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EL4083CN

Current Mode Four Quadrant Multiplier

Intersil 

EL4083

IZ = VCC/RZ

RX = VX (MAX) / (1.25 × IZ)

RY = VY (MAX) / (1.25 × IZ)

*Optimized for Wide Bandwidth

FIGURE 19. BASIC SCHEMATIC (SINGLE ENDED CONVERTED)-(150MHZ VCA)

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 IZ (bias) in the range of 200µA

to 1.6mA. The additional simulation burden imposed by

including provision for a time varying IZ was thought not

worthwhile. The value of IZ is specified to the model by the

parameter NS. The relation between IZ and NS is;

IZ = 200µA×NS. All other inputs can accept time varying

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 IZ is also correct.

Noise, PSRR and the temperature dependence of A.C.

parameters such as frequency response and settling time

11

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.

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