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The frequency warping error occurring in transient circuit analysis and the manner to control it are revisited. A new algorithm for the time step choice, based on an energy balance error, is proposed. An example shows that this new algorithm rejects fewer time steps than the SPICE one.
A new error and a new time step choice algorithm are proposed. A comparison with the SPICE results is given for a linear circuit, showing that the proposed algorithm rejects a smaller number of time steps.
Consider a dynamic circuit containing nonlinear resistors, the other elements being linear. Each nonlinear resistor is replaced by a set of equivalent sources which are current or voltage dependent. The parameters of these sources are corrected iteratively. In order to find the new controlling voltages (currents) linear sinusoidal problems are solved for source harmonics. The convergence of this iterative...
A new method for the parameter identification of a behavioral model of a nonlinear BAW resonator is proposed. This model contains two parametric elements whose resistance and capacitance depend on the r.m.s. value of the input current. The identification procedure is simpler than that corresponding to the known physical models. The model of a quartz resonator is built and implemented in the APLAC...
New nonlinear circuits, modeling both the amplitude-frequency effect and the intermodulation effect are described. One model is validated using the measured dependence of the series resonance frequency on the incident power.
A critical description of the known models of power BAW resonators is presented. It is shown that behavioral models must be preferred to the physical ones and that linear parametric models cannot be implemented in commercial circuit analysis programs. New nonlinear circuits, modeling both the amplitude- frequency effect and the intermodulation effect are briefly decsribed.
The poor efficiency of the envelope following analysis with respect to the transient analysis is pointed out. The implementations in SPECTRE RF and PAN are taken into account. The reasons for this poor efficiency are shown together with some possible solutions for its improvement.
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