Programming instructions

Opamp
 National Instruments Corporation 5-7 Multisim Component Reference Guide
The interstage provides the DM and CM gains and consists of voltage-controlled current
sources
g
cm
,
g
a
and g
b
and resistors, R
02
and R
2
.
The dominant time constant of the opamp is
provided by the internal feed-back capacitor,
c
c
.
In some opamps, the two nodes of c
c
are made
available to the outside world for external compensation. The output stage models DC and AC
output resistance. The elements
d3, vc, d4 and ve provide maximum desired voltage swings.
Elements
d1, d2, rcc and gc provide the current-limiting function.
Interstage:
II
V
C
C
SS
OS
C
21
0.025
1
1
2
=+






= tan ∆
ϕ
g
I
RR
g
g
R
g
AR
eR
G
G
C
m
C
C
m
a
C
b
C
cm
a
MRR
=
=−






=
=
=
+
++
0 02585
1
1
100
1
12
122
1
1
3
02
.
e
β
ββ
β
ComponentRef.book Page 7 Thursday, December 7, 2006 10:12 AM