45 nm MOSFET毫米波小信号等效电路模型参数提取技术

Parameter extraction technique of millimeter wave small-signal equivalent circuit model of 45 nm MOSFET

为了有效地表征45nm MOSFET毫米波频段下的电学特性,研究了其高频等效电路的建模方法。基于45nm MOSFET的器件物理结构及其导纳参数分析,通过综合考虑器件的本征物理特性、管脚及测试寄生特性,提出了一种准静态近似的高频等效电路模型及其参数直接提取的高精度简化算法,以此来统一表征模型参数从强反型区到弱反型区的偏置依赖性,并使之在不同偏置条件下的特性表征具有良好的连续性,以便于移植到商业仿真设计自动化工具中。通过ADS2013仿真工具的散射参数模拟结果与测量数据的一致性比较,验证了所建模型的实用性及其参数提取算法的准确性,并表征了45nm器件的偏置依赖性。

With the development of channel down-scaling of low-voltage low-power CMOS technology,the optimal operation points are shown to shift from the strong inversion toward lower moderated inversion and weak inversion regimes.High-frequency equivalent circuit modeling is a prerequisite for finding the physical mechanism of MOSFET device,and is essential for the HF integrated circuits.Based on the physical structure of 45 nm MOSFET device and its Y parameters analysis,a quasi-static approximate RF equivalent circuit model and its high-precision simplified parameter extraction algorithm is proposed by taking into account the intrinsic physical characteristics of the device,the electromagnetic characteristics of the pin and the parasitic characteristics of the test pad and test interconnects,which are used to describe the bias dependence from the strong inversion and weak inversion regimes.Therefore,the device characterizations offer excellent accuracy,continuity and smoothness under different bias condition,and can be easily implanted into commercial EDA tools.Direct extraction method is performed by S-parameter analysis including the intrinsic and the extrinsic components and the substrate-related effect.Finally,the practicability and the accuracy of the proposed model and its parameters extract algorithm are verified by the consistency comparison of the simulated results by using ADS2013 tool and the measured S parameters.The experimental results show the bias dependence of 45nm MOSFET.