3D-IC Clock Delay Circuit for Synchronized Chip Stacking
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Solution Overview
Problem
In three-dimensional integrated circuit (3D-IC) and chip-on-wafer-on-substrate (CoWoS) systems, improper clock signal synchronization between stacked semiconductor chips leads to data communication errors.
Innovation Solution
Employing a delay circuit that introduces a predetermined propagation delay to the clock signal to synchronize the clock signals across semiconductor chips, ensuring they arrive simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signals are transmitted between stacked semiconductor chips, then data communication can be enabled, but clock signal synchronization errors occur leading to data communication failures
Solution Approach 1:
A delay circuit is introduced as an intermediary component between the clock signal source and the receiving circuits. This delay circuit adjusts the timing of clock signals to compensate for propagation delays through the interposer substrate, ensuring that clock signals arrive at all receiving circuits simultaneously. The delay circuit acts as a mediator that corrects timing mismatches without requiring changes to the fundamental system architecture.
Solution Approach 2:
The delay circuit is configured to pre-adjust clock signal timing before the signals are distributed to receiving circuits. By calculating the expected propagation delays through the interposer substrate in advance, the system can pre-compensate for timing differences, ensuring synchronized arrival of clock signals at all destinations without requiring real-time adjustment mechanisms.
2Area of stationary object
If multiple semiconductor chips are stacked to reduce surface area, then system integration density is improved, but clock signal distribution complexity increases
Solution Approach 1:
The delay circuit is designed with adjustable delay elements that can be configured to compensate for varying propagation delays to different receiving circuits. This universal delay circuit can serve multiple receiving circuits with different timing requirements, eliminating the need for separate delay adjustment mechanisms for each circuit and reducing overall system complexity.
Data Source
AI summary
A system includes a plurality of semiconductor chips that are stacked on top of each other and that include first and second semiconductor chips. The first semiconductor chip includes a clock signal generating circuit, a transmitting circuit, and a receiving circuit. The clock signal generating circuit generates a clock signal and a delayed version of the clock signal. The transmitting circuit transmits a first data signal in response to the clock signal. The receiving circuit receives a second data signal in response to the delayed version of the clock signal. For example, the receiving circuit receives the delayed version of the clock signal at substantially the same time that the transmitting circuit receives the clock signal.