Title :
NFRAD - Review of the New Nist Noise Measurement System
Author :
Grosvenor, C.A. ; Randa, J. ; Billinger, R.L.
Author_Institution :
National Institute of Standards and Technology, 325 Broadway, Mail Stop 813.01, Boulder, CO 80303, Tel.: (303) 497-5958 Fax: (303) 497-3970 e-mail: chriss@boulder.nist.gov
Abstract :
The National Institute of Standards and Technology (NIST) has completed design and testing of a new noise measurement system. The new system is capable of measuring noise temperature at multiple frequencies about ten times faster than previous NIST systems. This system will also be used to measure the noise parameters of amplifiers. Required reflection coefficients used to calculate mismatch and asymmetry are no longer measured by a six-port reflectometer in each noise measurement. Instead, they are measured with a vector network analyzer and stored in lookup tables. We have tested radiometers in the frequency ranges 4-8 GHz, 8-12 GHz, and 12-18 GHz. The system tests will be discussed as well as measurements and uncertainty analysis.
Keywords :
Acoustic reflection; Frequency measurement; Measurement uncertainty; NIST; Noise measurement; Radiofrequency amplifiers; Radiometers; System testing; Table lookup; Temperature measurement;
Conference_Titel :
ARFTG Conference Digest-Spring, 55th
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5686-1
DOI :
10.1109/ARFTG.2000.327413
