參數(shù)資料
型號： THS3001HVCDGNR
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
文件頁數(shù)： 13/36頁
文件大?。?/td> 718K
代理商： THS3001HVCDGNR
_
+
RF
RS
RG
eRg
eRf
eRs
en
IN+
Noiseless
IN
eni
eno
e
ni +
en
2
) IN )
R
S
2
) IN–
R
F
R
G
2
) 4 kTRs ) 4 kT RF RG
Where:
k = Boltzmann’s constant = 1.380658
× 1023
T = Temperature in degrees Kelvin (273 +
°C)
RF || RG = Parallel resistance of RF and RG
eno + eni AV + eni 1 )
R
F
R
G
(Noninverting Case)
SLOS217H – JULY 1998 – REVISED SEPTEMBER 2009................................................................................................................................................. www.ti.com
NOISE CALCULATIONS
Noise can cause errors on small signals. This is especially true for amplifying small signals coming over a
transmission line or an antenna. The noise model for current-feedback amplifiers (CFB) is the same as for
voltage feedback amplifiers (VFB). The only difference between the two is that CFB amplifiers generally specify
different current-noise parameters for each input, while VFB amplifiers usually only specify one noise-current
parameter. The noise model is shown in Figure 49. This model includes all of the noise sources as follows:
en = Amplifier internal voltage noise (nV/√Hz)
IN+ = Nonverting current noise (pA/
√Hz)
IN- = Inverting current noise (pA/
√Hz)
eRx = Thermal voltage noise associated with each resistor (eRx = 4 kTRx)
Figure 49. Noise Model
The total equivalent input noise density (eni) is calculated by using the following equation:
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.
20
Copyright 1998–2009, Texas Instruments Incorporated
Product Folder Link(s): THS3001
相關(guān)PDF資料
PDF描述
THS3001HVCDR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS3001HVCDGNRG4 功能描述:高速運算放大器 420 MHz Curr 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS3001HVCDRG4 制造商:Texas Instruments 功能描述:OP AMP SGL CURRENT FDBK 18.5V/37V 8SOIC - Tape and Reel
THS3001HVIDGN 功能描述:高速運算放大器 420-MHz Curr 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS3001HVIDGNG4 功能描述:高速運算放大器 420-MHz Curr 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS3001HVIDGNR 功能描述:高速運算放大器 420-MHz Curr 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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