Non-common-ground Bandpass Filter Circuit ESD Protection
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Solution Overview
Problem
Conventional bandpass filter circuits with common-ground planes are susceptible to damage from electrostatic discharge (ESD) events, failing to provide adequate protection for coupled circuits.
Innovation Solution
A non-common-ground bandpass filter circuit design featuring a dielectric substrate and a conductor above a non-common-ground plane with separated and insulated ground regions, utilizing a defected ground structure such as slots or spaces to prevent ESD damage, providing both ESD and surge protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common-ground plane is used in the bandpass filter circuit, then the circuit structure is simple and easy to manufacture, but the circuit fails to provide ESD protection and coupled circuits are damaged by ESD events
Solution Approach 1:
The ground plane is segmented into multiple separate ground regions (first ground region, second ground region, etc.) that are electrically isolated from each other. This segmentation prevents ESD events from propagating across the entire ground plane, as each ground region is independently protected. The segmented ground structure maintains reliability by providing ESD protection while preserving the overall simplicity of the circuit design.
2Reliability
If the ground plane is separated into multiple insulated ground regions, then ESD protection is provided, but the circuit structure becomes more complex
Solution Approach 1:
Each ground region is configured with specific local characteristics - the first ground region corresponds to the first terminal and the second ground region corresponds to the second terminal of the conductor. This local quality approach provides surge protection at each specific location while maintaining overall system functionality. The defected ground structure with slots or spaces creates locally optimized protection zones without requiring complete restructuring of the entire circuit.
3Reliability
If a defected ground structure with slots or spaces is implemented, then ESD and surge protection are enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The slots or spaces in the defected ground structure act as intermediaries that electrically isolate adjacent ground regions while maintaining the structural integrity of the ground plane. These intermediary features provide the necessary ESD protection by blocking current flow between ground regions, yet they can be designed with tolerances that accommodate standard manufacturing variations. The intermediary slots serve as both protective barriers and manufacturing-friendly features that don't require ultra-precise fabrication.
Data Source
AI summary
A non-common-ground bandpass filter circuit with electrostatic discharge (ESD) protection is disclosed. The non-common-ground bandpass filter circuit with ESD protection includes a non-common-ground plane, a dielectric substrate and a conductor. The conductor is disposed above the non-common-ground plane. The dielectric substrate is disposed between the conductor and the non-common-ground plane. The non-common-ground plane at least has a first ground region and a second ground region separated and insulated from each other. The first ground region corresponds to a first terminal of the conductor and the second ground region corresponds to a second terminal of the conductor. When an ESD event occurs on one of the first ground region and the second ground region, the other of the first ground region and the second ground region will not be damaged by the ESD event. The non-common-ground bandpass filter circuit also provides surge protection.