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| 型號： | THS4031DGN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| 中文描述： | 100 MHz的低噪聲高速放大器 |
| 文件頁數(shù)： | 21/38頁 |
| 文件大?。?/td> | 674K |
| 代理商： | THS4031DGN |
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THS4031, THS4032
100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
SLOS224C – JULY 1999 – REVISED APRIL 2000
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure (continued)
_
+
RF
RS
RG
eRg
eRf
eRs
en
IN+
Noiseless
IN–
eni
eno
Figure 44. Noise Model
The total equivalent input noise density (e
ni
) is calculated by using the following equation:
eni
en
2
IN
RS
2
IN–
RF
RG
2
4 kTRs
4 kT RF
RG
Where:
k = Boltzmann’s constant = 1.380658
×
10
–23
T = Temperature in degrees Kelvin (273 +
°
C)
R
F
|| R
G
= Parallel resistance of R
F
and R
G
To get the equivalent output noise of the amplifier, just multiply the equivalent input noise density (e
ni
) by the
overall amplifier gain (A
V
).
eno
eniAV
e
ni
1
R
F
R
G
(Noninverting Case)
As the previous equations show, to keep noise at a minimum, small-value resistors should be used. As the
closed-loop gain is increased (by reducing R
G
), the input noise is reduced considerably because of the parallel
resistance term. This leads to the general conclusion that the most dominant noise sources are the source
resistor (R
S
) and the internal amplifier noise voltage (e
n
). Because noise is summed in a root-mean-squares
method, noise sources smaller than 25% of the largest noise source can be effectively ignored. This advantage
can greatly simplify the formula and make noise calculations much easier to calculate.
For more information on noise analysis, please refer to the Noise Analysissection in Operational Amplifier
Circuits Applications Report(literature number SLVA043).
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PDF描述 |
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| THS4031EVM | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031FK | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031MFK | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4032D | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4032DGN | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS4031-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031EVM | 功能描述:放大器 IC 開發(fā)工具 THS4031 Hi-Spd Amp Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS4031FK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031ID | 功能描述:高速運算放大器 100MHz Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4031IDG4 | 功能描述:高速運算放大器 100-MHz Low Noise Volt-Feedback Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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