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參數(shù)資料
| 型號： | TS615 |
| 廠商： | 意法半導體 |
| 英文描述： | DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT |
| 中文描述： | 雙寬帶運放的大輸出電流 |
| 文件頁數(shù)： | 21/27頁 |
| 文件大?。?/td> | 982K |
| 代理商： | TS615 |
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TS615
21/27
NOISE MEASUREMENT
Figure 62 :
Noise Model
eN : input voltage noise of the amplifier
iNn : negative input current noise of the amplifier
iNp : positive input current noise of the amplifier
The closed loop gain is :
The six noise sources are :
V
2
=
Assuming the thermal noise of a resistance R as:
4kTR F
with
F the specified bandwidth.
On 1Hz bandwidth the thermal noise is reduced to
4kTR
k is the Boltzmann’s constant equals to
1,374.10-23J/°K. T is the temperature (°K).
The output noise eNo is calculated using the Su-
perposition Theorem. But it is not the sum of all
noise sources. The output noise is the square root
of the sum of the square of each noise source.
V12
+
+
=
eNo
2
The input noise of the instrumentation must be ex-
tracted from the measured noise value. The real
output noise value of the driver is:
The input noise is called the Equivalent Input
Noise as it is not directly measured but it is evalu-
ated from the measurement of the output divided
by the closed loop gain (eNo/g).
After simplification of the fourth and the fifth term
of (eq2) we obtain:
eNo
2
+
×
=
Measurement of eN:
We assume a short-circuit on the non-inverting in-
put (R3=0). (eq4) comes:
In order to easily extract the value of eN, the resis-
tance R2 will be chosen as low as possible. In the
other hand, the gain must be large enough.
R1=10
,
R2=910
,
R3=0, Gain=92
Equivalent Input Noise: 2.57nV/
√
Hz
Input Voltage Noise: eN=2.5nV/
√
Hz
Measurement of iNn:
R3=0 and the output noise equation is still the
(eq5). This time the gain must be decreased to de-
crease the thermal noise contribution.
R1=100
,
R2=910
,
R3=0, Gain=10.1
Equivalent Input Noise: 3.40nV/
√
Hz
Negative Input Current Noise: iNn =21pA/
√
Hz
Measurement of iNp:
To extract iNp from (eq3), a resistance R3 is con-
nected to the non-inverting input. The value of R3
must be chosen in order to keep its thermal noise
contribution as low as possible against the iNp
contribution.
R1=100
,
R2=910
,
R3=100
,
Gain=10.1
Equivalent Input Noise: 3.93nV/
√
Hz
Positive Input Current Noise: iNp=15pA/
√
Hz
Conditions: frequency=100kHz, V
=±2.5V
Instrumentation: Spectrum Analyzer HP3585A
(input noise of the HP3585A: 8nV/
√
Hz)
+
_
R3
R1
output
R2
iN-
iN+
8nV/
√
Hz
N1
N2
N3
TS615
eN
HP3577
Input noise:
AV
g
1
Rg
+
=
=
V
1
eN
1
2
R
1
------
+
2
R
1
×
=
iNn
R
2
×
V
3
iNp
R
3
1
------
+
×
×
=
V
4
2
R
1
------
4
kTR
1
×
–
=
V
5
4
kTR
2
=
V
6
1
2
R
1
------
+
4
kTR
3
=
eNo
V22
V32
V42
V52
V62
+
+
+
eq1
(
)
,
eN
2
g
2
iNn
2
R
22
iNp
2
2
+
×
+
×
R
32
×
g
2
×
=
…
2
R
1
------
2
4
kTR
1
4
kTR
2
1
2
R
1
------
+
4
kTR
3
×
+
+
×
eq
2
(
)
,
+
eNo
Measured
(
)
2
instrumentation
(
)
2
–
eq3
(
)
,
=
eN
2
g
2
iNn
2
R
22
2
iNp
2
+
×
R
32
×
g
2
×
…
g
4
kTR
2
1
2
R
1
------
+
4
kTR
3
×
+
×
eq
4
(
)
,
+
eNo
eN
2
g
2
iNn
2
R
22
g
4
kTR
2
×
+
×
+
×
eq
5
(
)
,
=
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