Stepping toward standard methods of small-signal parameter extraction for HBTs
Stepping toward standard methods of small-signal parameter extraction for HBTs
复制标题
DOI：
10.1109/16.842955
复制
发表时间：
2000-06
影响因子：
3.1
通讯作者：
M. Sotoodeh;Lucia Sozzi;Alessandro Vinay;A. H. Khalid;Zhirun Hu;A. Rezazadeh;Roberto Menozzi
中科院分区：
文献类型：
--
作者：
M. Sotoodeh;Lucia Sozzi;Alessandro Vinay;A. H. Khalid;Zhirun Hu;A. Rezazadeh;Roberto Menozzi
提出了一种改进的HBT小信号参数提取方法，该方法不需要进行数值优化，而是通过解析方法提取等效电路元件。近似所需的简化公式中使用的提取程序进行了修订，它表明，本方法具有广泛的适用性，这使得它适合GaAs和InP基的单双HBT。此外，开发了一种新的方法来提取HBT在低频下的总延迟时间，而不需要在非常高的频率下测量h/sub 21/和/或用-20 dB/dec滚降对其进行外推。对现有的前向渡越时间计算方法进行了改进，提高了该参数及其分量的精度。本技术的参数提取和延迟时间分析应用于InGaP/GaAs DHBT和它示出：（1）所有提取的参数的变化是物理上合理的;（2）之间的协议的测量和模拟的S-和Z-参数在整个频率范围内是优秀的;和（3）分析提取程序后的优化步骤是没有必要的。因此，我们相信，本技术可用作适用于各种类型的HBT的标准提取程序。
An improved HBT small-signal parameter extraction procedure is presented in which all the equivalent circuit elements are extracted analytically without reference to numerical optimization. Approximations required for simplified formulae used in the extraction routine are revised, and it is shown that the present method has a wide range of applicability, which makes it appropriate for GaAs and InP-based single and double HBTs. Additionally, a new method is developed to extract the total delay time of HBTs at low frequencies, without the need to measure h/sub 21/ at very high frequencies and/or extrapolate it with -20 dB/dec roll-off. The existing methods of finding the forward transit time are also modified to improve the accuracy of this parameter and its components. The present technique of parameter extraction and delay time analysis is applied to an InGaP/GaAs DHBT and it is shown that: (1) variations of all the extracted parameters are physically justifiable; (2) the agreement between the measured and simulated S- and Z-parameters in the entire range of frequency is excellent; and (3) an optimization step following the analytical extraction procedure is not necessary. Therefore, we believe that the present technique can be used as a standard extraction routine applicable to various types of HBTs.