A current to voltage converter for cryogenics using a CMOS operational amplifier

K. Hayashi, K. Saitoh, Y. Shibayama, Keiya Shirahama

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have constructed a versatile current to voltage (I-V) converter operating at liquid helium temperature, using a commercially available all-CMOS OPamp. It is valuable for cryogenic measurements of electrical current of nano-pico amperes, for example, in scanning probe microscopy. The I-V converter is thermally linked to liquid helium bath and self-heated up to 10.7 K. We have confirmed its capability of a transimpedance gain of 106 V/A and a bandwidth from DC to 200 kHz. In order to test the practical use for a frequency-modulation atomic force microscope, we have measured the resonance frequency shift of a quartz tuning fork at 32 kHz. In the operation of the I-V converter close to the sensor at liquid helium temperature, the signal-to-noise ratio has been improved to a factor of 13.6 compared to the operation at room temperature.

Original languageEnglish
Article number012016
JournalJournal of Physics: Conference Series
Volume150
DOIs
Publication statusPublished - 2009

Fingerprint

operational amplifiers
liquid helium
cryogenics
converters
CMOS
electric potential
forks
frequency modulation
frequency shift
baths
signal to noise ratios
quartz
direct current
tuning
microscopes
microscopy
bandwidth
scanning
temperature
probes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

A current to voltage converter for cryogenics using a CMOS operational amplifier. / Hayashi, K.; Saitoh, K.; Shibayama, Y.; Shirahama, Keiya.

In: Journal of Physics: Conference Series, Vol. 150, 012016, 2009.

Research output: Contribution to journalArticle

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