RF Circuit Reflected-Voltage Detection for Connection Failures
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Solution Overview
Problem
Existing methods for detecting connection failures in RF integrated circuits, such as ball breaks and solder joint failures, are inadequate for identifying RF-related issues, particularly in safety-critical systems like automotive radar, where traditional DC current measurements are ineffective.
Innovation Solution
A circuit and method utilizing RF signal analysis to detect connection failures by measuring reflected voltage, employing amplifiers, combiners, couplers, and power detectors to identify deviations from preset thresholds, without relying on RF switches, which are known to cause insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional DC current measurements are used for failure detection, then the measurement method is simple, but it is ineffective for identifying RF-related issues such as ball breaks and solder joint failures
Solution Approach 1:
The patent replaces traditional DC current measurement methods with RF signal-based detection. By using RF signals and measuring reflected voltage instead of DC current, the system achieves effective detection of RF connection failures such as ball breaks and solder joint failures, directly addressing the limitation of DC methods for RF-related issues
Solution Approach 2:
The patent introduces an RF signal as an intermediary to detect connection failures. The RF signal is transmitted through the connection path and the reflected voltage is measured, allowing indirect detection of connection integrity without directly measuring DC current, thereby improving detection accuracy for RF-related failures
2Reliability
If RF switches are used in the detection circuit, then the circuit can detect connection failures, but RF switches cause insertion loss that degrades signal quality
Solution Approach 1:
The patent removes RF switches from the detection circuit entirely. By extracting the problematic RF switch component, the system eliminates the source of insertion loss while maintaining connection failure detection capability through alternative circuitry that uses RF signals without requiring RF switches in the signal path
3Reliability
If multiple power detectors and switches are used to detect connection failures, then failure detection capability is improved, but the device complexity and insertion loss increase
Solution Approach 1:
The patent extracts and removes unnecessary RF switches from the detection circuit. By eliminating these components, the system reduces device complexity and insertion loss while maintaining effective connection failure detection through a simplified circuit architecture that relies on RF signal transmission and reflected voltage measurement
Solution Approach 2:
The patent creates a detection circuit that serves multiple functions without requiring multiple separate components. The same RF signal path and detection mechanism are used for both normal RF operation and failure detection, eliminating the need for separate switches and multiple power detectors, thereby reducing overall circuit complexity
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
Effectively detects subtle disruptions in RF signals, ensuring reliable operation of safety-critical systems by accurately identifying connection failures in RF circuits, including ball breaks, PCB degradation, antenna failures, and external matching element failures.
Implementation Method 1
the power detector receives a reflected voltage from the external circuitry and determines if there is a failure connection
Data Source
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AI summary
A circuit a method for testing failure of a connection between a radio frequency, RF, integrated circuit and external circuitry is described. The circuit comprising: a first amplifier having an input path and an output path; a second amplifier having an input path and an output path; a combiner for combining the signal from the output path of the first amplifier and the output path of the second amplifier; a coupler for receiving the output of the combiner; and a power detector coupled to the output of the coupler, the combiner configured to send signals to the external circuitry, wherein the power detector receives a reflected voltage from the external circuitry, and determines that there is a connection failure between the RF circuit and the external circuitry when the reflected voltage exceeds a preset threshold voltage.