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PSpice User Guide Analog behavioral modeling October 2019 333 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. ■ Johnson, David E., Introduction to Filter Theory, Prentice-Hall, 1976. ■ Lindquist, Claude S., Active Network Design with Signal Filtering Applications, Steward & Sons, 1977. ■ Stephenson, F.W. (ed), RC Active Filter Design Handbook, Wiley, 1985. ■ Van Valkenburg, M.E., Analog Filter Design, Holt, Rinehart & Winston, 1982. ■ Williams, A.B., Electronic Filter Design Handbook, McGraw-Hill, 1981. Each of the Chebyshev filter parts is described in the following pages. LOPASS The LOPASS part is characterized by two cutoff frequencies that delineate the boundaries of the filter pass band and stop band. The attenuation values, RIPPLE and STOP, define the maximum allowable attenuation in the pass band, and the minimum required attenuation in the stop band, respectively. The LOPASS part provides one input and one output. Figure 6-1 shows an example of a LOPASS filter device. The filter provides a pass band cutoff of 800 Hz and a stop band cutoff of 1.2 kHz. The pass band ripple is 0.1 dB and the minimum stop band attenuation is 50 dB. FS stop band frequency FP pass band frequency RIPPLE pass band ripple in dB STOP stop band attenuation in dB