Cooper LP800 Guia do Utilizador descarregar pdf (Página 233)

100

101

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

1 2 ... 228 229 230 231 232 233 234 235 236 237 238 ... 566 567

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Cooper LP800 Guia do Utilizador Página 233

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