Charge Injection Circuit Using Equilibrium Potential for Photon Accuracy
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Solution Overview
Problem
Current counter-charge injection circuits in radiation detectors suffer from random noise affecting the accuracy of charge injection, particularly when dealing with small quantities of counter-charges, leading to fluctuations in the measurement of photons received, which is problematic in medical imaging where precision is crucial.
Innovation Solution
An electronic circuit that controls the quantity of charges injected at each comparator tilting by using an equilibrium potential to stabilize the injection process, allowing for precise calibration and reduction of parasitic charges, thereby improving the accuracy of photon measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional counter-charge injection circuits are used, then the circuit structure is simple, but the measurement precision deteriorates due to random noise affecting charge injection accuracy
Solution Approach 1:
The patent applies preliminary action by establishing an equilibrium potential before the actual measurement process. The circuit performs an initialization phase where it sets the integration node potential to a predetermined equilibrium value, storing this reference potential in a storage element. This preliminary setup ensures that subsequent charge injections occur from a known, stable reference state, eliminating the random noise effects that plague traditional circuits. The equilibrium potential serves as a baseline that compensates for technological variations and noise before measurements begin.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of an equilibrium potential establishment circuit. This intermediary component acts as a mediator between the noisy traditional circuit elements and the measurement process. By inserting this equilibrium potential reference system, the patent creates a buffer that isolates the measurement from random noise while maintaining circuit simplicity. The intermediary equilibrium potential reference enables accurate charge injection control without requiring complete redesign of the entire circuit architecture.
2Manufacturing precision
If small quantities of counter-charges are injected to improve measurement resolution, then the quantification step is reduced, but the impact of random noise and technological variations increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the injection potential based on the equilibrium potential reference. Instead of using fixed injection parameters, the circuit modifies the injection potential parameter adaptively. The injection potential is set relative to the equilibrium potential, allowing the system to maintain precise control over small charge quantities while compensating for noise and variations. This parameter adjustment mechanism enables the circuit to achieve both high quantification precision and reliability simultaneously.
Solution Approach 2:
The patent implements feedback by continuously monitoring the integration node potential and comparing it against the equilibrium potential reference. The circuit uses this feedback information to control the charge injection process, ensuring that injections occur only when needed and at the correct magnitude. The feedback mechanism allows the system to maintain stable measurements even when injecting small charge quantities, as any deviations from the expected behavior are corrected by adjusting subsequent injections based on the equilibrium reference.
3Measurement precision
If equilibrium potential establishment is implemented to control charge injection, then measurement accuracy is improved, but the initialization process time increases
Solution Approach 1:
The patent applies preliminary action by establishing the equilibrium potential once during initialization, before the actual measurement process begins. This preliminary setup creates a reference state that can be reused throughout the measurement process without requiring repeated initialization. The equilibrium potential is stored in a storage element, allowing rapid reference during measurements without time-consuming re-establishment. This approach minimizes initialization time while maintaining measurement precision throughout the operational phase.
Data Source
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Figure 2C~3
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AI summary
The invention relates to an electronic read circuit for a radiation detector comprising: • an element (11) sensitive to the radiation, • an injection circuit, able to inject a charge at one terminal of the sensitive element (11), the injection circuit (14) extending between at least one input terminal and one output terminal, the output terminal being able to be connected to said sensitive element (11), the injection circuit (14) being able to produce a charge under the effect of a trigger pulse. The injection circuit is able to inject a first charge when an input terminal is connected to a first input potential and a second charge when an input terminal is connected to a second input potential (Vinj2, Phiinj)). The circuit comprises means for storing a difference between an output potential of the injection circuit (14), called equilibrium potential, and a reference potential, such that the second charge depends on the second input potential and on said equilibrium potential.