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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Prediction, simulation, and verification of the phase noise in 80-MHz low-phase-noise crystal oscillators
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Prediction, simulation, and verification of the phase noise in 80-MHz low-phase-noise crystal oscillators

机译：80 MHz低相位噪声晶体振荡器中相位噪声的预测，仿真和验证

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摘要

To predict the phase noise in an 80-MHz crystal oscillator, on the basis of the classical Leeson model, we analyzed and selected the oscillator noise figure F and transistor corner frequency f reasonably, and then calculated the loaded Q (Q) value of the oscillator according to the parameters in the selected Butler oscillation circuit. Thus, we obtained the predicted phase noise in an 80-MHz crystal oscillator according to the Leeson phase noise formula. Next, the simulation curve of the phase noise in this 80-MHz low-phase-noise crystal oscillator was obtained by establishing a transistor nonlinear model using commercial design software. Then, we debugged the 80-MHz low-phase-noise crystal oscillator prototype under the guidance of the prediction and simulation results and tested it. The measured results show that the phase noise predicted after selecting reasonable parameters for the Leeson model and the ADS simulation curve of the phase noise obtained by using the nonlinear transistor model are both close to the actual measured result. This result may be beneficial in simplifying the design process for low-phase-noise crystal oscillators.
机译：为了预测80 MHz晶体振荡器中的相位噪声，我们在经典Leeson模型的基础上，合理地选择了振荡器噪声系数F和晶体管转折频率f，然后计算出其的加载Q（Q）值。振荡器根据在巴特勒振荡电路中选择的参数。因此，我们根据Leeson相位噪声公式获得了80 MHz晶体振荡器中的预测相位噪声。接下来，通过使用商业设计软件建立晶体管非线性模型，获得了该80MHz低相位噪声晶体振荡器中相位噪声的仿真曲线。然后，我们在预测和仿真结果的指导下调试了80MHz的低相位噪声晶体振荡器原型并对其进行了测试。测量结果表明，为Leeson模型选择合理的参数后预测的相位噪声和使用非线性晶体管模型获得的相位噪声的ADS仿真曲线都接近于实际测量结果。该结果可能有助于简化低相位噪声晶体振荡器的设计过程。

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