Spiral Inductor Grounded Non-Continuous Trace
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Solution Overview
Problem
Conventional spiral inductor devices in semiconductor integrated circuits face reduced quality factor (Q value) due to conductor loss, parasitic capacitors, and substrate loss, which affects inductor performance.
Innovation Solution
The design incorporates a spiral conductive trace with multiple turns on an insulating layer, where the outermost and innermost turns are connected to ground, and a non-continuous conductive trace is added parallel to the spiral trace, connected to ground through connecting traces and a guard ring, to reduce substrate loss and parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a metal shielding layer is added between the spiral conductive trace and the semiconductor substrate to reduce substrate loss, then substrate loss is reduced, but an additional parasitic capacitor is formed between the metal shielding layer and the semiconductor substrate, increasing parasitic capacitance
Solution Approach 1:
An insulating layer is introduced as an intermediary between the spiral conductive trace and the semiconductor substrate. This insulating layer serves as a mediator that reduces the coupling between the trace and substrate, thereby reducing substrate loss and the associated parasitic capacitance, while avoiding the problem of adding a metal shielding layer that would create additional parasitic capacitance.
2Loss of energy
If the thickness and width of the spiral conductive trace are increased to reduce conductor loss, then conductor loss is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of increasing the thickness and width of the spiral conductive trace, the invention changes the parameter of electrical resistance by introducing an insulating layer between the trace and substrate. This reduces conductor loss through reduced parasitic coupling without requiring changes to the trace's physical dimensions, thereby avoiding increased device complexity and manufacturing difficulty.
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
This configuration enhances the Q value of the inductor device by reducing substrate loss and parasitic capacitance, thereby improving inductor performance.
Implementation Method 1
an insulating layer disposed on a substrate. A spiral conductive trace with multiple turns is disposed on the insulating layer
Implementation Method 2
one of the first and second ends is connected to ground. A non-continuous spiral conductive trace with a single turn is disposed on the insulating layer, parallel and adjacent to the turn that belongs to the spiral conductive trace and is extended from the end of the spiral conductive trace without being connected to ground, wherein the non-continuous spiral conductive trace is connected to the ground
Data Source
AI summary
A spiral inductor device is provided. The spiral inductor device comprises an insulating layer disposed on a substrate. A spiral conductive trace with multiple turns is disposed on the insulating layer, wherein the outermost turn and the innermost turn of the spiral conductive trace have a first end and a second end, respectively, and one of the first and second ends is connected to ground. A non-continuous spiral conductive trace with a single turn is disposed on the insulating layer, parallel and adjacent to the turn that belongs to the spiral conductive trace and is extended from the end of the spiral conductive trace without being connected to ground, wherein the non-continuous spiral conductive trace is connected to the ground.