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Preamplifier for electric-current noise measurements at low temperatures (1996)

Birk , H. ; Oostveen, K. ; Schönenberger , C.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 67 (1996), S. 2977-2980

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: We have developed a current preamplifier that operates in a liquid-helium bath cryostat. It has been optimized for the measurement of dynamical electric-current fluctuations (noise) of high-impedance sources R(approximately-greater-than)100 MΩ. A bandwidth of up to 400 kHz has been achieved by effectively minimizing the capacitance of the input transistor with a dynamical feedback. The amplifier measures current noise in a scanning tunneling microscope (STM). It enables the measurement of shot noise for currents as low as 30 pA (sampling rate 5 s) for a high-impedance source with a resistance of R(approximately-greater-than)1 GΩ, a value typical for tunneling resistances in STM. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1147083

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