RF Probe Card Performance Analysis via Power Ratio Measurement
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Solution Overview
Problem
Current metrology tools cannot effectively measure the RF performance of probe cards, which is crucial for assessing the radio frequency characteristics of semiconductor devices, especially as these devices are increasingly used in high-frequency applications.
Innovation Solution
A system comprising a signal generator, a sensor, and a processing element that inputs RF test signals into the probe card, measures the magnitude of the transmitted signal, and evaluates the RF characteristics by determining the ratio of input power to transmitted power across various frequencies, allowing for continuous monitoring and comparison to calibration values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional metrology tools are used to measure probe card RF performance, then measurement capability is limited, but the ability to assess RF characteristics is insufficient
Solution Approach 1:
The patent introduces an intermediary measurement system comprising a signal generator, power sensor, and processing element that mediates between the probe card and conventional metrology tools. This intermediary system enables RF performance measurement by generating test signals, measuring transmitted power, and calculating RF characteristics without requiring direct connection to conventional metrology equipment, thereby resolving the contradiction between measurement capability and assessment reliability.
2Measurement precision
If RF test signals are input into the probe card to measure transmitted signal magnitude, then RF characteristics can be evaluated, but measurement complexity increases
Solution Approach 1:
The patent extracts only the essential measurement function from complex RF measurement systems. By using a simple power sensor to measure transmitted signal magnitude and a processing element to calculate RF characteristics from power ratios, the system achieves accurate RF evaluation without the complexity of full vector network analyzers or sophisticated measurement setups.
Solution Approach 2:
The patent replaces complex electromagnetic field measurements with simpler power ratio measurements. Instead of using complicated impedance measurement systems or field probes, the invention uses power sensors to measure input and transmitted power, then substitutes these mechanical/electrical measurements to derive RF characteristics such as insertion loss and return loss.
3Reliability
If continuous monitoring of RF characteristics is implemented, then compliance with requirements can be ensured, but measurement time and resource consumption increase
Solution Approach 1:
The patent implements preliminary calibration by measuring reference power levels and establishing baseline RF characteristics before actual production testing. This preliminary action allows subsequent measurements to be performed more quickly by comparing against pre-established reference values, ensuring compliance without requiring full repeated characterization each time, thus reducing measurement time while maintaining reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables reliable and reproducible measurement of RF characteristics of probe cards, facilitating the identification of deviations and ensuring compliance with requirements, thereby improving the testing and maintenance of semiconductor devices.
Implementation Method 1
a signal generator (20) that generates a radio frequency test signal and that inputs the radio frequency test signal into the probe card (10)
Implementation Method 2
a sensor (13) that is connected to a terminal (16) of the probe card (10) and that receives a transmitted signal in response to the inputted radio frequency test signal
Data Source
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AI summary
A system (1) for analyzing a probe card (10) comprises a signal generator (20) adapted to generate a radio frequency test signal. a connector (25) for inputting into the probe card (10) the radio frequency test signal, and a detector assembly (3). The detector assembly (3) comprises an RF chuck (14) for receiving a radio frequency signal from the probe card (10), and a sensor (13) configured to receive the radio frequency signal from the RF chuck (14). The sensor (13) is configured to measure a magnitude of the radio frequency signal and to output a measurement signal that represents only the magnitude of the radio frequency signal. The RF chuck (14) and the sensor (13) are mechanically coupled.