Transient Voltage Absorber Circuit for Low High-Frequency Insertion Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transient voltage absorption elements cause high-frequency signal leakage to ground due to stray capacitance, degrading transmission characteristics in wide frequency bands, as existing solutions like diode-based circuits are ineffective in reducing insertion loss at high frequencies.
Innovation Solution
A transient voltage absorption circuit with a shunt-connected element featuring a first path for surge currents and a second path for signal frequencies, comprising a diode with depletion layer capacitance, inductors, and resistance components, where the first resistance component has a higher value than the second, reducing signal leakage and impedance effects across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transient voltage absorption element is inserted between a transmission line and ground, then transient voltage protection is provided, but high-frequency signal leaks to ground due to stray capacitance, degrading transmission characteristics
Solution Approach 1:
The transient voltage absorption element is divided into two separate current paths: a first path for surge currents containing a diode with depletion layer capacitance, and a second path for signal frequencies containing a capacitor. This segmentation allows each path to handle its designated frequency range independently, preventing signal leakage while maintaining protection capability.
Solution Approach 2:
Different impedance characteristics are assigned to different frequency ranges within the device. The first path provides high impedance to signal frequencies while the second path provides low impedance to signal frequencies, creating frequency-dependent local quality that directs signals appropriately and prevents high-frequency leakage to ground.
2Reliability
If a diode-based transient voltage absorption circuit is used, then surge protection is achieved, but insertion loss increases in high frequency bands due to stray capacitance effects
Solution Approach 1:
The circuit is segmented into two parallel paths with distinct functions: the first path handles surge currents through the diode, while the second path handles signal frequencies through the capacitor. This segmentation eliminates the interaction between diode capacitance and signal frequencies that causes insertion loss, as each path operates independently in its designated frequency range.
Solution Approach 2:
The capacitor in the second path acts as an intermediary that provides a low-impedance path for signal frequencies, mediating between the signal line and ground. This intermediary component prevents high-frequency signals from being affected by the stray capacitance of the diode path, thereby reducing insertion loss while maintaining surge protection capability.
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
Significantly reduces degradation of high-frequency transmission characteristics by minimizing signal leakage and maintaining low impedance in high frequency bands, improving frequency-dependent impedance characteristics and reducing insertion loss.
Implementation Method 1
a diode having a depletion layer capacitance
Implementation Method 2
The second path includes a series circuit including a capacitance
Data Source
AI summary
A transient voltage absorption element is provided that includes a first path and a second path, the first path is a current path in which a surge current flows, and the second path is a current path in a frequency band of a signal that propagates through the signal line. The first path includes a series circuit including a diode including a depletion layer capacitance, a first inductor, and a first resistance component, and the second path includes a series circuit including a capacitance, a second inductor, and a second resistance component. A resistance value of the first resistance component is higher than a resistance value of the second resistance component.