User`s guide

PSpice A/D-Equivalent Parts 6
-39
.001 (-60 dB) for frequencies above 6 kilohertz. The output is a
voltage across the output pins.
This part is defined by the following attributes:
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.
The constant group delay is calculated from the values for a
given table entry as follows:
group delay = phase / 360 / frequency
For this example, the group delay is 3.2 msec
(6912 / 360 / 6k = 5760 / 360 / 6k = 3.2m). An alternative
specification for this table could be:
TABLE = (0, 0, 0) (5kHz, 0, 0) (6kHz, -60, 0)
DELAY = 3.2ms
R_I =
MAGUNITS =
PHASEUNITS =
This produces a PSpice A/D netlist declaration like this:
ELOWPASS 5 0 FREQ {V(10)} = (0,0,0) (5kHz,0,0) (6kHz-60,0)
+ DELAY = 3.2ms