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The electromagnetic immunity of an operational amplifier in the non-inverting configuration is characterized using the direct power injection (DPI) standard. The amplifier is driven by the functional input signal and the radio-frequency (RF) disturbance signal that is injected into the output pin. The output reflection coefficient in the large-signal conditions is calculated from the time-domain simulations...
An algorithm for sampling the time-domain behaviour of circuits for building nonlinear black-box models is presented. The two-dimensional modelling domain (frequency, forward power level), for which the time-domain behaviour of a circuit is modelled, is sampled adaptively to achieve two goals: (i) apply more focus on the nonlinear regions, (ii) avoid undersampling of the linear regions. The proposed...
This paper introduces a mixed domain event-driven modeling method for RF systems. The circuit behaviors are modeled in time/frequency domain adaptively combining with the equivalent baseband representation of each spectral component. Comparing to traditional baseband modeling methods or harmonic balance simulation techniques, this mixed domain method loose the requirements of relations among carrier...
A Shooting-Newton for steady-state simulation of Radio Frequency (RF) circuits is presented. The method is based on high order A- and L-stable Obreshkov formula (ObF), and thus allows for a considerable improvement in CPU cost compared to the Backward Euler based approach. As can be seen from the example a speedup of more than 8 can be achieved.
In order to investigate the distributed semiconductor device high frequency operation, we are developing a 2D/3D time-domain electromagnetic physical simulator. It is based on a self-consistent solution of both the Maxwell equations and the free carrier macroscopic conservation equation sets issued from the Boltzmann general transport equation. Its large potential application field presently concerns...
Simulating modern wireless communication systems is today a hot topic. Serious difficulties arise when these systems are composed of strongly nonlinear highly heterogeneous circuits operating in multiple time scales. In this sense, this paper provides a general overview on the existing time-domain simulation techniques, as the ones encountered in commercial packages, or the ones recently published...
According to the well-known Friis equation the available power gain should be maximized to reduce the overall noise figure. Therefore, in receivers where an LNA is not present or its gain is low, the available power gain of the passive mixer is of interest. However, only the voltage gain is presented in many papers. In this paper an analytical model is presented for the power gain, voltage gain and...
This paper presents an innovative time-domain simulation method, especially conceived for simulating strongly nonlinear RF circuits whose state variables are all fluctuating in a fast-varying time scale, but evidence different time evolution rates in a slow envelope time scale. The method uses the mathematical method of lines based on modern multirate Runge-Kutta (MRK) schemes, and operates within...
This paper focuses on behavioral modelling of passive RF blocks from frequency domain samples. This model has been implemented in Scilab/Scicos software which allows the resolution of implicit equations, therefore the implementation of bilateral behavioral models. This approach combines on one hand, the vectorfitting (VF) method which estimates the poles and residues of MIMO system, and the inverse...
With the advent of wireless transceiver reconfigurability, a need has been felt to take profit of digital signal processing tools, this way increasing RF circuits' complexity and heterogeneity. Having this objective in mind, this paper presents an analytical formulation and a novel numerical method for simulating, in a very efficient way, strongly nonlinear heterogeneous RF circuits running in three...
With the advent of wireless transceiver reconfigurability, a need has been felt to take profit of digital signal processing tools, this way increasing RF circuits' complexity and heterogeneity. Having this objective in mind, this paper presents an analytical formulation and a novel numerical method for simulating, in a very efficient way, strongly nonlinear heterogeneous RF circuits running in three...
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