【摘要】 设计了工作在2GHz,差分控制的单片LC压控振荡器,并利用0.18μmCMOS工艺实现.利用模拟和数字(4位二进制开关电容阵列)调频技术,压控振荡器的调频范围达到16.15%(1.8998~2.2335GHz).在2.158GHz工作频率下,在1MHz频偏处的相位噪声为-118.17dBc/Hz.应用给出的开关设计,相位噪声在不同的数字位控制下变化不超过3dB.由于利用pn结二级管作为变容管,在调频范围内,相位噪声仅改变约2dB.压控振荡器在1.8V电源电压下消耗2.1mA电流并能够在1.5V电源电压下正常工作.更多还原

【Abstract】 A 2GHz differentially tuned CMOS monolithic LC-VCO is designed and fabricated in a 0.18μm CMOS process.The VCO has a 16.15% tuning range (from 1.8998 to 2.2335GHz) through a combination of analog and digital tuning techniques (4-bit binary switch-capacitor array).The measured phase noise is -118.17dBc/Hz at a 1MHz offset from a 2.158GHz carrier.With the presented improved switch,the phase noise varies no more than 3dB at different digital control bits.The phase noise changes only by about 2dB in the tuning range because of the pn-junctions as the varactors.The VCO draws a current of about 2.1mA from a 1.8V power supply and works normally with a 1.5V power supply.更多还原