EL4451C
Wideband Variable-Gain Amplifier Gain of 2
Applications Information Contd
A voltage-controlled equalizer and cable driver
can be constructed so
Equalization and Line Driver Amplifier
The main signal path is via the REF pin This
ensures maximum signal linearity while the mul-
tiplier input is used to allow a variable amount of
frequency-shaped input from R1 R2 and C For
optimum linearity the multiplier input is attenu-
ated by R1 and R2 This may not be necessary
depending on input signal amplitude and R1
might be set to 0 R1and R2 should be set to pro-
vide sufficient peaking depending on cable high-
frequency losses at maximum gain RF and RG
are chosen to provide the desired circuit gain in-
cluding backmatch resistor loss
4451 – 35
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