Measurements on Low Frequency Phase and Amplitude Fluctuations and Its Application to Reduce the Noise in Bipolar Transistor Circuits

Keiji TAKAGI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E78-B   No.2   pp.279-280
Publication Date: 1995/02/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on Electromagnetic Compatibility)
Category: 
Keyword: 
electromagnetic compatibility,  communication device and circuit,  measurement and metrology,  communication systems and transmission equipment,  

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Summary: 
A system for measuring the low frequency amplitude and phase noises was set-up, with employing a phase sensitive detector and phase-shifter. It is noted that both noises were partly correlated. The phase noise was explained by the transit time fluctuation due to the fluctuating diffusion coefficient. The amplitude noise reduction was demonstrated by applying the inverted output of the phase noise to the amplitude noise.