Preamplifier Deadtime Control Circuit for Output Saturation Prevention
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Solution Overview
Problem
In high radiation environments, preamplifiers experience output saturation due to the pile-up phenomenon, where charge accumulates in the feedback capacitor, leading to errors and reduced measurement efficiency. Additionally, the self-initialization circuit results in deadtime, where input current is omitted during initialization, further deteriorating measurement efficiency.
Innovation Solution
The implementation of a preamplifier with an active deadtime control circuit, utilizing a comparator and a Monostable circuit, actively controls deadtime based on the radiation environment. This circuit initializes the preamplifier by using the comparator and Monostable circuit to prevent output saturation and reduce deadtime, thereby enhancing measurement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-initialization circuit is used to prevent pile-up phenomenon, then output saturation is prevented, but deadtime increases and measurement efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the deadtime period adaptive rather than fixed. The control circuit dynamically adjusts the duration of the deadtime period based on the output signal characteristics, shortening it when signal amplitude is low and extending it when signal amplitude is high, thereby optimizing both saturation prevention and measurement efficiency under varying conditions
Solution Approach 2:
The patent changes the parameter of deadtime duration from a fixed value to a variable parameter controlled by the control circuit. By monitoring the output signal amplitude and adjusting the deadtime period accordingly, the system achieves parameter optimization that balances saturation prevention with minimal measurement efficiency loss
2Reliability
If the feedback capacitor is fully discharged during initialization, then output saturation is prevented, but the input current signal is omitted and measurement efficiency deteriorates
Solution Approach 1:
The patent applies partial action by discharging the feedback capacitor to a controlled extent rather than complete discharge. The control circuit monitors the discharge process and stops it before full discharge, achieving sufficient saturation prevention while minimizing the deadtime period and preserving more input current signals
3Measurement precision
If the preamplifier operates in high radiation environment with fast signal generation, then signal detection capability is maintained, but charge accumulates in feedback capacitor causing output saturation
Solution Approach 1:
The patent applies feedback by implementing a control circuit that continuously monitors the output signal of the preamplifier and uses this information to control the discharge of the feedback capacitor. The feedback mechanism detects when charge accumulation approaches saturation levels and triggers appropriate discharge action, maintaining reliable operation in high radiation environments
Data Source
AI summary
Provided is a preamplifier with an active deadtime control circuit, which may include: an operational amplifier to which input current and common voltage are applied; a feedback capacitor of which both ends are connected to a first input terminal of the operational amplifier to which the input current is applied and an output terminal of the operational amplifier; a comparator comparing output voltage converted from the input current by the operational amplifier, and reference voltage to output a comparison signal; and a Monostable circuit outputting a switching signal for switching charging or discharging of the feedback capacitor based on the comparison signal.