Switch-Controlled Current Amplifier for Wide Dynamic Range Measurement
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Solution Overview
Problem
Current amplifiers for measuring low-intensity direct currents from radiation detectors suffer from saturation issues and lack temperature stability, making them unsuitable for signals with large dynamics.
Innovation Solution
An amplification device with a switch-controlled amplification stage that applies different gains based on signal intensity ranges, preventing saturation and ensuring temperature stability, and includes a preamplifier and calculator to decode the output signal accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a linear current amplifier is used to amplify low-intensity direct currents, then the current can be amplified, but the amplifier is prone to saturation phenomena which makes it unsuitable for signals with large dynamics
Solution Approach 1:
The patent implements a dynamic gain switching mechanism where the amplifier automatically selects between different gain values based on the input signal level. The controller monitors the input signal and switches between first and second gain values to prevent saturation while maintaining amplification capability across a wide dynamic range, resolving the contradiction between amplification power and saturation resistance.
Solution Approach 2:
The patent changes the amplification parameter (gain) dynamically based on signal conditions. By switching between different gain values (first gain value for low signals, second gain value for higher signals), the system adapts to varying input levels and avoids saturation, thereby maintaining reliability across large dynamics while preserving amplification capability.
2Reliability
If a logarithmic amplifier is used to amplify electric currents with large dynamics, then saturation risks are reduced, but the amplifier becomes inaccurate and less temperature stable due to reliance on diodes
Solution Approach 1:
The patent extracts and eliminates the diode component from the amplification circuitry. By removing diodes (which cause temperature instability and inaccuracy) and replacing them with operational amplifiers and switching mechanisms, the system achieves saturation resistance through gain switching while maintaining measurement precision and temperature stability.
Solution Approach 2:
The patent substitutes the logarithmic transformation mechanism (based on diodes) with a linear amplification system using operational amplifiers and electronic switching. This replacement eliminates the temperature sensitivity and inaccuracy associated with diode-based logarithmic amplifiers while achieving similar saturation resistance through dynamic gain control.
3Reliability
If a logarithmic amplifier using diodes is used to handle large dynamics, then saturation is avoided, but temperature stability deteriorates
Solution Approach 1:
The patent removes diodes from the circuit, which are the source of temperature instability. By replacing diode-based logarithmic amplification with operational amplifier-based linear amplification and electronic gain switching, the system achieves saturation resistance without the temperature sensitivity inherent in diode components.
Solution Approach 2:
The patent changes the physical basis of amplification from diode junction characteristics (temperature-sensitive) to operational amplifier gain characteristics (temperature-stable). By using electronically controlled gain switching rather than diode-based logarithmic transformation, the system maintains temperature stability while achieving saturation resistance.
Data Source
AI summary
An amplification device including: a switch including an output that is suitable for being connected to a first or a second input; a first branch that is connected to the first input, which applies a first gain to generate a first amplified signal; a second branch that is connected to the second input, which applies a second gain to generate a second amplified signal; a controller for controlling the switching of the switch to apply the first or the second amplified signal to the output, depending on whether or not the value of a predetermined quantity of the first amplified signal falls within a predetermined range. The first gain and the second gain being non-zero real numbers of opposite sign.