High-Precision ASIC for Ultra-Low Current Measurements spanning from -1 fA to -20 μA
Highlights
Wide Dynamic Range
Measures currents from -1 fA to -20 µA with a resolution of 0.2 fA, without band switching.
Advanced Features
Low leakage of 4 fA for bare die version. Asynchronous operation with acquisition time proportional to input current.
High Accuracy
Maintains a global error smaller than ±2% at 25°C across its full measurement range.
Proven Performance
Extensively tested at research facilities and medical institutions.
Keywords
Ultra-low current, ASIC, current measurement, radiation monitoring, high resolution, precision instrumentation.
The ACCURATE 2A ASIC is a specialized ultra-low current measurement device, designed for detailed electrical measurements ranging from 1 femtoamperes to 20 microamperes. This ASIC is primarily deployed as a front-end sensor interface in ionization chambers for radiation monitoring and is applicable in other sensitive measurement environments such as photodiode signal processing and current/charge-output sensor systems. Designed using a 130 nm process technology, the device features a compact die area of 1.95mm² and includes 26 input/output pads that enable flexible connectivity configurations.
The device employs a current-to-frequency conversion technique alongside a direct slope current measurement method to achieve a minimum resolution of 0.2 fA. It operates efficiently with a power consumption of 3 mW from a 3.3 V supply. The integrated circuit includes OTA, comparators, charge pumps, and a clock generator that collectively contribute to its high performance and measurement precision.
Advantages
Technical Precision
The ASIC distinguishes itself by maintaining a consistent accuracy across a broad dynamic range without the need for band switching. The demonstrated
global accuracy of ±2 % at 25 °C, sets a new benchmark in ultra-low current measurement.
Validated in rigorous environments
The ASIC’s design and functionality have been thoroughly validated under rigorous conditions at leading research facilities and medical centers. The testing confirms its robustness and suitability for integration into high-stakes environments where precise current measurement is critical.
Integration Versatility
Designed multiple operational modes, the ACCURATE 2A offers exceptional adaptability for technical integrations, making it suitable for a wide range of electronic assemblies where precise current measurement is critical.