Analytic investigation of frequency sensitivity in microwave oscillators: Application to the computation of phase noise in a dielectric resonator oscillator |
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Authors: | Olivier Llopis Jean-Marc Dienot Jacques Verdier Robert Plana Michel Gayral Jacques Graffeuil |
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Institution: | 1. LAAS-CNRS, 7 avenue du Colonel Roche, F-31077, Toulouse, France 2. Université Paul Sabatier, 118 route de Narbonne, F-31062, Toulouse, France
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Abstract: | The conversion of low frequency noise into phase noise in microwave oscillators is studied through an analytical calculation of the pushing factor. This calculation is based on a simplified equivalent circuit for two types of active devices : field effect transistors (Fet) and heterojunction bipolar transistors (hbt). The preeminence in the conversion process of the gate- source capacitance in theFet and the base- emitter junction in thehbt is pointed out. Practical methods are proposed to reduce the phase noise in these circuits. |
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