A. PARRA-CERRADA ET AL.

96

The NDF method is a suitable tool for direct analysis of

oscillators and it does not require any additional proviso

or conditions before using it. Another advantage of this

NDF method is that all oscillator topologies can be ana-

lyzed with a “loop-gain concept” and the main parame-

ters that the reference plane methods cannot provide are

now available for any oscillator topology.

The NDF solution is independent of the virtual ground

position and it provides the oscillation frequency at first

harmonic approximation without requiring transistor m

compression. This NDF independence is based on its

relation with the Return Relations (and T), as they

provide the “true open-loop-gain”. To sum up, the NDF/

RRT method is an optimum tool for the quasi-lineal os-

cillator analysis in a single step; it does not require any

additional proviso or verification; and it is suitable for

any oscillator topology.

RR

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