Radiation Detector Module With Through-Substrate Vias
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Solution Overview
Problem
Current radiation detectors, particularly pixelated semiconductor detectors like cadmium zinc telluride (CZT), face challenges in efficiently converting event detection signals into digital signals due to high input node capacitance and power consumption, which affects their performance in medical and non-medical imaging applications.
Innovation Solution
A radiation detector module is designed with a continuous array of active pixel detectors mounted over an application-specific integrated circuit (ASIC) via bonding material, where the ASIC includes through-substrate vias (TSVs) to directly couple the radiation sensors to a carrier board, reducing input node capacitance and enhancing signal conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional radiation detectors are used, then radiation detection is achieved, but input node capacitance and power consumption are high
Solution Approach 1:
The detector is divided into discrete pixel regions, with each pixel having its own readout circuitry. This segmentation allows for localized signal processing and reduces the total capacitance at any single node, thereby lowering power consumption while maintaining detection efficiency across the entire detector array.
Solution Approach 2:
The patent introduces through-substrate vias that extend vertically through the detector substrate, creating a three-dimensional signal routing architecture. This vertical dimension allows signals to be routed directly from the pixel region through the substrate to the readout circuitry, reducing the horizontal signal path length and associated capacitance, thus improving both power efficiency and detection reliability.
2Productivity
If conventional signal conversion methods are used, then event detection signals are converted, but conversion efficiency is low due to high input node capacitance
Solution Approach 1:
Through-substrate vias serve as intermediary conductive pathways that directly connect the pixel region to the readout circuitry. These vias act as low-capacitance signal transmission channels, enabling efficient signal conversion from event detection signals to digital signals while minimizing energy loss and reducing the input node capacitance burden.
3Reliability
If through-substrate vias are implemented, then input node capacitance is reduced, but device complexity increases
Solution Approach 1:
The through-substrate vias are integrated directly into the ASIC substrate, merging the signal routing function with the existing detector structure. This consolidation eliminates the need for separate interconnection layers or additional packaging complexity, reducing overall device complexity while achieving the capacitance reduction benefits of vertical signal routing.
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
This configuration significantly reduces power consumption and equivalent noise charge, improving the detection efficiency and accuracy of radiation events, enabling better imaging capabilities in medical and non-medical applications.
Implementation Method 1
the application specific integrated circuit includes a plurality of through-substrate vias extending through the application specific integrated circuit and electrically coupling the application specific integrated circuit to the carrier board
Implementation Method 2
the at least one radiation sensor mounted over a front surface of the application specific integrated circuit via a plurality of bonding material portions
Data Source
AI summary
A radiation detector unit includes at least one radiation sensor having pixel detectors that generate event detection signals in response to photon interaction events, an application specific integrated circuit (ASIC) including circuit components on a substrate, the at least one radiation sensor mounted over the application specific integrated circuit via a plurality of bonding material portions such that event detection signals generated in each of the pixel detectors of the at least one radiation sensor are received at a respective pixel region of the ASIC, and the circuit components of the ASIC convert the event detection signals received at each of the pixel regions of the ASIC to digital detection signals, and a carrier board underlying the ASIC, where the ASIC includes a plurality of through-substrate vias (TSVs) electrically coupling the ASIC to the carrier board, each of the TSVs underlying an active pixel detector of the at least one radiation sensor.