Comparator-Based Current Measurement Without Precision ADCs
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Solution Overview
Problem
Current leakage current measurement techniques are complex and require precision measurement circuitry, such as high-resolution digitizers or analog-to-digital converters, which are costly and unnecessary for accurate leakage current determination in electronic circuits.
Innovation Solution
A probabilistic technique using a comparator circuit to measure leakage current by comparing an input signal to a reference voltage, determining the proportion of output decisions meeting a criterion, and calculating the corresponding voltage value, allowing for current measurement without the need for explicit reference voltages or high-cost ADCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional precision measurement circuitry (high-resolution digitizer or ADC) is used to measure leakage current, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex precision measurement equipment (high-resolution ADCs and digitizers) with a simple comparator circuit that uses basic components. The comparator performs multiple quick measurements and uses statistical analysis to achieve accurate leakage current measurement without requiring costly precision hardware. This embodies the principle of using simple, inexpensive measurement means instead of complex expensive equipment.
Solution Approach 2:
The patent changes the measurement approach from direct precision analog measurement to statistical analysis of multiple digital comparator outputs. By taking multiple measurements and analyzing the distribution of comparator output decisions, the system achieves precise leakage current determination through parameter transformation rather than relying on high-resolution analog-to-digital conversion hardware.
2Measurement precision
If traditional precision measurement circuitry is used, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent replaces expensive, complex precision measurement equipment (high-resolution ADCs and digitizers) with a simple comparator circuit that uses basic components. The comparator performs multiple quick measurements and uses statistical analysis to achieve accurate leakage current measurement without requiring costly precision hardware. This embodies the principle of using simple, inexpensive measurement means instead of complex expensive equipment.
3Device complexity
If a simple comparator circuit is used instead of precision measurement equipment, then device complexity is reduced, but measurement precision may worsen
Solution Approach 1:
The patent divides the measurement process into multiple discrete comparator measurements rather than relying on a single high-resolution measurement. By segmenting the measurement into multiple trials and analyzing the statistical distribution of results, the system achieves precise leakage current determination despite each individual comparator measurement being coarse. This segmentation approach transforms multiple low-precision measurements into high-precision results through statistical analysis.
Solution Approach 2:
The patent uses feedback by analyzing the distribution of comparator output decisions from multiple measurements. The statistical analysis of these feedback signals allows the system to determine the leakage current with high precision, compensating for the inherent coarseness of individual comparator measurements through iterative statistical evaluation.
4Measurement precision
If probabilistic technique with multiple trials is used, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent performs a specified count of comparator measurements that is sufficient to achieve the desired statistical confidence level for accurate leakage current determination. By performing the minimum necessary number of measurements rather than excessive measurements, the system achieves measurement accuracy while minimizing measurement time, optimizing the trade-off between precision and speed.
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 approach simplifies current measurement, reduces costs, and effectively determines leakage current in electronic circuits, enabling adjustments to circuit parameters to optimize power consumption and performance without requiring expensive measurement equipment.
Implementation Method 1
using the comparator circuit, comparing the input signal to a specified reference and obtaining a plurality of comparator output decisions
Data Source
AI summary
A current measurement circuit may use a probabilistic technique to determine a current from a circuit block. In one embodiment, the circuit includes a comparator circuit, a first current sensing element (such as a first resistor), and a control circuit. The first current sensing element is coupled to the comparator circuit to establish a first comparator input signal representative of the current at an input of the comparator circuit. The control circuit is coupled to the comparator circuit to obtain a first plurality of comparator output decisions corresponding to the first current sensing element for a specified count, determine a first proportion of comparator output decisions meeting a specified criterion, and determine a voltage value of the first comparator input signal from the first proportion. The control circuit is configured to determine a current value using the voltage value of the first comparator input signal and an impedance value of the first current sensing element. The current measurement circuit is relatively low-cost and easy to implement, without requiring a precision reference voltage, current, and/or high-cost analog-to-digital converters (ADCs).