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參數(shù)資料
| 型號： | THS3002IDGN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS |
| 中文描述： | 420 - MHz高速電流反饋放大器 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 633K |
| 代理商： | THS3002IDGN |
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THS3001, THS3002
420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
SLOS217A – JULY 1998 – REVISED JUNE 1999
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure
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 49. This model includes all of the noise sources as follows:
e
n
= amplifier internal voltage noise (nV/
√
Hz)
IN+ = noninverting current noise (pA/
√
Hz)
IN– = inverting current noise (pA/
√
Hz)
e
Rx
= thermal voltage noise associated with each resistor (e
Rx
= 4 kTR
x
)
_
+
RF
RS
RG
eRg
eRf
eRs
en
IN+
Noiseless
IN–
eni
eno
Figure 49. 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)
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