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Rigorous Q-factor formulation for one- and two-port passive linear networks from an oscillator noise spectrum viewpoint

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1 Author(s)
Ohira, T. ; ATR Wave Eng. Labs., Kyoto, Japan

This brief characterizes one- and two-port passive networks from the viewpoint of oscillator design. A linear circuit theory derives the spectral spread due to RF noise from active devices. The formulation finds a frequency derivative function of logarithmic immittance that plays the key role of dominating the spectrum behavior. This leads to an explicit definition of the Q factor by referring to Leeson's basic oscillator model. The derived definition can provide an effective criterion for circuit topology and parameter optimization in low-noise oscillator design.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:52 ,  Issue: 12 )

Date of Publication:

Dec. 2005

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