Shielding Probe Waveguide for Wafer RF Testing
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Solution Overview
Problem
During wafer stage testing of semiconductor devices, electromagnetic waves in the environment interfere with the proper RF testing of integrated circuits, leading to inaccurate results and potential defects in advanced integrated circuits.
Innovation Solution
A shielding probe is designed with conductive elements forming a shielding cage that surrounds the integrated circuit, creating waveguides to block electromagnetic waves of specific frequencies, ensuring that only desired frequencies propagate and shield the circuit from external interference during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RF testing is performed during wafer stage testing, then integrated circuit parameters can be extracted for modeling, but electromagnetic waves in the environment interfere with the proper RF testing
Solution Approach 1:
A shielding probe structure is introduced as an intermediary between the integrated circuit and the external environment. The shielding probe includes conductive elements arranged to form waveguides that selectively block harmful electromagnetic waves while allowing the integrated circuit to be tested, thus mediating the interaction between the circuit and environmental interference
Solution Approach 2:
The conductive elements of the shielding probe are configured with specific dimensions and spacing to create waveguides with particular cutoff frequencies. By changing the physical parameters (width, height, spacing) of the conductive elements, the shielding structure selectively allows desired RF frequencies to pass while blocking unwanted electromagnetic interference frequencies
2Measurement precision
If a shielding probe with conductive elements is used to block electromagnetic waves, then RF testing accuracy is improved, but device complexity increases
Solution Approach 1:
The shielding probe serves multiple functions simultaneously: it provides electromagnetic shielding, maintains the testing environment, and can be integrated with the existing probe card structure. The conductive elements are configured to provide both mechanical support and electromagnetic shielding functions, reducing the need for separate components
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
The shielding probe effectively isolates the integrated circuit from external electromagnetic waves, enhancing the reliability of RF testing by preventing interference and ensuring accurate parameter extraction, thereby improving the quality of integrated circuit testing.
Implementation Method 1
A shielding probe is designed with conductive elements forming a shielding cage that surrounds the integrated circuit, creating waveguides to block electromagnetic waves of specific frequencies
Implementation Method 2
The shielding probe effectively isolates the integrated circuit from external electromagnetic waves, enhancing the reliability of RF testing by preventing interference
Data Source
AI summary
A circuit probe includes a shielding probe having a base and a conductive probe ring on the base. A shielding cage is attached to the conductive probe ring and has an interior. The shielding cage is configured to be positioned to contain in the interior of the shielding cage at least one integrated circuit formed on a wafer, and to provide electromagnetic shielding of the at least one integrated circuit during testing of the at least one integrated circuit.