SiC Charge-Sensitive Amplifier With Reset Pulses for Radiation Detectors

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Solution Overview

Problem

Existing silicon-based junction field-effect transistors in charge-sensitive amplifying circuits fail in high temperature and high irradiation environments, leading to failures in radiation detector systems.

Innovation Solution

A reset-type charge-sensitive amplifying circuit utilizing a silicon carbide-based junction field-effect transistor and diode, along with a reset pulse signal generation module, to amplify and reset data signals, ensuring normal operation in extreme environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If silicon-based junction field-effect transistors are used in charge-sensitive amplifying circuits, then the circuit can operate under normal conditions, but the circuit fails in high temperature and high irradiation environments

Engineering Contradiction:

Improveoperational reliabilityVSAvoidenvironmental adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the material parameter of the junction field-effect transistor from silicon-based to silicon carbide-based. This material parameter change enables the transistor to withstand high temperature and high irradiation environments while maintaining amplification functionality, thus resolving the contradiction between operational reliability and environmental adaptability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs silicon carbide composite material structure in the junction field-effect transistor. Silicon carbide combines the advantages of wide bandgap, high thermal conductivity, and high radiation resistance, creating a composite material solution that maintains circuit reliability under extreme environmental conditions

Inventive Principle:

Principle #40Composite materials

2Device complexity

If conventional amplifying circuits are used without reset mechanism, then the circuit structure is simpler, but noise accumulates and signal-to-noise ratio deteriorates

Engineering Contradiction:

Improvecircuit structure complexityVSAvoidsignal-to-noise ratio

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements a reset mechanism that performs preliminary action by clearing accumulated charge and noise from the capacitor before new signal amplification. The reset pulse signal generation module periodically resets the amplifying circuit, preventing noise accumulation and maintaining high signal-to-noise ratio without significantly increasing circuit complexity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs periodic reset action through the reset pulse signal generation module. The circuit performs periodic amplification followed by periodic resetting, creating a cyclic operation mode that continuously maintains optimal signal-to-noise ratio while managing circuit complexity through rhythmic operation

Inventive Principle:

Principle #19Periodic action

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 circuit operates reliably in high temperature and high irradiation conditions, reducing noise, improving signal-to-noise ratio, and increasing signal processing speed, enabling effective signal response in intense input signals.

Implementation Method 1

the silicon carbide-based junction field-effect transistor...configured for reading a first output signal output by the semiconductor radiation detector, amplifying the first output signal

Methodology Applied

Scientific EffectField-effect transistor amplification:

Implementation Method 2

configured to perform amplification and high-pass filtering processing on the first amplified signal to obtain and output a target signal

Methodology Applied

Scientific EffectSignal amplification:

Implementation Method 3

perform amplification and high-pass filtering processing

Methodology Applied

Scientific EffectHigh-pass filtering: Filter (electronic)

Implementation Method 4

outputting a high-level first control signal by the voltage comparison unit to the reset pulse width modulation unit based on the first amplified signal

Methodology Applied

Scientific EffectVoltage comparison:

Implementation Method 5

outputting a reset pulse signal by the reset pulse width modulation unit to the reset pulse amplifying unit based on the high-level first control signal

Methodology Applied

Scientific EffectPulse width modulation:

Data Source

PatentUS12455391B2Reset-type charge-sensitive amplifying circuit, and method for amplifying and resetting data signal

Publication Date: 2025.10.28 NANJING UNIV

AI summary

Provided are a reset-type charge-sensitive amplifying circuit, and a method for amplifying and resetting a data signal. The reset-type charge-sensitive amplifying circuit includes a signal input buffer module, a signal output amplifying module, and a reset pulse signal generation module. The signal input buffer module is connected to the signal output amplifying module, a first terminal of the signal input buffer unit is electrically connected to a semiconductor radiation detector, and a second terminal of the signal input buffer unit is electrically connected to a voltage bias unit. The signal output amplifying module is connected to the reset pulse signal generation module. The reset pulse signal generation module includes a voltage comparison unit, a reset pulse width modulation unit, and a reset pulse amplifying unit.