參數(shù)資料
型號(hào)： THS6032CGQE
廠商： Texas Instruments, Inc.
英文描述： LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
中文描述： 低功耗寬帶局端線路驅(qū)動(dòng)器
文件頁(yè)數(shù)： 24/31頁(yè)
文件大小： 496K
代理商： THS6032CGQE
THS6032
LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
SLOS233C – APRIL1999 – REVISED MARCH 2000
24
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 the amplifying small signals. The noise
model for current feedback amplifiers (CFB) is the same as voltage feedback amplifiers (VFB). The only
difference between the two is that the 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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