ELECTROMETRIC AMPLIFIER FOR LEAK DETECTOR Russian patent published in 1994 - IPC

FIELD: electronic technology. SUBSTANCE: electrometric amplifier for leak detector has first and second field-effect transistors 1 and 2, source 3 of positive voltage, first and second resistors 4 and 5, variable resistor 6, third and fourth resistors 7 and 8, source 9 of negative voltage, first and second operational amplifiers 10 and 11, output amplifier 12, feedback resistor 13, first and second source resistors 14 and 15. Due to more accurate compensation of parasitic current of drain-gate of first field-effect transistor expansion of range of input currents is achieved. EFFECT: expanded range of input currents. 1 dwg