RF Probe Interface with Capacitive Compensation for Signal Loss
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Solution Overview
Problem
Conventional RF launchers fail to provide broadband and 'transparent' performance, leading to signal losses and reflections at the interface between RF probes and electronic devices on a substrate, limiting their effectiveness in RF measurement applications.
Innovation Solution
An interface with a conductive structure and a capacitive element, such as a MEMS capacitor, is used to form a compensation network that couples with the RF probe, compensating for RF parasitics by adjusting capacitance, thereby enhancing the interface's bandwidth and reducing reflection losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional RF launchers are used, then the interface structure is simple, but signal losses and reflections occur at the interface between RF probes and electronic devices
Solution Approach 1:
A compensation network comprising a capacitive element and inductive element is introduced as an intermediary between the RF probe and the electronic device. This compensation network acts as a mediator that compensates for RF parasitics and minimizes signal losses and reflections at the interface, resolving the contradiction by adding a specialized intermediate structure that improves signal transmission without significantly complicating the overall interface design
Solution Approach 2:
The patent employs adjustable capacitance and inductance values in the compensation network to optimize performance across different frequency ranges. By changing these electrical parameters, the interface can adapt to minimize signal losses and reflections at various operating conditions, achieving low loss performance without requiring a completely complex fixed structure
2Adaptability or versatility
If conventional RF launchers are used, then the device complexity is low, but broadband and transparent performance is not achieved
Solution Approach 1:
The compensation network incorporates adjustable elements that can be tuned to optimize performance across different frequency ranges. The adjustable capacitance and inductance allow the interface to adapt dynamically to various operating conditions, achieving broadband transparent performance while maintaining a relatively simple overall structure compared to fixed complex alternatives
Solution Approach 2:
By implementing variable capacitance and inductance values in the compensation network, the patent enables the interface to adapt to different frequency ranges and operating conditions. This parameter adjustability achieves broadband performance without requiring an overly complex fixed structure, as the same simple network can be optimized across frequencies through parameter changes
3Measurement precision
If a compensation network with adjustable capacitance is added, then RF parasitics are compensated and measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The compensation network is introduced as a specialized intermediary module that focuses specifically on compensating RF parasitics. By isolating this compensation function in a dedicated network rather than integrating it throughout the entire interface, the patent improves measurement accuracy while minimizing the increase in overall device complexity
Solution Approach 2:
The use of adjustable capacitance and inductance elements in the compensation network allows for precise tuning to compensate for specific RF parasitics. This targeted parameter adjustment approach improves measurement accuracy without requiring a completely complex fixed structure, as the same simple network can be optimized for different parasitic conditions through parameter changes
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 proposed solution achieves low reflection losses and high measurement accuracy across a wide frequency range, making it more suitable for broadband RF characterization of electronic devices.
Implementation Method 1
The interface additionally comprises a capacitive element for providing a compensation capacitance. The capacitive element and the first conductive structure are electrically coupled in order to form a compensation network for compensating RF parasitics.
Implementation Method 2
The capacitive element comprises a MEMS capacitor configured to receive one or more control signals for adjusting an adjustable capacitance of the MEMS capacitor.
Data Source
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AI summary
An interface (100) adapted to receive a radio frequency probe for testing an electric device that is arranged on a same substrate (199) as the interface is provided. The interface includes a first conductive structure (110) for receiving at least one probe tip of the radio frequency probe. The first conductive structure is coupled to a signal line (150) in or on the substrate that couples to the electric device. Further, the interface includes a second conductive structure (120) for receiving at least one further probe tip of the radio frequency probe. The interface additionally includes a capacitive element (140) for providing a compensation capacitance. The capacitive element and the first conductive structure are electrically coupled in order to form a compensation network for compensating radio frequency parasitics.