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EL4452CS датащи(PDF) 10 Page - Elantec Semiconductor

номер детали EL4452CS
подробное описание детали  Wideband Variable-Gain Amplifier with Gain of 10
PDF  12 Pages
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производитель  ELANTEC [Elantec Semiconductor]
домашняя страница  http://www.elantec.com
Logo ELANTEC - Elantec Semiconductor

EL4452CS датащи(HTML) 10 Page - Elantec Semiconductor

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EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Applications Information
Contd
Most AGC’s deal with repetitive input signals
that are capacitively coupled It is generally de-
sirable to keep DC offsets from mixing with AC
signals and fooling the level detector into main-
taining the DC output offset level constant rath-
er than a smaller AC component To that end
either the level detector is AC-coupled or the ref-
erence voltage must be made greater than the
maximum multiplier gain times the input offset
For instance if the level detector output equaled
the reference voltage at 1V of EL4452 output the
8 mV of input offset would require a maximum
gain of 125 through the EL4452 Bias current-in-
duced offsets could increase this further
Depending on the nature of the signal different
level detector strategies will be employed If the
system goal is to prevent overload of subsequent
stages peak detectors are preferred Other strate-
gies use an RMS detector to maintain constant
output power Here is a simple AGC using peak
detection
4452 – 25
10



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