User`s guide

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))}

ure 6-10

ABM Expression

Part Example 2