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设计了一种20M低相位噪声晶体振荡器。通过对振荡原理的分析,选取了Santos结构的振荡器进行设计。该晶体振荡器由主振荡电路、振幅控制电路两部分组成,用标准的0.18μm CMOS工艺实现,并通过Cadence平台下的软件进行仿真。结果表明,所设计的晶体振荡器的相位噪声在偏离中心频率1kHz、10kHz、1MHz处的相位噪声分别为:-121dBc/Hz、-145dBc/Hz、-165dBc/Hz,性能比较理想,可以满足射频芯片对晶体振荡器高相位噪声性能的需要。
A 20M low phase noise crystal oscillator is designed. Through the analysis of the principle of oscillation, we choose the oscillator of Santos structure to design. The crystal oscillator consists of the main oscillator circuit, the amplitude control circuit of two parts, with a standard 0.18μm CMOS technology, and through Cadence platform software simulation. The results show that the phase noise of the designed crystal oscillator is -121dBc / Hz, -145dBc / Hz and -165dBc / Hz respectively at the deviations from the center frequency of 1kHz, 10kHz and 1MHz, which can meet the requirements of radio frequency The need for high phase noise performance of the crystal on a chip.