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从原理上讲,非线性模型方程及其有关参数值可以从器件加工工艺中的各种物理参数获得。另一方面,非线性特点也可以用经验公式来模拟。其中系数的确定(参数提取)可以利用优化技术,通过对测得的数据进行拟合完成。通常,在工程实践中,以上两种方法对于定量的非线性电路设计都是不够的。在此我们提出的方法是,测出器件特性参数,然后,从这些数据构造出分别用于直流、小信号以及大信号分析的非线性模型函数。所得的FET模型具有以下特点:(1)它具有极好的通用性;(2)与所采用的器件加工技术及工艺过程无关,因为这些计算过程对于任何器件都适用,只要该器件能用等效电路表示就行;(3)该模型十分具体、精确,这表现在计算中包括了各器件依赖于V_(GS)和V_(DS)特有的非线性;(4)该模型是非准静态的,因为它考虑了频率色散效应。根据比例换算原理,它可以模拟各种结构的器件。
In principle, the nonlinear model equations and their related parameter values can be obtained from various physical parameters in the device fabrication process. On the other hand, non-linear features can also be simulated using empirical formulas. The determination of the coefficients (parameter extraction) can be performed using optimization techniques by fitting the measured data. Generally, in engineering practice, the above two methods are not enough for quantitative nonlinear circuit design. The method we propose here is to measure the device characteristic parameters and then construct the nonlinear model functions from these data for DC, small signal and large signal analysis, respectively. The resulting FET model has the following characteristics: (1) it has excellent versatility; (2) has nothing to do with the device processing technology and process used, because these calculations apply to any device, as long as the device can be used (3) The model is very specific and accurate, which includes that each device depends on the unique nonlinearities of V GS and V DS. (4) The model is non-quasi-static, Because it considers the frequency dispersion effect. According to the principle of scaling, it can simulate a variety of devices.