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| OPA140 Datasheet, PDF (18/44 Pages) Texas Instruments – 11-MHz JFET Op Amp | |||
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OPA140, OPA2140, OPA4140
SBOS498B â JULY 2010 â REVISED NOVEMBER 2015
Feature Description (continued)
A) Noise in Noninverting Gain Configuration
R2
R1
EO
RS
VS
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Noise at the output:
EO2 =
1+
R2
R1
2
en2 +
2
2
R2
R1
e12 + e22 +
1+
R2
R1
es2
Where eS =
e1 =
e2 =
4kTRS = thermal noise of RS
4kTR1 = thermal noise of R1
4kTR2 = thermal noise of R2
B) Noise in Inverting Gain Configuration
R2
R1
Noise at the output:
2
EO2 =
1 + R2
R1 + RS
en2 +
R2
R1 + RS
2
e12 + e22 +
R2
R1 + RS
2
es2
RS
EO
VS
Where eS = 4kTRS = thermal noise of RS
e1 = 4kTR1 = thermal noise of R1
e2 = 4kTR2 = thermal noise of R2
For the OPAx140 series of operational amplifiers at 1 kHz, en = 5.1 nV/âHz.
Figure 34. Noise Calculation in Gain Configurations
18
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