio frequency power reliability test system are provided. The impedance transformation circuit can be used in a radio frequency power measurement system. The radio frequency power measurement system includes a signal generator, a buffer, a device under test, an attenuator, and a spectrum analyzer. The impedance transformation circuit includes a plurality of impedance transformers, which correspond to a plurality of impedance points on a reflection coefficient circle of a Smith chart, respectively. The impedance transformers are coupled between the device under test and the attenuator in turn in a radio frequency power reliability test, and the spectrum analyzer is configured to measure an output power corresponding to each of the impedance points, such that two of the impedance points respectively corresponding to a maximum output power and a minimum output power are found by the radio frequency power measurement system.