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| 型號： | THS4042CDR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
| 中文描述： | 165兆赫的C -穩(wěn)定高速放大器 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 479K |
| 代理商： | THS4042CDR |
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THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
14
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 63. 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 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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| THS4042CDRG4 | 165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
| THS4042IDR | 165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
| THS4042IDRG4 | 165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
| THS4041D | 165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
| THS4041DGN | 165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| THS4042CDRG4 | 功能描述:高速運算放大器 165-MHz C-Stable Volt-Fdback Amp Dual 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4042D | 制造商:TI 制造商全稱:Texas Instruments 功能描述:165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
| THS4042DGN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:165-MHz C-STABLE HIGH-SPEED AMPLIFIERS |
| THS4042EVM | 功能描述:放大器 IC 開發(fā)工具 THS4042 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 |
| THS4042ID | 功能描述:高速運算放大器 Dual 165MHz 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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