Radiation Detector Readout Circuit for High-Flux Charge Sharing
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Solution Overview
Problem
Existing radiation detectors face reduced maximum output count rates due to pulse pile-up for increased input count rates in charge sharing correction implementations.
Innovation Solution
A readout circuit for a radiation detector that simultaneously acquires single pixel counts and charge sharing correction counts, utilizing both charge sharing correction circuits and non-sharing circuits to improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If charge sharing correction circuits are used to improve energy resolution, then measurement precision is improved, but maximum output count rate decreases due to pulse pile-up
Solution Approach 1:
The readout circuit is divided into two independent parallel paths: a charge sharing correction circuit path and a non-sharing circuit path. Each path processes signals independently - the charge sharing correction path sums signals from multiple pixels to improve energy resolution for low count rates, while the non-sharing path directly processes single pixel signals for high count rate operation without pulse pile-up. This segmentation allows the system to maintain high energy resolution when needed while avoiding count rate limitations.
Solution Approach 2:
The system dynamically selects between charge sharing correction mode and non-sharing mode based on the input count rate conditions. When the count rate is low, the charge sharing correction circuits are activated to maximize energy resolution. When the count rate increases and pulse pile-up becomes problematic, the system switches to or relies on the non-sharing circuit path that can handle higher rates without degradation. This dynamic adaptation resolves the contradiction between precision and productivity.
2Reliability
If charge sharing correction is implemented to reduce double counting of photons, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the charge sharing correction functionality with the existing pixel readout architecture by integrating correction circuits that operate in parallel with the primary readout path. The correction circuits combine signals from neighboring pixels using summation nodes, and the corrected signals are merged back into the overall count. This merging approach improves reliability by reducing double-counting errors while adding minimal structural complexity compared to completely separate systems.
Solution Approach 2:
The readout circuit is designed with multi-functionality, where the same physical infrastructure supports both charge sharing correction operations and standard single-pixel readout operations. The circuit can operate in different modes (charge sharing correction mode or non-sharing mode) depending on conditions, making it a universal solution that handles various counting scenarios without requiring entirely separate dedicated circuits for each function.
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
The solution enables improved performance by allowing simultaneous acquisition of sharing and non-sharing counted data, enhancing radiation detector capabilities for high flux conditions and maintaining high energy resolution across varying input count rates.
Implementation Method 1
The radiation is converted to an electrical signal
Data Source
AI summary
A readout circuit for a radiation detector comprising a plurality of pixels, the readout circuit being configured to handle input signals from a primary pixel with respect to the readout circuit among the plurality of pixels and comprising a charge sharing correction circuit, the charge sharing correction circuit being configured to handle a charge sharing electrical signal representative of a sum of radiation energies from a set of pixels among the plurality of pixels, the set of pixels comprising a secondary pixel with respect to the readout circuit; and a non-sharing circuit configured to handle a primary electrical signal associated with the primary pixel simultaneously with the handling of the charge sharing electrical signal by the charge sharing correction circuit, the primary electrical signal being representative of radiation energy from the primary pixel.