EL4450C
Wideband Four-Quadrant Multiplier
Figure 4. Absolute-Value Input Circuitry
An ECL comparator produces an output corresponding
to the sign of the input, which when multiplied by the
input produces an effective
absolute-value function. The RC product connected to
the X inputs simply emulates the time delay of the com-
parator to maintain circuit accuracy at higher
frequencies.
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