Ceramic ESD Protector for Coaxial Transmitting and Receiving Circuit
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Solution Overview
Problem
In CATV systems using the HFC system, semiconductor-based electro-static discharge protection circuits like TVSs cause harmonic distortion when used for high frequency signals, and cannot effectively protect semiconductor switches from leakage surge voltage without interfering with transmitted and received signals, especially when frequency bands overlap.
Innovation Solution
A coaxial cable-based transmitting and receiving circuit employing a ceramic-based electro-static discharge protector connected between the common port and ground potential, which does not cause harmonic distortion, allowing for the protection of semiconductor switches from leakage surge voltage without affecting signal transmission or reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor-based protection circuit (TVS) is used to protect the semiconductor switch from leakage surge voltage, then the protection effectiveness is improved, but harmonic distortion occurs due to non-linear load characteristics
Solution Approach 1:
The patent changes the material parameter of the protection circuit from semiconductor-based to ceramic-based. The ceramic material exhibits linear load characteristics unlike semiconductor-based TVS, thereby eliminating harmonic distortion while maintaining surge protection capability. This parameter change resolves the contradiction between protection effectiveness and harmonic distortion generation.
2Manufacturing precision
If a filter is added to eliminate harmonic distortion caused by TVS, then the signal quality is improved, but the received signal cannot be received due to frequency band overlap
Solution Approach 1:
The patent extracts and removes the filter component from the system by preventing the generation of harmonic distortion at its source. By using a ceramic-based protection circuit instead of semiconductor-based TVS, the harmful harmonic components are not generated in the first place, making the filter unnecessary. This resolves the contradiction between signal quality improvement and signal reception capability.
3Object-generated harmful factors
If a ceramic-based electro-static discharge protector is used instead of semiconductor-based TVS, then harmonic distortion is eliminated, but the protection circuit complexity increases
Solution Approach 1:
The patent merges the protection function with the existing circuit structure by integrating the ceramic-based ESD protector directly into the signal path without requiring additional components or complex circuitry. The ceramic protector is connected in parallel with the semiconductor switch, providing protection while maintaining circuit simplicity. This resolves the contradiction between harmonic distortion elimination and 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
The ceramic-based protector effectively safeguards semiconductor switches from leakage surge voltage without introducing harmonic distortion, eliminating the need for additional filters and ensuring uninterrupted signal transmission and reception across multiple frequency bands.
Implementation Method 1
a first electro-static discharge protector that is ceramic-based... The first electro-static discharge protector is connected between the common port and a ground potential
Data Source
AI summary
A transmitting and receiving circuit that transmits and receives signals using coaxial cables includes an input/output terminal that delivers and receives signals, a first port, a second port, a switch, and a ceramic-based electro-static discharge protector. The first port transfers a transmitted signal in a first transmission frequency band width and a received signal in a first reception frequency band width. The second port transfers a transmitted signal in a second transmission frequency band width and a received signal in a second reception frequency band width. The switch connects a common port to one of the first port and the second port. The common port is connected to the input/output terminal on one end of the common port and to the switch on the other end. The electro-static discharge protector is connected between the common port and the ground potential.