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Inductor-Based Tuning in LC -Quadrature Oscillators: A Comparative Study

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2 Author(s)
El Gouhary, A. ; Iowa State Univ., Ames, IA, USA ; Neihart, N.M.

This brief analyzes three different mechanisms for injecting a tuning current into the tank of inductively tuned LC-quadrature oscillators. It is shown that, by controlling how the tuning current is injected into the tank, either by magnetic coupling, direct coupling, or the newly proposed partial coupling, a tradeoff exists between tuning range, phase noise, and power consumption. This leads to a very flexible design methodology where the coupling mechanism can be selected based on system-level requirements, which may change from one design to the next.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:59 ,  Issue: 9 )