High-Frequency Circuit Abnormality Detection via DC Bias Terminals
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Solution Overview
Problem
Existing high-frequency circuits for microwave to terahertz bands face challenges in detecting disconnections and failures of components like transmission lines and semiconductors without increasing circuit area by incorporating additional switch circuits.
Innovation Solution
A high-frequency circuit design with a transmission line on a dielectric substrate, incorporating resistors in parallel with electronic components and measurement terminals for direct current measurement to detect disconnections and short circuits, utilizing branch lines and capacitive coupling for impedance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch circuit and control circuit are disposed in parallel with a capacitor circuit for self-diagnosis, then abnormality detection capability is improved, but circuit area increases
Solution Approach 1:
The patent merges the self-diagnosis function with the existing capacitor circuit by utilizing the capacitor's inherent characteristics. The inspection circuit is integrated into the signal transmission path, combining abnormality detection with the signal processing function, thereby avoiding additional circuit area consumption.
Solution Approach 2:
The capacitor circuit serves multiple functions: it acts as a signal processing element during normal operation and as part of the inspection circuit for abnormality detection during self-diagnosis mode. This multi-functionality eliminates the need for separate dedicated inspection circuits.
2Measurement precision
If traditional high-frequency measurement devices are used for abnormality detection, then measurement precision is improved, but cost increases
Solution Approach 1:
The system performs self-diagnosis by utilizing its own internal circuits and components to detect abnormalities. The inspection circuit uses the capacitor and resistor elements already present in the signal transmission path to identify disconnections or short circuits, eliminating the need for external expensive measurement devices.
Solution Approach 2:
The patent introduces an intermediary inspection circuit that mediates between the signal transmission path and the abnormality detection function. This inspection circuit uses simple electrical measurements (voltage, current, resistance) through the existing capacitor and resistor to infer abnormalities, avoiding direct use of complex high-frequency measurement equipment.
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
Enables detection of disconnections and short circuits with a compact configuration, avoiding the need for expensive high-frequency measurement devices and maintaining pass gain integrity.
Implementation Method 1
measures at least one kind of a measurement value of a resistance value between the pair of measurement terminals, a voltage between the pair of measurement terminals, and a current flowing between the pair of measurement terminals
Implementation Method 2
a capacitor (32) that blocks a direct current and is inserted in series between the main line (14) and the main line (15)
Data Source
AI summary
A high-frequency circuit includes a capacitor connected to a main line of a transmission line, a resistor connected in parallel between two terminals of the capacitor, and bias terminals connected to the main line, disposed on both outsides of an inspection circuit that includes the resistor and the capacitor, and connected to a measurement device in a case of abnormality diagnosis, in which the measurement device applies a direct current voltage or a direct current to the inspection circuit through the bias terminals, measures at least one kind of measurement value of a resistance value, a voltage, and a current between the bias terminals, and detects whether or not at least one kind of abnormality including disconnection of the main line or short circuit of the capacitor occurs based on the measurement value.