參數(shù)資料
型號(hào)： THS4021CIDGNR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： GREEN, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 2/28頁(yè)
文件大小： 948K
代理商： THS4021CIDGNR
www.ti.com
_
+
R
F
R
S
R
G
e
Rg
e
Rf
e
Rs
e
n
IN+
Noiseless
IN–
e
ni
e
no
S0277-01
e
ni +
en
2
) IN+
R
S
2
) IN
R
F
R
G
2
) 4 kTRs ) 4 kT RF RG
eno + eni AV + eni 1 )
R
F
R
G
(noninverting case)
NF
+ 10log
e
2
ni
e
Rs
2
SLOS265C – SEPTEMBER 1999 – REVISED JULY 2007
Figure 31. Noise Model
The total equivalent input noise density (eni) is calculated by using the following equation:
where:
k = Boltzmann’s constant = 1.380658
× 10–23
T = Temperature in degrees Kelvin (273 +
°C)
RF || RG = Parallel resistance of RF and RG
To get the equivalent output noise of the amplifier, just multiply the equivalent input noise density (eni) by the
overall amplifier gain (AV).
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 RG), 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 (RS) and the internal amplifier noise voltage (en). 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, see the Noise Analysis in Operational Amplifier Circuits application
report (SLVA043).
This brings up another noise measurement usually preferred in RF applications, the noise figure (NF). Noise
figure is a measure of noise degradation caused by the amplifier. The value of the source resistance must be
defined and is typically 50
in RF applications.
10
Copyright 1999–2007, Texas Instruments Incorporated
Product Folder Link(s): THS4021 THS4022
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4021D 制造商:TI 制造商全稱:Texas Instruments 功能描述:350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
THS4021DGN 制造商:TI 制造商全稱:Texas Instruments 功能描述:350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
THS4021EVM 功能描述:放大器 IC 開發(fā)工具 THS4021 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(píng)估:IR4302 工作電源電壓:13 V to 23 V
THS4021ID 功能描述:高速運(yùn)算放大器 350MHz RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)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
THS4021IDG4 功能描述:高速運(yùn)算放大器 Ultra-Low Noise Voltage-Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)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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