Title :
Direct IF sampling of HPA´s AM and PM noise
Author :
Hoover, Lowell ; Crespo, William ; Mitsdarffer, K. Bryan
Author_Institution :
Polyphase Microwave Inc., Bloomington, IN, USA
Abstract :
The development of a novel technique for measuring HPA (High Power Amplifiers) AM (Amplitude Modulation) and PM (Phase Modulation) 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 :
amplifiers; amplitude modulation; analogue-digital conversion; noise measurement; phase modulation; phase noise; signal sampling; 16-bit high-speed digitizer; AM noise; HPA; PM noise; amplitude modulation; digital demodulation; direct IF sampling; dual channel microwave downconverter; high power amplifiers; phase modulation; Cranes; Demodulation; Floors; Noise measurement; Phase noise; Prototypes;
Conference_Titel :
AUTOTESTCON, 2010 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-7960-3
DOI :
10.1109/AUTEST.2010.5613621
