Amplifier Circuit With MOS Capacitors for Dark Noise Compensation
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Solution Overview
Problem
Radiation detectors are adversely affected by dark noise, which complicates accurate signal detection, and existing compensation methods are inadequate.
Innovation Solution
An amplifier system with an adjustable current source and MOS capacitors is employed to compensate for dark noise by feeding a counteracting current, utilizing a processor to determine the compensation signal based on the detector's output and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an amplifier is used to detect radiation signals, then the detection capability is improved, but dark noise adversely affects measurement precision
Solution Approach 1:
The patent applies preliminary anti-action by introducing a compensation current source that generates a current equal in magnitude but opposite in direction to the dark noise current. This compensating current is injected into the amplifier input before the dark noise affects the measurement, effectively canceling out the harmful dark noise effect and improving measurement precision without sacrificing detection capability
Solution Approach 2:
The patent converts the harmful dark noise into a beneficial effect by measuring the dark noise current separately using a dedicated compensation current source, then using this measured dark noise information to generate a compensating signal. The harmful dark noise current is transformed into useful compensation data that improves the overall measurement accuracy
2Reliability
If a compensation current source is added to reduce dark noise, then dark noise compensation capability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by separating the dark noise compensation function from the main amplification function. A dedicated compensation current source is implemented as an independent module with its own current mirror circuitry, allowing it to operate separately from the main signal amplification path. This modular segmentation enables effective dark noise compensation while maintaining clear functional separation and manageable circuit complexity
Solution Approach 2:
The compensation current source is designed with multi-functionality, serving both as a dark noise measurement device and as a compensation signal generator. The same circuit structure performs multiple functions: measuring dark noise current, generating compensating current, and injecting it into the amplifier input, thereby reducing overall device complexity despite adding compensation capability
Data Source
Figure 1A~1C
Figure 1D~1G
Figure 2~3A
AI summary
An amplifier (309), comprising: an op-amp (391) configured to receive at an input thereof a first electric current; a first MOS capacitor (393) connected to the input and an output of the op-amp (391).