Programming instructions

Basic Components
Multisim Component Reference Guide 2-24 ni.com
For trapezoid method:
For Gear method (first order):
where:
V
n+1
= present unknown voltage across the inductor
i
n+1
= present unknown current through the inductor
V
n
, i
n
= previous solution values
h = time step
n = time interval
These expressions are derived by applying appropriate numerical integration to the
characteristic equation of the inductor.
2.8.4 AC Frequency Model
For the small-signal analysis, the inductor is modeled by an impedance with its imaginary
component equal to 2
π fL,
where:
f = frequency of operation of the circuit
L = inductance value
R
L
h
i
h
L
Vi
Ln
Ln n n
=
=+
2
2
R
L
h
i
h
L
V
Ln
Ln n
=
=
ComponentRef.book Page 24 Thursday, December 7, 2006 10:12 AM