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參數(shù)資料
| 型號： | EL4452C |
| 英文描述： | Wideband Variable-Gain Amplifier with Gain of 10 |
| 中文描述： | 寬帶可變增益與10增益放大器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 270K |
| 代理商： | EL4452C |
EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Applications Information
Contd
The output of the EL4452 drives a diode detector
which is compared to VREF by an offset integra-
tor Its output feeds the gain-control input of the
EL4452 The integrator’s output is attenuated by
the2k
X and 27 kX resistors to prevent the op-
amp from overloading the gain-control pin dur-
ing zero input conditions The 510 k
X resistor
provides a pull-down current to the peak level
storage capacitor C1 to allow it to drift negative
when output amplitude reduces Thus the detec-
tor is of fast attack and slow decay design able to
reduce AGC gain rapidly when signal amplitude
suddenly increases
and increases gain slowly
when the input drops out momentarily The val-
ue of C1 determines drop-out reaction rates and
the value of CF affects overall loop time constant
as well as the amount of ripple on the gain-con-
trol line C2 can be used to reduce this ripple fur-
ther although it contributes to loop overshoot
when input amplitude changes suddenly The op-
amp can be any inexpensive low-frequency type
The major problem with diode detectors is their
large and variable forward voltage They require
at leasta2VP-P peak output signal to function
reliably and the forward voltage should be com-
pensated by including a negative VD added to
VREF Even this is only moderately successful
At the expense of bandwidth op-amp circuits can
greatly improve diode rectifiers (see ‘‘An Im-
proved Peak Detector’’ an Elantec application
note) Fortunately the detector will see a con-
stant amplitude of signal if the AGC is operating
correctly
A better-calibrated method is to use a four-quad-
rant multiplier as a square-law detector Here is a
circuit employing the EL4450
4452 – 26
11
相關PDF資料 |
PDF描述 |
|---|---|
| EL4452CN | Wideband Variable-Gain Amplifier with Gain of 10 |
| EL4452CS | Wideband Variable-Gain Amplifier with Gain of 10 |
| EL4453 | Video Fader |
| EL4453C | Video Fader |
| EL4453CN | Video Fader |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EL4452CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Wideband Variable-Gain Amplifier with Gain of 10 |
| EL4452CS | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Wideband Variable-Gain Amplifier with Gain of 10 |
| EL4453 | 制造商:ELANTEC 制造商全稱:ELANTEC 功能描述:Video Fader |
| EL4453C | 制造商:ELANTEC 制造商全稱:ELANTEC 功能描述:Video Fader |
| EL4453CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Video Fader |
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