Title :
7.5: Direct IF sampling of TWT AM and PM noise
Author :
Mitsdarffer, K. Bryan ; Crespo, William F. ; Hoover, Lowell R.
Author_Institution :
Crane Div., Naval Surface Warfare Center, Crane, IN, USA
Abstract :
The development of a novel technique for measuring TWT AM and PM noise is reported. The new method utilizes a dual channel microwave downconverter and a 16-bit high-speed digitizer to directly sample the IF allowing digital demodulation of AM and PM noise simultaneously. A prototype AM/PM noise measurement system has been built with a measurement single-sideband noise floor of -155 dBc/Hz at 100 kHz offset from the carrier.
Keywords :
amplitude modulation; demodulation; microwave frequency convertors; noise measurement; phase noise; travelling wave tubes; IF sampling; TWT AM noise; TWT PM noise; digital demodulation; dual channel microwave downconverter; high-speed digitizer; measurement single-sideband noise floor; noise measurement system; Cranes; Demodulation; Detectors; Noise measurement; Optical noise; Phase measurement; Phase noise; Prototypes; Radio frequency; Sampling methods;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2010 IEEE International
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-7098-3
DOI :
10.1109/IVELEC.2010.5503587
