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| 型号： | LOG114AIRGVR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟运算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, PQCC16 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 13/29页 |
| 文件大小： | 637K |
| 代理商： | LOG114AIRGVR |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LOG114AIRGVRG4 | 功能描述:对数放大器 Prec High-Speed Logarithmic Amp RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| LOG114AIRGVT | 功能描述:对数放大器 Precision High-Speed RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| LOG114AIRGVTG4 | 功能描述:对数放大器 Prec High-Speed Logarithmic Amp RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| LOG114EVM | 功能描述:放大器 IC 开发工具 LOG114 Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| LOG1527 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:由CMOS工艺设计制造的可内烧的学习码编码IC. |
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