Multiplexing Signal Processing Device Leakage Current Reduction
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Solution Overview
Problem
Current multiplexing signal processing devices in radiation imaging equipment suffer from reduced linearity and signal-to-noise ratio due to leakage currents, especially as the number of channels increases, which affects the accuracy and energy resolution of images.
Innovation Solution
A multiplexing signal processing device is designed with a matrix arrangement of signal converters, each comprising a first diode, a second diode, and a ground resistor, connected to row and column unit output terminals, which reduces leakage current and enhances linearity and signal-to-noise ratio by providing a ground path for excess current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resistor-based multiplexing circuits (DPC) are used to reduce the number of channels, then channel reduction ratio is improved, but linearity and signal-to-noise ratio deteriorate due to leakage current
Solution Approach 1:
The patent changes the electrical parameters of the circuit by replacing resistors with diodes, exploiting the diode's non-linear current-voltage characteristics to suppress leakage current while maintaining channel reduction capability. This parameter change transforms the circuit's electrical behavior to resolve the contradiction between channel reduction and signal quality.
Solution Approach 2:
The patent converts the diode's inherent non-linearity, which could be considered a harmful deviation from ideal linear circuit behavior, into a beneficial feature that suppresses leakage current. By utilizing the diode's threshold voltage characteristic, the circuit transforms potential signal distortion into a mechanism that prevents harmful leakage current, thereby improving linearity and signal-to-noise ratio.
2Measurement precision
If diode-based multiplexing circuits are used to reduce leakage current, then linearity is improved, but energy resolution deteriorates due to remaining leakage current
Solution Approach 1:
The patent segments the current path by introducing separate row and column selection lines that independently control different groups of diodes. This segmentation allows precise control of current flow through the detector array, enabling the circuit to maintain low leakage current while preserving energy resolution by preventing current from taking unintended paths.
Solution Approach 2:
The patent introduces intermediate selection lines and control circuits that act as mediators between the input signals and the detector elements. These intermediary components enable precise control of current distribution, allowing the circuit to achieve both low leakage current and high energy resolution by directing current flow through intended paths only.
3Measurement precision
If the number of channels is increased to improve image accuracy, then image quality is improved, but leakage current increases causing reduced linearity and signal-to-noise ratio
Solution Approach 1:
The patent changes the electrical parameters of each channel by incorporating diodes with specific threshold voltage characteristics. This parameter change enables each channel to suppress leakage current independently, allowing the system to increase the number of channels for improved image accuracy without suffering from cumulative leakage current effects that would degrade linearity and signal-to-noise ratio.
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 effectively minimizes leakage current, improving energy resolution, time resolution, and signal-to-noise ratio, while maintaining linear output signal characteristics, as demonstrated by experimental results showing improved performance compared to traditional resistor-based and diode-based circuits.
Implementation Method 1
the signal converters each include a first diode having an input terminal connected to an input signal node for receiving one of the plurality of input signals, a second diode having an input terminal connected to the input signal node
Implementation Method 2
a ground resistor coupled to the input signal node
Data Source
AI summary
Provided is a multiplexing signal processing device based on a passive element including a plurality of signal converters that respectively process a plurality of input signals and are arranged in a matrix consisting of N rows and M columns and include N signal converter blocks respectively connected to N row unit output terminals; and M signal converter blocks respectively connected to M column unit output terminals. The signal converters each include a first diode having an input terminal connected to an input signal node, a second diode having an input terminal connected to the input signal node, and a ground resistor coupled to the input signal node.