Multilayer Feedthrough Capacitor Array Layout for Crosstalk Suppression
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Solution Overview
Problem
Multilayer feedthrough capacitor arrays experience crosstalk due to common impedance coupling between capacitors, where a ground internal electrode acts as a common impedance for multiple capacitors, causing noise and interference.
Innovation Solution
The design separates the first and second ground internal electrodes from each other and their respective signal internal electrodes by at least one insulator layer, preventing common impedance coupling and reducing the likelihood of crosstalk by electrically connecting the ground internal electrodes through terminal electrodes with lower impedance, thereby isolating capacitors and minimizing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a ground internal electrode is common to two different capacitors, then the device complexity is reduced, but crosstalk occurs due to common impedance coupling
Solution Approach 1:
The ground internal electrodes are segmented into separate electrodes for each capacitor unit. The first capacitor has a first ground internal electrode, and the second capacitor has a second ground internal electrode, preventing common impedance coupling between the two capacitors while maintaining structural organization through systematic arrangement
Solution Approach 2:
An insulator layer is introduced as an intermediary between the first ground internal electrode and the second ground internal electrode. This insulator layer physically separates the two ground electrodes, eliminating the common impedance path that causes crosstalk while allowing both electrodes to function independently
2Object-affected harmful factors
If signal internal electrodes and ground internal electrodes are disposed with at least one insulator layer in between, then crosstalk is suppressed, but the device height increases
Solution Approach 1:
The design transitions from vertical stacking to lateral arrangement by disposing signal and ground internal electrodes side-by-side within the same layer plane rather than stacking them vertically. This dimensional change allows insulator layers to separate electrodes horizontally, suppressing crosstalk without increasing device height through vertical stacking
3Reliability
If ground internal electrodes are electrically connected through terminal electrodes, then the impedance is reduced, but the likelihood of common impedance coupling increases
Solution Approach 1:
The ground internal electrodes are segmented into separate electrodes that remain electrically independent throughout the capacitor structure. Each ground electrode is isolated by insulator layers and connects only to its own external terminal, preventing common impedance coupling even though this requires separate terminal connections for each capacitor
Data Source
AI summary
A multilayer feedthrough capacitor array is provided with a capacitor element, and first to sixth terminal electrodes. The capacitor element has a plurality of laminated insulator layers, a first signal internal electrode and a first ground internal electrode disposed so as to face each other with the insulator layer in between, and a second signal internal electrode and a second ground internal electrode disposed so as to face each other with the insulator layer in between. The first signal internal electrode includes a first signal lead portion electrically and physically connected to the first terminal electrode, and a second signal lead portion electrically and physically connected to the second terminal electrode. The first ground internal electrode includes a first ground lead portion electrically and physically connected to the fifth terminal electrode, and a second ground lead portion electrically and physically connected to the sixth terminal electrode. The second signal internal electrode includes a third signal lead portion electrically and physically connected to the third terminal electrode, and a fourth signal lead portion electrically and physically connected to the fourth terminal electrode. The second ground internal electrode includes a third ground lead portion electrically and physically connected to the fifth terminal electrode, and a fourth ground lead portion electrically and physically connected to the sixth terminal electrode. The first signal internal electrode and the second ground internal electrode are disposed so as not to face each other with the insulator layer in between, and the second signal internal electrode and the first ground internal electrode are disposed so as not to face each other with the insulator layer in between.