# Technology The JS220+ leverages new components and techniques to achieve nanoamp accuracy. The improvements include: - Improved guard traces for reduced leakage. - Replaced the 18 µA current range selection MOSFET for one with lower gate-source leakage. - Redesigned analog front-end for lower input bias current and better temperature stability. - Redesigned anti-aliasing filter for improved temperature stability. - Redesigned ADC reference and level shift for improved temperature stability. - Redesigned voltage ESD solution, dramatically reducing leakage currents. - Migrated to Rogers 4003C PCB material for both the main PCB and front panel PCB. Rogers 4003C has 1000x higher resistivity than FR4 for significantly reduced current leakage.