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Through theoretical deduction, two new explanations of Leeson model are presented: the corner frequency of high Q oscillators in the phase noise curve should be the frequency at the intersection of the f 0 curve segment after adding 3 dB and the f −1 curve segment; f0/2QL of low Q oscillators in the phase noise curve should also be the frequency at the intersection of the f 0 curve segment after adding...
The methods to reduce phase noise of crystal oscillators are presented and analyzed in the paper. According to analysis of Leeson formula, phase noise has a direct relation with noise factor F, corner frequency fc and loaded quality factor QL. Based on the method of reducing phase noise by improving QL, the formula of QL is derived by analysis of Pierce oscillator circuit and simulated by MATLAB....
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