參數(shù)資料
型號(hào)： THS6007IPWP
廠商： Texas Instruments, Inc.
英文描述： DUAL DIFFERENTIAL LINE DRIVERS AND LOW-POWER RECEIVERS
中文描述： 雙差分線路驅(qū)動(dòng)器和低功耗接收機(jī)
文件頁(yè)數(shù)： 26/36頁(yè)
文件大?。?/td> 679K
代理商： THS6007IPWP
THS6007
DUAL DIFFERENTIAL LINE DRIVERS AND LOW-POWER RECEIVERS
SLOS334– DECEMBER 2000
26
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 receiver amplifiers which are
generally used for amplifying small signals coming over a transmission line. 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 82.
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 82. 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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