Cell-Type Power Decoupling Capacitor for Chip Area Reduction
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Solution Overview
Problem
Semiconductor devices face challenges in stabilizing supply voltage and occupying minimal chip area while being insensitive to power noise, particularly in low-voltage and high-precision fabrication processes.
Innovation Solution
A cell-type power decoupling capacitor is formed on a semiconductor substrate using a stack cell capacitor process, comprising a first conductive layer connected to high supply voltage, a second conductive layer connected to low supply voltage, and a dielectric layer in between, with the second conductive layer having a U-shape structure, and is placed on active layers, resistor areas, or between CMOS transistor arrays to stabilize supply voltage and occupy a small area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power decoupling capacitor is used, then supply voltage stabilization is achieved, but the chip area occupied is large
Solution Approach 1:
The power decoupling capacitor is transformed from a planar structure to a three-dimensional stacked structure with multiple conductive layers and dielectric layers arranged vertically. This dimensional change allows the capacitor to achieve larger capacitance value while occupying minimal chip area, directly resolving the contradiction between voltage stabilization capability and area occupation.
Solution Approach 2:
The capacitor structure is nested within the existing semiconductor device architecture by integrating it between CMOS transistor arrays and over active layers or resistor areas. The first conductive layer connects to high supply voltage nodes while the second conductive layer connects to low supply voltage nodes, nesting the decoupling function within the existing power distribution network without requiring separate dedicated space.
2Reliability
If a conventional power decoupling capacitor is used, then supply voltage stabilization is achieved, but sensitivity to power noise increases
Solution Approach 1:
The dielectric layer acts as an intermediary between the first conductive layer connected to high supply voltage and the second conductive layer connected to low supply voltage. This intermediate dielectric structure isolates the capacitor from direct noise coupling to sensitive circuit nodes while still providing effective decoupling, thereby reducing power noise sensitivity while maintaining voltage stabilization.
3Area of stationary object
If chip area is minimized, then chip efficiency is improved, but supply voltage stabilization capability is reduced
Solution Approach 1:
By stacking multiple conductive layers and dielectric layers vertically, the capacitor achieves large capacitance in a small footprint. The multi-layer configuration provides sufficient charge storage capacity for voltage stabilization while occupying minimal horizontal chip area, directly resolving this contradiction.
Solution Approach 2:
The power decoupling capacitor structure is merged with the existing semiconductor device architecture by placing it between CMOS transistor arrays and utilizing existing active layers or resistor areas. This integration allows the capacitor to provide voltage stabilization functionality without requiring separate dedicated space, effectively combining decoupling function with the existing device structure.
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 solution provides a semiconductor device that is insensitive to power noise and occupies a small area on the chip, effectively stabilizing supply voltage for internal circuits, improving noise characteristics and chip efficiency.
Implementation Method 1
a dielectric layer disposed between the first conductive layer and the second conductive layer
Data Source
AI summary
A semiconductor device includes an internal circuit and a cell-type power decoupling capacitor. The cell-type power decoupling capacitor is formed on a semiconductor substrate using a stack cell capacitor process. The cell-type power decoupling capacitor stabilizes a supply voltage to provide the stabilized supply voltage to the internal circuit. Accordingly, the semiconductor device including the cell-type power decoupling capacitor may be insensitive to power noise and may occupy a small area on a chip.