參數(shù)資料
型號(hào)： LOG114AIRGVRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 模擬運(yùn)算功能
英文描述： LOG OR ANTILOG AMPLIFIER, PQCC16
封裝： 4 X 4 MM, GREEN, PLASTIC, QFN-16
文件頁(yè)數(shù)： 13/29頁(yè)
文件大?。?/td> 637K
代理商： LOG114AIRGVRG4
LOG114
SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
20
ERBIUM-DOPED FIBER OPTIC AMPLIFIER
(EDFA)
The LOG114 was designed for optical networking sys-
tems. Figure 13 shows a block diagram of the LOG114
in a typical EDFA application. This application uses two
log amps to measure the optical input and output power
of the amplifier. A difference amplifier subtracts the log
output signals of both log amps and applies an error
voltage to the proportional-integral-derivative (PID)
controller. The controller output adjusts a voltage-con-
trolled current source (VCCS), which then drives the pow-
er op amp and pump laser. The desired optical gain is
achieved when the error voltage at the PID is zero.
The log ratio function is the optical power gain of the
EDFA. This circuitry forms an automatic power level
control loop.
An alternate design of the system shown in Figure 13
is possible because the LOG114 inherently takes the
log ratio. Therefore, one log amp can be eliminated by
connecting one of the photodiodes to the LOG114 I1
input, and the other to the I2 input. The differential
amplifier would then be eliminated.
The LOG114 is uniquely suited for most EDFA
applications because of its fast rise and fall times
(typically less than 1
s for a 100:1 current input step).
It also measures a very wide dynamic range of up to
eight decades.
V
CCS
Pump Laser
Power
Op Amp
Fiber
V
ERROR
V
OUT2
R
REF2
R
REF1
I
REF1
I
REF2
I
2
I
1
V
OUT1
PID
Diff
REF
DAC
I
L
Tap
OPA569
LOG114
1%
Tap
1%
Figure 13. Erbium-Doped Fiber Optic Amplifier (EDFA) block diagram.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LOG114AIRGVT 功能描述:對(duì)數(shù)放大器 Precision High-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
LOG114AIRGVTG4 功能描述:對(duì)數(shù)放大器 Prec High-Speed Logarithmic Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
LOG114EVM 功能描述:放大器 IC 開(kāi)發(fā)工具 LOG114 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
LOG1527 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:由CMOS工藝設(shè)計(jì)制造的可內(nèi)燒的學(xué)習(xí)碼編碼IC.
LOG2112 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LOGARITHMIC AND LOG RATIO AMPLIFIERS
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