公开(公告)号：EP0855663A3

公开(公告)日：2001-01-24

申请号：EP98300404.5

申请日：1998-01-20

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Roychowdhury, Jaijeet

IPC: G06F17/50

CPC classification number: G06F17/5036

Abstract: Novel algorithms for computing the responses of circuits to multi-tone excitations. The new algorithms are efficient and robust for large, strongly nonlinear circuits excited by multi-tone (quasi-periodic or envelope-modulated) signals. Hence they are particularly useful for integrated RF applications. The multivariate representation captures features produced by strong nonlinearities (such as spikes or pulses) much more compactly than traditional frequency- or time-domain representations. The new algorithms compute these functions efficiently by solving a partial differential equation (PDE) in the time or mixed frequency-time domains. Frequency-domain spectra or time-domain waveforms are generated from the multivariate functions as cheap post-processing steps. Two methods, multivariate FDTD and hierarchical shooting, are purely time-domain techniques suitable for the general strongly nonlinear circuit problem. They differ in their memory and computation needs. A new mixed frequency-time method is more efficient for circuits that are moderately (but not strongly) nonlinear in one or more tones (e.g, switching mixers, switched-capacitor filters). The linear systems at the core of all three techniques are especially well suited for iterative solution. This is exploited in the methods to achieve linear growth of computation and memory with respect to circuit size. The mixed frequency-time method of this work avoids the ill-conditioning problem by computing with the slow harmonic components directly, rather than with time-domain samples at sets of points close to each other.

公开(公告)号：EP0855663B1

公开(公告)日：2012-05-09

申请号：EP98300404.5

申请日：1998-01-20

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Roychowdhury, Jaijeet

IPC: G06F17/50

CPC classification number: G06F17/5036

公开(公告)号：EP0855663A2

公开(公告)日：1998-07-29

申请号：EP98300404.5

申请日：1998-01-20

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Roychowdhury, Jaijeet

IPC: G06F17/50

CPC classification number: G06F17/5036

Abstract: Novel algorithms for computing the responses of circuits to multi-tone excitations. The new algorithms are efficient and robust for large, strongly nonlinear circuits excited by multi-tone (quasi-periodic or envelope-modulated) signals. Hence they are particularly useful for integrated RF applications. The multivariate representation captures features produced by strong nonlinearities (such as spikes or pulses) much more compactly than traditional frequency- or time-domain representations. The new algorithms compute these functions efficiently by solving a partial differential equation (PDE) in the time or mixed frequency-time domains. Frequency-domain spectra or time-domain waveforms are generated from the multivariate functions as cheap post-processing steps. Two methods, multivariate FDTD and hierarchical shooting, are purely time-domain techniques suitable for the general strongly nonlinear circuit problem. They differ in their memory and computation needs. A new mixed frequency-time method is more efficient for circuits that are moderately (but not strongly) nonlinear in one or more tones (e.g, switching mixers, switched-capacitor filters). The linear systems at the core of all three techniques are especially well suited for iterative solution. This is exploited in the methods to achieve linear growth of computation and memory with respect to circuit size. The mixed frequency-time method of this work avoids the ill-conditioning problem by computing with the slow harmonic components directly, rather than with time-domain samples at sets of points close to each other.

Abstract translation: 用于计算电路对多音调激励的响应的新算法。 新的算法对于由多音调（准周期或包络调制）信号激发的大的强非线性电路是有效和鲁棒的。 因此，它们对集成RF应用特别有用。 多变量表示捕获由强非线性（如尖峰或脉冲）产生的特征比传统的频域或时域表示更紧凑。 新算法通过在时间或混合频域中求解偏微分方程（PDE）来有效地计算这些函数。 频域光谱或时域波形从多变量函数生成为便宜的后处理步骤。 多变量FDTD和分层拍摄的两种方法纯粹是适用于一般强非线性电路问题的时域技术。 他们的记忆和计算需求不同。 对于在一个或多个音调（例如开关混频器，开关电容滤波器）中的中等（但不强）非线性的电路，新的混合频率 - 时间方法更有效。 所有三种技术核心的线性系统特别适用于迭代解决方案。 这在方法中被利用来实现关于电路尺寸的计算和存储器的线性增长。 这种工作的混合频率方法通过直接用慢谐波分量计算避免了病态调节问题，而不是在彼此靠近的点集合处的时域样本。