Integrated LC Oscillator Layout for Stable SoC Timing
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Solution Overview
Problem
Conventional integrated circuits require additional dedicated process steps to form system-on-chip configurations, increasing manufacturing costs and delays, and existing inductor-capacitor oscillators are not accurate or reliable for timing-sensitive applications.
Innovation Solution
Integrated inductor-capacitor oscillators are formed by creating inductors partially during the back-end-of-line structure on a semiconductor substrate and capacitors embedded within or supported by the substrate, using techniques like Damascene processes and dielectric materials to reduce processing acts and enhance accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional dedicated process steps are used to form system-on-chip configurations, then manufacturing precision and component quality improve, but manufacturing cost and production time increase
Solution Approach 1:
The patent combines the formation of inductors and capacitors with the existing back-end-of-line (BEOL) interconnect structure formation processes. By integrating passive component fabrication into the standard interconnect manufacturing sequence, the patent eliminates dedicated separate process steps while maintaining component quality, thus resolving the contradiction between manufacturing precision and productivity.
Solution Approach 2:
The patent creates a multi-functional BEOL structure that simultaneously serves as interconnect wiring and as inductor and capacitor components. The interconnect layers are designed to perform dual roles: signal transmission and passive component functionality, thereby reducing the number of required process steps while maintaining component quality.
2Reliability
If conventional separate formation methods are used for inductors and capacitors, then component reliability improves, but device complexity and processing steps increase
Solution Approach 1:
The patent merges the fabrication of inductors, capacitors, and interconnect structures into a single integrated process sequence. By forming all these components simultaneously during the BEOL process rather than separately, the patent reduces device complexity and processing steps while maintaining component reliability through consistent manufacturing conditions and materials.
3Reliability
If inductors and capacitors are formed as separate components, then component performance improves, but integration density and system-on-chip feasibility decrease
Solution Approach 1:
The patent merges inductors, capacitors, and interconnect structures into a single integrated BEOL formation process, enabling high integration density while maintaining component performance. The simultaneous formation approach allows compact layout and efficient space utilization on the chip substrate.
Solution Approach 2:
The patent utilizes three-dimensional stacking and vertical integration in the BEOL structure to achieve high integration density. By arranging inductors, capacitors, and interconnects in multiple layers and dimensions rather than planar layouts, the patent increases integration density while preserving component performance characteristics.
Data Source
AI summary
A system-on-chip may include an inductor-capacitor oscillator monolithically integrated into the system-on-chip The inductor-capacitor oscillator may be configured to improve frequency stability and reduce noise when compared to a resistor-capacitor oscillator. Methods of making integrated oscillators may involve forming an inductor at least partially while forming a BEOL structure on a substrate. A capacitor supported on and/or embedded within the semiconductor material of the substrate may be formed before or while forming the BEOL structure. The inductor may be connected to the capacitor in parallel at least partially utilizing the BEOL structure to form an integrated inductor-capacitor oscillator.