Title :
An 8 mm FM and AM noise measuring equipment
Author :
Deng Minren ; Xu Dezhong
Author_Institution :
Beijing Inst. Radio. Metrol. & Meas., China
Abstract :
FM/AM noise measurement equipment in which a resonator cavity is used as a discriminator to measure the noise of a single oscillator is described. A very-high-Q reflection-type tunable cavity and a circulator are used as the FM discriminator. The threshold for FM noise measurement is -120 dBc/Hz (f=50 kHz). For AM noise measurement it is -158 dBc/Hz (f=50 kHz). FM and AM noise measurement results for a Gunn oscillator and a phase-locked signal source at 8-mm waveband with an uncertainty of about 3 dB are given.<>
Keywords :
amplitude modulation; cavity resonators; electric noise measurement; frequency modulation; microwave measurement; 8 mm; AM; FM; Gunn oscillator; circulator; discriminator; noise measuring equipment; phase-locked signal source; resonator cavity; single oscillator; very-high-Q reflection-type tunable cavity; Bandwidth; Detectors; Frequency measurement; Frequency modulation; Millimeter wave measurements; Noise measurement; Oscillators; Switches; Testing; Voltage;
Conference_Titel :
Microwave Symposium Digest, 1989., IEEE MTT-S International
Conference_Location :
Long Beach, CA, USA
DOI :
10.1109/MWSYM.1989.38934
