Edgeless 3D Integrated Camera for XPCS Data Throughput
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Solution Overview
Problem
Traditional x-ray area detectors are inefficient for X-ray Photon Correlation Spectroscopy (XPCS) due to anomalously weak signals and high data throughput from processing empty pixels, as they read out every pixel on every exposure, which is not well-suited for the low occupancy rates of XPCS.
Innovation Solution
A 3D integrated camera system with a large area sensor bonded to an array of 3D integrated ASICs, connected to a PCB or ceramic board and FPGAs, featuring a Vertically Integrated Photon Imaging Chip (VIPIC) for sparsified readout, high-time resolution, and real-time auto-correlation function calculation, eliminating the need for traditional wire-bonds and reducing data processing of empty pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional x-ray area detectors read out every pixel on every exposure, then complete image data is captured, but data throughput efficiency deteriorates due to processing empty pixels in low occupancy rate applications
Solution Approach 1:
The patent extracts only the relevant data (hit pixels) from the complete pixel array, eliminating the need to process empty pixels. The sparsified readout mode reads out only pixels that have detected photons, separating useful information from unnecessary data processing.
Solution Approach 2:
Instead of reading out all pixels (excessive action), the system performs partial readout by selectively reading only the hit pixels. This partial action is sufficient for XPCS applications where only a small fraction of pixels are occupied, dramatically improving efficiency.
2Productivity
If 3D integrated ASICs are used with large area sensors, then data processing efficiency improves through sparsified readout, but device complexity increases due to multi-tier integration
Solution Approach 1:
The patent transitions from planar (2D) integration to three-dimensional (3D) integration by stacking multiple ASIC tiers vertically. This dimensional change allows complex functionality to be achieved through vertical stacking rather than horizontal expansion, improving data processing efficiency while managing complexity through layered architecture.
Solution Approach 2:
The multi-tier ASIC structure implements nesting by placing functional blocks within tiers and stacking tiers vertically. Each tier contains nested functional units (analog pixels, digital processing blocks) that are hierarchically organized, allowing complex data processing within a compact integrated structure.
3Manufacturing precision
If wire-bonding is replaced with 3D bonding, then manufacturing precision improves through direct integration, but manufacturing difficulty increases due to advanced bonding requirements
Solution Approach 1:
The patent replaces traditional wire-bonding (mechanical connection) with direct 3D bonding of ASIC tiers to the sensor. This substitution eliminates the need for external wire connections and achieves more precise electrical and mechanical integration through direct bonding interfaces between stacked components.
Data Source
AI summary
A detecting apparatus includes a multi-tier 3D integrated ASIC comprising one or more analog tiers and one or more digital tiers, and a sensor bonded to the multi-tier 3D integrated ASIC. The detecting apparatus includes an electrical substrate and a group of FPGAs or custom data management ASICs. The detecting apparatus also includes a thermal management system, a power distribution system and one or more connectors to transfer data to a data acquisition system configured for radiation spectroscopy or imaging with zero suppressed or full frame readout.