Decoupling Capacitor With Segmented Fingers For Leakage Reduction
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Solution Overview
Problem
In semiconductor design, smaller geometry technologies pose challenges for decoupling capacitors in integrated circuits due to high leakage current and electrostatic discharge (ESD) concerns, making traditional MOS capacitors inadequate for noise performance in smaller geometries.
Innovation Solution
The integration of small CMOS capacitors with specific transistor configurations, where the third nodes of each transistor have a width and length of at least ten percent of the width, connected in a manner that reduces leakage current and ESD susceptibility, allowing for effective decoupling in smaller geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional MOS capacitors are used in smaller geometry technologies, then device scaling is achieved, but leakage current increases and ESD performance deteriorates
Solution Approach 1:
The capacitor is segmented into multiple fingers (typically four fingers per capacitor) arranged in a compact configuration. Each finger consists of interleaved conductive plates separated by dielectric material, allowing the capacitor to achieve sufficient capacitance in a smaller footprint while maintaining reliable performance through distributed charge storage across multiple segments
Solution Approach 2:
The capacitor fingers are nested within a single standard cell boundary, with conductive plates interleaved in a compact arrangement that maximizes capacitance density. The structure fits within the white space of the core by nesting multiple finger pairs in a space-efficient configuration that maintains proper spacing for ESD protection
2Reliability
If decoupling capacitors are placed in white space to improve noise performance, then noise performance improves, but available space for capacitor placement is limited
Solution Approach 1:
The capacitor structure utilizes vertical stacking of conductive plates separated by dielectric layers, creating capacitance in the vertical dimension rather than requiring extensive horizontal space. Multiple finger pairs are stacked and interleaved to achieve sufficient capacitance within the limited lateral dimensions of the white space cell
Solution Approach 2:
The capacitor is designed with different finger configurations and dielectric material selections optimized for the specific white space location and noise requirements. The compact finger structure allows placement in constrained spaces while maintaining the decoupling function by concentrating capacitance in a localized region
Data Source
AI summary
An integrated circuit includes a capacitor having first, second and third nodes. The first and second nodes of the first transistor are connected together and the first and second nodes of the second transistor are connected together. The third node of the first transistor is connected to the third node of the second transistor. Each of the third nodes is constructed so that each node comprises a width and a length that is at least ten percent of the width.