标题： 理解长期记忆模型参数在功率放大器稳定性分析的零极点识别中的影响 显示英文标题

标题： Understanding the Effect of Long-Term Memory Model Parameters in Pole-Zero Identification for Stability Analysis of Power Amplifiers

摘要： 理解潜在不稳定性本性对于功率放大器的稳定至关重要。 极点-零点识别是可用于确定大信号操作下设计稳定性的一种技术。 本文介绍了与晶体管模型（自加热和陷阱）长期记忆参数相关的基频处可能存在极点，并进行了讨论。 文章展示了它们对基频附近识别出的频率响应的影响可能会影响稳定性分析结果和稳定性裕度评估。 基频处极点的低可观测性突显了在低频带准确识别真实极点的重要性。 本文提出了一种用于非共振频率响应自动频域识别的具体算法以及检测和减少真实极点过拟合的程序。 通过两种不同放大器设计的蒙特卡罗灵敏度分析，证明了所提出方法论正确检测和分析低频真实极点的好处。 显示英文摘要

摘要： Understanding the nature of potential instabilities is indispensable for the stabilization of power amplifiers. Pole-zero identification is one of the techniques that can be used to determine the stability of a design in large-signal operation. In this work, the possible presence of poles at the fundamental frequency linked to the long-term memory parameters of the transistor's model (self-heating and traps) is presented and discussed. The paper shows how their effect on the identified frequency responses around the fundamental frequency may compromise the stability analysis results and the assessment of stability margins. The low observability of the poles at the fundamental frequency highlights the importance of an accurate identification of real poles in low-frequency bands. A specific algorithm for the automatic frequency domain identification of non-resonant frequency responses and a procedure for detecting and reducing overfitting of real poles is proposed in this article. The benefits of the proposed methodology to correctly detect and analyze real poles at low frequencies is demonstrated through Monte-Carlo sensitivity analyses of two different amplifier designs.