Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice User Guide Analog behavioral modeling October 2019 366 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. convolution of the past values of EXPR with the impulse response of the frequency response. These rules follow the standard method of using Fourier transforms. We recommend looking at one or more of the references cited in Frequency-domain device models on page 362 for more information. Note: The table's frequencies must be in order from lowest to highest. Figure 6-19 shows an EFREQ device used as a low pass filter. Figure 6-19 EFREQ part example. The input to the frequency response is the voltage across the input pins. The table describes a low pass filter with a response of 1 (0 dB) for frequencies below 5 kilohertz and a response of .001 (-60 dB) for frequencies above 6 kilohertz. The output is a voltage across the output pins. This part is defined by the following properties: TABLE = (0, 0, 0) (5kHz, 0, -5760) (6kHz, -60, -6912) DELAY = R_I = MAGUNITS = PHASEUNITS = Since R_I, MAGUNITS, and PHASEUNITS are undefined, each table entry is interpreted as containing frequency, magnitude value in dB, and phase values in degrees. Delay defaults to 0. The phase lags linearly with frequency meaning that this table exhibits a constant time (group) delay. The delay is necessary so that the impulse response is causal. That is, so that the impulse response does not have any significant components before time zero.