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Published 2010 | public
Book Section - Chapter

A DC-4 GHz 270Ω Differential SiGe Low-Noise Amplifier for Cryogenic Applications


The design and measurement of a differential DC-4 GHz low-noise amplifier that is impedance matched to 270 Ω is presented in this paper. At room temperature, the amplifier has a measured gain of 29 dB with a 3 dB bandwidth of 4 GHz. To measure the noise temperature of the amplifier at cryogenic temperatures, an extension of the cold attenuator method was employed. The measured noise was found to be better than 10 K from 1-3 GHz at 24 K physical temperature. To the authors' knowledge, this is the lowest reported noise for a differential amplifier that is impedance matched to 270 Ω.

Additional Information

© 2010 EuMA. Issue Date: 27-28 Sept. 2010. Date of Current Version: 28 October 2010. We appreciate the help of Prof. D. Rutledge, Prof. A. Hajimiri, G. Jones, H. Mani, A. Babakhani, E. Long, E. Keehr, and J. Yoo. The tested circuits were processed by IBM under the TAPO Program with sponsorship of Dr. K. Johnson of the USNO.

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