Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice User Guide Analog behavioral modeling October 2019 332 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. The SOFTLIMIT part provides a limiting function much like the LIMIT device, except that it uses a continuous curve limiting function, rather than a discontinuous limiting function. This part takes one input and provides one output. Caution Besides the limiters listed above, the ABM.OLB consists of a legacy part, HILO. This part is in the library for backward compatibility and should not be used in your designs. Chebyshev filters The Chebyshev filters allow filtering of the signal based on a set of frequency characteristics. The output of a Chebyshev filter depends upon the analysis being performed. Note: PSpice computes the impulse response of each Chebyshev filter used in a transient analysis during circuit read-in. This may require considerable computing time. A message is displayed on your screen indicating that the computation is in progress. For DC and bias point, the output is simply the DC response of the filter. For AC analysis, the output for each frequency is the filter response at that frequency. For transient analysis, the output is then the convolution of the past values of the input with the impulse response of the filter. These rules follow the standard method of using Fourier transforms. Note: To obtain a listing of the filter Laplace coefficients for each stage, choose Setup from the Analysis menu, click on Options, and enable LIST in the Options dialog box. We recommend looking at one or more of the references cited in Frequency-domain device models on page 362, as well as some of the following references on analog filter design: ■ Ghavsi, M.S. & Laker, K.R., Modern Filter Design, Prentice-Hall, 1981. ■ Gregorian, R. & Temes, G., Analog MOS Integrated Circuits, Wiley-Interscience, 1986.