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Cryogenic Differential Amplifier for NMR Applications.

V V Zavjalov1, A M Savin1, P J Hakonen1

  • 1Low Temperature Laboratory, Department of Applied Physics, Aalto University, PO Box 15100, 00076 Aalto, Finland.

Journal of Low Temperature Physics
|May 11, 2019
PubMed
Summary
This summary is machine-generated.

We developed a low-power cryogenic amplifier for Helium-3 NMR spectrometry. This amplifier operates at 4K, offering high impedance and a 4.4MHz bandwidth for precise measurements.

Keywords:
Cryogenic amplifierDifferential inputHEMTLow-noise

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Area of Science:

  • Physics
  • Spectroscopy
  • Cryogenics

Background:

  • Nuclear Magnetic Resonance (NMR) spectrometry requires sensitive amplification of weak signals.
  • Operating NMR experiments at cryogenic temperatures can enhance sensitivity and resolution.
  • Existing amplifiers may not be optimized for the extreme conditions of cryogenic NMR.

Purpose of the Study:

  • To design and characterize a novel cryogenic amplifier specifically for Helium-3 (He) NMR spectrometry.
  • To evaluate the amplifier's performance at cryogenic temperatures (down to 4K).
  • To assess its suitability for high-impedance signal measurement and calibration in NMR circuits.

Main Methods:

  • Design and fabrication of a cryogenic amplifier with low power consumption (<100mW).
  • Characterization of amplifier parameters including voltage gain, output resistance, bandwidth, and noise levels at 4.2K.
  • Integration and testing of the amplifier's high-impedance input and differential input capabilities.

Main Results:

  • The amplifier operates effectively down to 4K with a power consumption of <100mW.
  • Achieved a voltage gain of 45, output resistance of 146Ω, and a 4.4MHz bandwidth (DC to 4.4MHz) at 4.2K.
  • Demonstrated low voltage (1.3µV/√Hz) and current (12pA/√Hz) noise at 1MHz, yielding an optimal source impedance of 10kΩ.

Conclusions:

  • The developed cryogenic amplifier is well-suited for Helium-3 NMR spectrometry applications.
  • Its performance characteristics, including gain, bandwidth, and noise, meet the demands of cryogenic NMR measurements.
  • The amplifier offers a valuable tool for enhancing sensitivity and enabling new experimental possibilities in low-temperature NMR.