Reconfigurable Current-Sensing Amplifier for Wide DUT Impedance Range
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Solution Overview
Problem
Conventional amplifier systems are limited in their ability to measure a wide range of currents from devices under test (DUTs) with varying impedances, often requiring dedicated components and experiencing instability under certain load conditions.
Innovation Solution
The development of an amplifier system with a controllable sensing circuit, a first amplifier for driving the DUT, and a second amplifier for generating a measurement signal, along with a control circuit to manage the impedance of the sensing circuit, allowing for reconfigurable operation suitable for diverse DUTs across multiple decades of current measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional amplifier systems use fixed sensing circuits, then the circuit is simple to design, but it cannot measure a wide range of currents from DUTs with varying impedances
Solution Approach 1:
The sensing circuit is made dynamically reconfigurable through switchable impedance elements that can be adjusted based on the DUT characteristics. The control circuit dynamically selects appropriate impedance values to match different DUT types, enabling the amplifier to adapt to varying current ranges without requiring multiple dedicated circuits.
Solution Approach 2:
The sensing circuit impedance parameters are made variable rather than fixed. By changing the impedance values of the sensing circuit based on detected DUT characteristics, the amplifier system can measure currents across multiple decades while maintaining stability and accuracy for different impedance conditions.
2Measurement precision
If dedicated components are used for each DUT type, then measurement accuracy is improved, but device complexity and component requirements increase
Solution Approach 1:
A single amplifier system is designed to perform multiple measurement functions across different current ranges and DUT types. The reconfigurable sensing circuit allows one amplifier to replace multiple dedicated amplifiers, achieving universal applicability while maintaining measurement precision through adaptive impedance matching.
Solution Approach 2:
The control circuit uses feedback from the detected DUT characteristics to automatically adjust the sensing circuit impedance. This closed-loop approach ensures measurement accuracy is maintained across different DUT types without requiring manual component selection or switching, thereby simplifying the overall device architecture.
3Stability of the object's composition
If the amplifier operates with fixed impedance sensing circuit, then the circuit is stable, but it experiences instability under certain load conditions with varying DUT impedances
Solution Approach 1:
The sensing circuit transitions from a static fixed-impedance design to a dynamic reconfigurable design. The control circuit monitors load conditions and adjusts the sensing impedance in real-time to maintain amplifier stability across varying DUT impedances, preventing oscillation while adapting to different load requirements.
4Adaptability or versatility
If multiple dedicated amplifiers are used for different current ranges, then measurement coverage is improved, but device complexity and cost increase
Solution Approach 1:
One amplifier system is designed to provide multiple measurement ranges through the reconfigurable sensing circuit. By making the sensing impedance adjustable rather than using multiple dedicated amplifiers, the system achieves wide current range coverage (multiple decades) while reducing overall system complexity and component count.
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
This solution enables flexible and stable current measurement across a wide range of DUT impedances, preventing oscillation and ensuring accurate measurement without the need for dedicated components, thus enhancing the amplifier's configurability and usability.
Implementation Method 1
a controllable sensing circuit... controlling an impedance of the controllable sensing circuit... generating a voltage across the controllable sensing circuit in response to the current
Data Source
AI summary
Amplifier systems for measuring a wide range of current are provided herein. In certain embodiments, an amplifier system includes a controllable sensing circuit, a first amplifier including an output configured to drive a device under test (DUT) through the controllable sensing circuit, and a second amplifier including an input coupled to the controllable sensing circuit and operable to generate a measurement signal indicating an amount of measured current of the DUT. The amplifier system further includes a control circuit operable to control a configuration or mode of the controllable sensing circuit suitable for a particular type of DUT.