Development of Low Phase Noise Oscillators Based on Microwave Ring Filters

• Main Authors: Hsuan Chang, 張藼
• Other Authors: Chao-hsiung Tseng
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/83489911860676481507

碩士 === 國立臺灣科技大學 === 電子工程系 === 100 === In this thesis, the low phase-noise oscillators (OSCs) and voltage-controlled oscillators (VCOs) are developed using ring filter, which are treated as the frequency selective element of the feedback OSCs and VCOs. The “complex quality factor” is first introduced to designate the oscillation frequency of the OSC for the improvement of phase-noise performance. The experimental results in this thesis demonstrate that a tunable ring filter can realize a low phase-noise VCO. In addition, it also imply that the selection method of the oscillation frequency proposed in this thesis is effective. Based on the proposed method, the developed OSC has a -132.2 dBc/Hz. However, using” group delay peak” to select the oscillation frequency only achieves a -125.1 dBc/Hz phase noise. The developed VCO has phase noises better than -110 dBc/Hz over the entire tunable range from 2.10 GHz to 1.69 GHz (10%). The above-mentioned phase noises are all measured at the 1 MHz offset frequency.