Programming instructions

Analog Components
Multisim Component Reference Guide 5-8 ni.com
Output stage:
5.1.3.3 Real Models
Models are supplied by various manufacturers of real-world opamps. Some are simple three-
or five-terminal models, while others have additional pins to support functions such as
external compensation and output offset balance controls.
Each model is unique as it was developed by the individual companies to support their
products. Therefore, a general description of each model is not possible.
5.2 Norton Opamp
The Norton amplifier, or the current-differencing amplifier (CDA) is a current-based device.
Its behavior is similar to an opamp, but it acts as a transresistance amplifier where the output
voltage is proportional to the input current.
IIgI
II
RI
R
i
I
I
G
R
VVV VI
I
I
VVV VI
I
I
xcbSC
SD x
SC
CC
x
x
SD
C
C
CCCSW n
SC
SD
EeeSW n
SC
SD
01
2
0 025
0 025
100
1
=−
=
=
=
=+∗
=+∗
−










−
−
+
−
*
exp
*
.
.
ln
Τ
Τ
ComponentRef.book Page 8 Thursday, December 7, 2006 10:12 AM