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| 型號： | THS3202DRG4 |
| 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, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 11/36頁 |
| 文件大?。?/td> | 1118K |
| 代理商： | THS3202DRG4 |
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_
+
Rf
RS
Rg
eRg
eRf
eRs
en
IN+
Noiseless
IN
eni
eno
where:
k = Boltzmann’s constant = 1.380658
× 1023
T = Temperature in degrees Kelvin (273 +
°C)
Rf || Rg = Parallel resistance of Rf and Rg
e
ni +
en
2
) IN )
R
S
2
) IN *
R
f
Rg
2
) 4 kTRs ) 4 kT Rf Rg
eno + eni AV + eni 1 )
R
f
Rg
(Noninverting Case)
www.ti.com
SLOS242F – SEPTEMBER 2002 – REVISED JANUARY 2010
NOISE CALCULATIONS
Noise can cause errors on very 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 78. This model includes all of the noise sources as follows:
en = Amplifier internal voltage noise (nV/√Hz)
IN+ = Noninverting current noise (pA/
√Hz)
IN
= Inverting current noise (pA/√Hz)
eRx = Thermal voltage noise associated with each resistor (eRx = 4 kTRx )
Figure 78. 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, 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 RF and 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.
Copyright 2002–2010, Texas Instruments Incorporated
19
Product Folder Link(s): THS3202
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