NIST logo

Publication Citation: Precision Measurement Method for Cryogenic Amplifier Noise Temperatures Below 5 K

NIST Authors in Bold

Author(s): James P. Randa; Eyal Gerecht; Dazhen Gu; Robert L. Billinger;
Title: Precision Measurement Method for Cryogenic Amplifier Noise Temperatures Below 5 K
Published: March 01, 2006
Abstract: We report precision measurements of the effective input noise temperature of a cryogenic (liquid helium temperature) MMIC amplifier at the amplifier reference planes within the cryostat. A method is given for characterizing and removing the effect of the transmission lines between the amplifier reference planes and the input and output connectors of the cryostat. In conjunction with careful noise measurements,this method enables us to measure amplifier noise temperatures below 5 K with an uncertainty of 0.3+- K. The particular amplifier that was measured exhibits a noise temperature below 5.5K from 1 to 11 GHz, attaining a minimum value of 2.3K+- 0.3K at 7 GHz. The measured amplifier gain is between 33.4dB+- 0.3 dB and 35.8 dB +- 0.3 dB over the 1-12 GHz range.
Citation: IEEE Transactions on Microwave Theory and Techniques
Volume: 54
Issue: 3
Pages: pp. 1180 - 1189
Keywords: amplifier noise, cryogenic MMIC amplifier, noise temperature, noise measurement, thermal noise
Research Areas: Electronics & Telecommunications, Microelectronics, Electromagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (2MB)