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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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