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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