Compound Semiconductor Switching Circuit High Resistance Element Signal Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In compound semiconductor switching circuit devices, high frequency signals leak through nitride films to resistors, increasing insertion loss between input and output terminals due to the extension of resistors to connect control terminal pads to gate electrodes, which is not effectively mitigated by existing designs.
Innovation Solution
Incorporating high resistance elements with a sheet resistance higher than the connecting paths at intersections between connection wiring and control terminal pads, these elements are strategically placed near control terminal pads to attenuate high frequency signal leakage, thereby reducing insertion loss without increasing chip size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resistors are extended to connect control terminal pads to gate electrodes, then reverse control type logic can be implemented, but high frequency signal leakage increases and insertion loss worsens
Solution Approach 1:
A ground terminal pad is introduced as an intermediary element between the control terminal pads and the FET gate electrodes. The connecting paths are routed through this ground terminal pad, which serves as a reference potential point. This intermediary structure prevents high frequency signals from leaking through the nitride film to the control terminal pads, thereby reducing insertion loss while still enabling reverse control type logic functionality.
Solution Approach 2:
The connecting path between control terminal pads and gate electrodes is segmented into two separate paths: one path from the control terminal pad to the ground terminal pad, and another path from the ground terminal pad to the gate electrode. This segmentation isolates the control terminal pad from direct signal leakage paths, as the ground terminal pad acts as a potential barrier that prevents high frequency signal coupling to the control terminals.
2Adaptability or versatility
If resistors are extended to connect control terminal pads to gate electrodes, then reverse control type logic can be implemented, but chip area increases
Solution Approach 1:
The ground terminal pad is merged with the existing pad structure, serving dual functions as both a control reference terminal and a signal ground reference. The connecting paths for control signals and ground references are merged into a shared physical structure, eliminating the need for separate ground terminal structures and reducing overall chip area while still enabling reverse control type logic.
3Adaptability or versatility
If resistors are extended to connect control terminal pads to gate electrodes, then reverse control type logic can be implemented, but high frequency signal leakage occurs through nitride films
Solution Approach 1:
The ground terminal pad serves as an intermediary that blocks the leakage path. By routing connecting paths through the ground terminal pad rather than directly connecting control terminal pads to gate electrodes, the high frequency signal leakage through nitride films is prevented, as the ground reference potential at the intermediary pad breaks the leakage coupling path.
Solution Approach 2:
The direct connection path between control terminal pads and gate electrodes is segmented by introducing the ground terminal pad as an intermediate node. This segmentation creates separate potential zones that prevent high frequency signal leakage, as the ground reference at the segmented node disrupts the capacitive coupling through the nitride film that would otherwise allow signal leakage.
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 high resistance elements effectively attenuate high frequency signal leakage, preventing it from reaching control terminals and thus reducing insertion loss between input and output terminals, while allowing for the implementation of reverse control type logic without expanding the chip area.
Implementation Method 1
a high resistance element 320 having a sheet resistance higher than a sheet resistance of a connecting path 311 at an intersection 301 between connection wiring 302 and the first connecting path 310
Data Source
AI summary
High resistance elements of 5 KΩ or more are connected near first and second control terminals between the first and second control terminals and respective crossing portion of first and second connectings. Even when a high frequency analog signal transmitted in a pad wire leaks to the first and second connectings, the high frequency analog signal is attenuated by the high resistance elements. Accordingly, the high frequency analog signal is not substantially transmitted to control terminal pads. It is therefore possible to suppress an increase in insertion loss.