An Active “Cold” Noise Source

Robert H. Frater, David R. Williams

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)


An active circuit which behaves like a “cold” noise source is described. The circuit, which uses a gallium arsenide FET is given the name COLFET. The appropriate theory is developed and practical circuits described using the circuit. Equivalent noise temperatures of less than 50 K have been measured for a 50–Ω source at 1400 MHz.

Original languageEnglish
Pages (from-to)344-347
Number of pages4
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number4
Publication statusPublished - 1981
Externally publishedYes


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