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Noise-optimized ultrastable low-noise current amplifier.

C Krause1, D Drung1, M Götz2

  • 1Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin, Germany.

The Review of Scientific Instruments
|February 3, 2019
PubMed
Summary
This summary is machine-generated.

A new ultrastable low-noise current amplifier (ULCA) significantly reduces measurement uncertainty at low currents. This advancement utilizes a novel thin-film resistor network, achieving a noise level of 1.6 fA/√Hz.

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Area of Science:

  • Electrical Engineering
  • Metrology
  • Quantum Electronics

Background:

  • Accurate current measurements are crucial in various scientific and industrial applications.
  • Existing low-noise current amplifiers face limitations in reducing uncertainty at very low current levels.
  • Advancements in amplifier design are needed to meet the demands of high-precision measurements.

Purpose of the Study:

  • To develop and characterize a noise-optimized ultrastable low-noise current amplifier (ULCA).
  • To reduce measurement uncertainty for low current levels.
  • To evaluate the stability and performance of the novel ULCA design.

Main Methods:

  • Implementation of a thin-film resistor network with a high-ohmic path (6.75 GΩ).
  • Conducting noise investigations, short-term, and long-term stability studies.
  • Measuring input current gain stability using a cryogenic current comparator (±6.1 nA).
  • Developing and verifying methods for low input current accuracy (≈100 pA) below 10⁻⁷ uncertainty.

Main Results:

  • Achieved a reduced noise level of 1.6 fA/√Hz.
  • Demonstrated stability of the input current gain.
  • Verified measurement accuracy at low input currents.
  • The noise-optimized ULCA shows improved performance compared to the 2014 standard variant.

Conclusions:

  • The noise-optimized ULCA successfully reduces the noise floor without compromising transresistance stability.
  • This development enhances measurement accuracy at low currents.
  • The novel ULCA design offers significant improvements for precision current metrology.