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Configuration for low-noise current source utilizing discrete low-noise junction field effect transistor (JFET) biased by voltage U 0 and the feedback to program voltage source by instrumentation amplifier (IA). The basic structure is black; the red blocks and connections are added to implement a programmable low-noise current source. The source delivers the current I L for the examined sensor R S . The impedance Z L is a loading impedance to the voltage source.

Journal: Sensors (Basel, Switzerland)

Article Title: Flicker Noise in Resistive Gas Sensors—Measurement Setups and Applications for Enhanced Gas Sensing

doi: 10.3390/s24020405

Figure Lengend Snippet: Configuration for low-noise current source utilizing discrete low-noise junction field effect transistor (JFET) biased by voltage U 0 and the feedback to program voltage source by instrumentation amplifier (IA). The basic structure is black; the red blocks and connections are added to implement a programmable low-noise current source. The source delivers the current I L for the examined sensor R S . The impedance Z L is a loading impedance to the voltage source.

Article Snippet: The JFET input operational amplifiers with the lowest level of equivalent input voltage noise (at low frequencies) that we have been able to find is the OPAx140 series by Texas Instruments [ ], with an EIVN of about 50 nV/√Hz at 100 mHz, less than 16 nV/√Hz at 1 Hz, and about 5 nV/√Hz for the frequencies over 1 kHz.

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