Modeling of the Oscillator Pulling Effects within a Phase-Locked Loop

• Main Authors: Yu-Cheng Lai, 賴昱澄
• Other Authors: Chien-Jung Li
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/weu95x

碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 101 === 　　In the wireless communication systems, the local oscillator (LO) is usually based on the phase-locked loop (PLL) in the transceiver to generate a carrier with purity. The spectral purity of the synthesized output is one of the reasons that affect the system output quality. Since the oscillator is susceptible to the interferences, the PLL output spectrum is subject to degradation due to external disturbances. It is difficult to analyze the oscillator under injection, because of the highly nonlinear mechanism, unless some particular conditions are restricted. This thesis has developed an injection-locked oscillator (ILO) model based on the discrete-time algorithm driven from the Adler’s equation. The developed ILO model can lead the designers to evaluate the influence of injection in a simple manner. In this study, the accuracy of the ILO model was experimentally examined. The model was finally applying itself to a 2.4 GHz phase- and self-injection-locked (PSIL) radar to predict the vital-sign sensing results.