Detection Signal Processor Bias Current Control for Heat and Noise
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Solution Overview
Problem
Existing detection signal processors in radiography systems face challenges in high-speed operation due to increased heat generation, which can damage radiation detectors, and in low-speed operation, they suffer from noise deterioration affecting signal quality.
Innovation Solution
A detection signal processor with a bias current control system that dynamically adjusts bias currents to circuits performing first and second signal processing, allowing for high-speed output while minimizing heat generation or reducing noise, by varying bias currents based on operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If relatively large bias currents are supplied to all circuits of the signal processing unit for high-speed operation, then high-speed output is achieved, but heat generation increases causing radiation detector damage
Solution Approach 1:
The signal processing unit is divided into multiple circuits (integrator circuit, first amplifier circuit, parallel-to-serial converter, second amplifier circuit, A/D converter), and bias currents are supplied independently to each circuit. This segmentation allows selective control of bias currents to different circuits based on their specific requirements, enabling high-speed operation in certain circuits while limiting heat generation in others.
Solution Approach 2:
Different bias current amounts are supplied to different circuits within the signal processing unit according to their specific operational requirements. For example, circuits requiring high-speed operation receive larger bias currents, while circuits where heat generation is a concern receive smaller bias currents. This local differentiation resolves the contradiction between speed and heat generation.
2Object-affected harmful factors
If relatively small bias currents are supplied to all circuits for low-speed operation, then heat generation is reduced, but noise components increase deteriorating signal quality
Solution Approach 1:
The signal processing circuits are segmented with independent bias current control, allowing each circuit to operate at optimal bias levels. This enables maintaining low overall heat generation while preserving signal quality in critical circuits through selective bias current allocation.
Solution Approach 2:
Circuits where signal quality is critical (such as the integrator circuit and amplifier circuits) are supplied with appropriate bias currents to minimize noise, while other circuits are supplied with reduced bias currents to limit heat generation. This local quality differentiation resolves the contradiction between heat reduction and signal quality maintenance.
3Speed
If relatively large bias currents are supplied to circuits for high-speed operation, then operation speed is improved, but temperature increases causing characteristic variations
Solution Approach 1:
The signal processing unit is segmented into multiple independently controllable circuits, allowing bias currents to be adjusted for each circuit. This enables high-speed operation in circuits where speed is critical while maintaining lower temperatures in temperature-sensitive circuits.
Solution Approach 2:
Different temperature conditions are created for different circuits based on their thermal sensitivity. Temperature-sensitive circuits receive smaller bias currents to maintain stable operating temperatures, while less temperature-sensitive circuits receive larger bias currents for high-speed operation, resolving the contradiction between speed and temperature stability.
Data Source
AI summary
A detection signal processor that includes a signal processing unit, bias current supply components, and a bias current control component is provided. The signal processing unit applies a first signal processing in parallel to plural detection signals input in parallel, converts the plural detection signals to serial detection signals by applying a parallel-to-serial conversion processing to the plural detection signals, and applies a second signal processing to the converted serial detection signals in turn. The bias current control component switches amount of the bias currents supplied to the each circuit configuring the signal processing unit by the bias current supply components, the bias currents including first bias currents supplied to the first circuits carrying out the first signal processing and second bias currents supplied to the second circuits carrying out the parallel-to-serial conversion processing and the second signal processing in turn.