EL4083CS INTERSIL [Intersil Corporation], EL4083CS Datasheet - Page 11

• Manufacturer Part Number: EL4083CS
• Description: Current Mode Four Quadrant Multiplier
• Manufacturer: INTERSIL [Intersil Corporation]

Other Applications
Elantec has also published an applications note covering
other applications of the EL4083. These include dividers,
squaring and square rooting circuits, several RMS and
power measurement circuits, and a wideband AGC circuit.
Also presented are two polynomial computation examples
for video and some HDTV quality fader and summing
circuits. The EL4083 has been found flexible enough to
easily implement all of the classic four quadrant multiplier
applications and also offer interesting new applications
possibilities.
EL4083 Macromodel
This macromodel is compatible with PSPICE (copywritten by
Microsim Corporation). It has been designed to work
accurately for fixed values of I
to 1.6mA. The additional simulation burden imposed by
including provision for a time varying I
worthwhile. The value of I
parameter NS. The relation between I
I
signals.
The model will provide good transient and frequency
response and settling time estimates as well as time domain
switching results. Input and output impedance and overload
responses are correctly modeled. The D.C. current drawn
from supplies for a given value of I
Noise, PSRR and the temperature dependence of A.C.
parameters such as frequency response and settling time
Z
= 200µA×NS. All other inputs can accept time varying
I
R
R
*Optimized for Wide Bandwidth
Z
X
Y
= V
= V
= V
CC
X
Y
/R
(MAX) / (1.25 × I
(MAX) / (1.25 × I
Z
Z
Z
)
)
Z
FIGURE 19. BASIC SCHEMATIC (SINGLE ENDED CONVERTED)-(150MHZ VCA)
is specified to the model by the
11
Z
(bias) in the range of 200µA
Z
is also correct.
Z
Z
and NS is;
was thought not
EL4083
are not modeled. Linearity and distortion results from the
model will be worse than the real part by about a factor of
three and do not show the correct frequency dependence.
The macromodel is constructed from simple controlled
sources, passive components and stripped transistor and
diode models. As such it should be usable, perhaps with
slight modification, on all but student or demonstration
simulators where the model’s size may be a problem.