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In this thesis, the phase noise of oscillator in UHF band is
intensivelystudied. The part from voltage-dependent junction
capacitance of transistor are carefully studied, which is not
discussed in Lesson's model. The pahse noise is calculated by
nonlinear CAD program with harmonic balance method. The noise
from junction capacitance is calculated by SDD technique. The
condition for achieving low phase noise are elucidated. A low
phase noise oscillator by lump element at 2.5 GHz is
fabricated, base on the simulation. The phase noise at 10KHz
offset is about 98 dBc/Hz, which is quite good for commercial
application.
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