Wireless devices integrating more and more features in ever-smaller packages have become integral part of everyone’s daily life. These systems have seen a continuous push to profit from digital signal processing techniques, in which signals are no longer traditional continuous amplitude and/or phase-modulated carriers, but became pulsed waveforms where the amplitude and/or phase are coded in some on–off digital scheme. This on–off scenario has been addressing new challenges to the circuit-level simulation of such systems. Having this in mind this paper aims to propose an innovative time–frequency simulation technique based on a switch mode algorithm, which is specially conceived for the efficient numerical simulation of RF circuits whose stimuli are intermittently turned on and off for unknown periods of time. At present, to simulate this category of circuits commercial tools have no choice than to make use of full conventional SPICE algorithms. This paper suggests an alternative way, which can result in significant speedups, without perceptible loss in accuracy.

在越来越小的封装中集成了越来越多功能的无线设备已经成为每个人日常生活的组成部分。这些系统不断受益于数字信号处理技术，其中信号不再是传统的连续幅度和/或相位调制载波，而是成为脉冲波形，其中幅度和/或相位以某种开-关方式编码数字方案。这种通断方案一直在应对此类系统的电路级仿真的新挑战。考虑到这一点，本文旨在提出一种基于开关模式算法的创新时频仿真技术，该技术专为对在未知时间段内间歇性地打开和关闭激励的RF电路进行有效的数值仿真而构思。现在，要模拟此类电路，商用工具别无选择，只能使用完整的常规SPICE算法。本文提出了一种替代方法，该方法可以显着提高速度，而不会造成精度上的明显损失。