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采用TSMC 0.18μm CMOS工艺,设计了一个中心振荡频率为2.46GHz的负阻补偿型LC压控振荡器。该压控振荡器采取差分负阻结构,利用反型NMOS电容实现频率调谐。通过对可调电容的特性研究,振荡器实现2.08GHz~2.84GHz的宽频率覆盖范围调谐,同时通过调节负阻器件的宽长比、优化片上螺旋电感几何参数获得高品质因数等方法提高振荡器的相位噪声性能。在1.8V供电电压下对电路仿真,相位噪声小于-120dBc/Hz@1 MHz,最低可达-125dBc/Hz@1 MHz,工作平均电流为3.74mA。在1.6V供电电压时工作正常,满足单芯片跳频频率综合器的应用要求。
The TSMC 0.18μm CMOS process is used to design a negative resistance compensated LC voltage controlled oscillator with a center oscillation frequency of 2.46GHz. The voltage-controlled oscillator to take a negative differential resistance structure, the use of inverted NMOS capacitor to achieve frequency tuning. Through the research on the characteristics of the tunable capacitor, the oscillator can achieve wide frequency range tuning from 2.08GHz to 2.84GHz. At the same time, the oscillator can be improved by adjusting the aspect ratio of the negative resistance device, optimizing the geometrical parameters of the on-chip spiral inductor, and obtaining the high quality factor Phase noise performance. Under the 1.8V supply voltage for circuit simulation, the phase noise is less than -120dBc / Hz @ 1MHz, the lowest up to -125dBc / Hz @ 1MHz, the average working current is 3.74mA. 1.6V supply voltage is working properly to meet the application requirements of single-chip frequency hopping frequency synthesizer.