A transimpedance amplifier for ultralow current scanning tunneling microscopy has been developed. Conditions for maximum signal-to-noise ratio have been explored, showing that best results can be obtained with a simple circuital arrangement. The amplifier associates a very high amplification factor (0.5 V/pA) to a sufficiently wide bandwith (1.6 kHz) and very low noise current (49 fA). Those features enable microscopy studies on an almost insulating surface, as a freshly cleaved mica surface.
Development of an ultra low current amplifier for scanning tunneling microscopy / M. CARLA'; LEONARDO LANZI; EMILIANO PALLECCHI; GIOVANNI ALOISI. - In: REVIEW OF SCIENTIFIC INSTRUMENTS. - ISSN 0034-6748. - STAMPA. - 75:(2004), pp. 497-497.
Development of an ultra low current amplifier for scanning tunneling microscopy
CARLA', MARCELLO;ALOISI, GIOVANNI DOMENICO
2004
Abstract
A transimpedance amplifier for ultralow current scanning tunneling microscopy has been developed. Conditions for maximum signal-to-noise ratio have been explored, showing that best results can be obtained with a simple circuital arrangement. The amplifier associates a very high amplification factor (0.5 V/pA) to a sufficiently wide bandwith (1.6 kHz) and very low noise current (49 fA). Those features enable microscopy studies on an almost insulating surface, as a freshly cleaved mica surface.
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