![]() The benefits of this frequency-shaping flexibility are especially apparent in performance comparisons of the ADSpice model closed loop pulse response and stability analysis, versus that of a more simplistic model. Most importantly, the high frequency gain and phase response can be precisely tailored to match a real amplifier's response. The stages shown reflect no particular op amp, but example principles can be found within the OP27 model (see Reference 10).īecause all of these frequency-shaping stages are dc-coupled and have unity gain, any number of them can be added or deleted, with no affect on the model's low frequency response. In all instances, it is assumed that each stage provides zero loading to the driving stage. Early ADSpice models used relatively high values, while later ones employ lower values to reduce noise (described in more detail later). Because an infinite number of values are possible in SPICE, choice of RC values is somewhat arbitrary, and a wide range work. The pole or zero frequency is set by the combination of the resistor(s) and capacitor, or resistor(s) and inductor, as may be the case. The frequency-shaping stages possible within the ADSpice model ![]()
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