ACCURATE 2A

The ACCURATE 2A application-specific integrated circuit (ASIC) is a specialised 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 ionisation chambers for radiation monitoring and can also be used in environments where extremely low electrical currents need to be measured clearly and precisely, 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.