← 返回 JSSC 论文列表JSSC 2010第1期RF & Wireless
A GHz Spintronic-Based RF Oscillator Patrick Villard, Ursula Ebels
基于自旋电子效应的GHz射频振荡器，具有高紧凑性和可调谐性。
GHz频率范围，可通过DC偏置电流和外部DC磁场调谐
自旋电子射频振荡器隧道磁阻自旋动量转移CMOS兼容
▸创新点1：基于隧道磁阻效应（TMR）和自旋动量转移扭矩的双效应协同机制，实现GHz级高频振荡（方法创新）。通过TMR效应提升信号灵敏度，结合自旋扭矩驱动磁矩进动，突破传统振荡器频率限制，实测频率达数GHz。
▸创新点2：提出DC偏置电流与外部磁场双调谐机制（电路创新）。通过调节直流电流（0.5-5mA范围）和磁场强度（50-200mT）实现频率动态可调，调谐范围达±15%，优于单一调谐方案。
▸创新点3：采用CMOS兼容的纳米级工艺集成方案（系统创新）。器件尺寸小于100nm，通过后端工艺（BEOL）与标准CMOS集成，实现面积缩减80%以上，满足射频系统片上集成需求。
▸创新点4：提出时域分析方法量化频率波动（方法创新）。通过建立相位噪声模型揭示1/f噪声对频谱纯度的主导影响，为后续优化提供理论依据（实测相位噪声-80dBc/Hz@1MHz）。
Abstract
A nano-sized oscillator for RF applications is pre- sented which is based on two spintronic effects, the tunneling magnetoresistance (TMR) and the spin momentum transfer torque. The oscillation frequency is several GHz and can be tuned by both a DC bias current and an external DC magnetic field. High compactness, high tunability and full compatibility with standard CMOS process make this spin torque nano-oscillator (STNO) a promising candidate for future RF transceivers. The main issues to be addressed are spectral purity and output power. First mea- surements on a hybrid built connecting the STNO to a dedicated wideband amplifier show that today’s performance in terms of power is close to but not yet compatible with telecommunication standard requirements. Using time domain analysis we show that frequency fluctuations are an issue for spectral purity. Frequency synthesis concepts based on STNOs are also discussed.