Cooper LP800 Guia do Utilizador Página 217

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Control System Parts 6
-23
In this example of an ABM device, the output voltage is set to 5
volts times the square root of the voltage between net 3 and
net 2. The attribute settings for this part are as follows:
EXP1 = 5V *
EXP2 = SQRT(V(%IN2,%IN1))
This will produce a PSpice A/D netlist declaration like this:
ESQROOT 4 0 VALUE = {5V*SQRT(V(3,2))}
Example 2
GPSK is an oscillator for a PSK (Phase Shift Keyed) modulator.
Current is pumped from net 11 through the source to net 6. Its
value is a sine wave with an amplitude of 15 mA and a frequency
of 10 kHz. The voltage at net 3 can shift the phase of GPSK by
1 radian/volt. Note the use of the TIME parameter in the EXP2
expression. This is the PSpice A/D internal sweep variable used
in transient analyses. For any analysis other than transient,
TIME = 0. This could be represented with an ABM1/I part
(single input, current output) like the one shown in Figure 6-10.
This part is characterized by the following attributes:
EXP1 = 15ma * SIN(
EXP2 = 6.28*10kHz*TIME
EXP3 = + V(%IN))
This produces a PSpice A/D netlist declaration like this:
GPSK 11 6 VALUE = {15MA*SIN(6.28*10kHz*TIME+V(3))}
Fi
g
ure 6-10
ABM Expression
Part Example 2
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