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TS616IDWT データシート(PDF) 24 Page - STMicroelectronics

部品番号 TS616IDWT
部品情報  Dual wide band operational amplifier with high output current
PDF  37 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS616IDWT データシート(HTML) 24 Page - STMicroelectronics

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Noise measurements
TS616
24/37
The output noise eNo is calculated using the Superposition Theorem. However eNo is not
the sum of all noise sources, but rather the square root of the sum of the square of each
noise source, as shown in Equation 1.
Equation 1
Equation 2
The input noise of the instrumentation must be extracted from the measured noise value.
The real output noise value of the driver is:
Equation 3
The input noise is called the Equivalent Input Noise as it is not directly measured but is
evaluated from the measurement of the output divided by the closed loop gain (eNo/g).
After simplification of the fourth and the fifth term of Equation 2 we obtain:
Equation 4
7.1
Measurement of eN
If we assume a short-circuit on the non-inverting input (R3=0), Equation 4 becomes:
Equation 5
In order to easily extract the value of eN, the resistance R2 will be chosen as low as
possible. On the other hand, the gain must be large enough:
●
R1=10
Ω, R2=910 Ω, R3=0, Gain=92
●
Equivalent input noise: 2.57 nV/
√Hz
●
Input voltage noise: eN=2.5 nV/
√Hz
NoV1
2
V2
2
V3
2
V4
2
V5
2
V6
2
+++
++
=
No
2
eN
2
g
2
iNn
2
R2
2
iNp
2
+
×
+
×
R3
2
×
g
2
×
=
…
R2
R1
--------
⎝⎠
⎛⎞
2
4kTR1
4kTR2
1
R2
R1
--------
+
⎝⎠
⎛⎞
2
4kTR3
×
++
×
+
eNo
Measured
()
2
instrumentation
()
2
–
=
eN
2
g
2
iNn
2
R2
2
iNp
2
+
×
+
×
R3
2
×
g
2
×… g4kTR2
1
R2
R1
--------
+
⎝⎠
⎛⎞
2
4kT
×
+
×
+
=
NoeN
2
g
2
iNn
2
R2
2
g4kTR2
×
+
×
+
×
=



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