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| OPA1641 Datasheet, PDF (19/31 Pages) Texas Instruments – High-Performance, JFET-Input AUDIO OPERATIONAL AMPLIFIERS | |||
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A) Noise in Noninverting Gain Configuration
R2
R1
EO
RS
VS
OPA1641, OPA1642, OPA1644
SBOS484C â DECEMBER 2009 â REVISED DECEMBER 2015
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
RS
EO
VS
Noise at the output:
2
EO2 =
1 + R2
R1 + RS
en2 +
R2
R1 + RS
2
e12 + e22 +
R2
R1 + RS
2
es2
Where eS =
e1 =
e2 =
4kTRS = thermal noise of RS
4kTR1 = thermal noise of R1
4kTR2 = thermal noise of R2
For the OPA164x series op amps at 1kHz, en = 5.1nV/ÃHz
Figure 33. Noise Calculation in Gain Configurations
Copyright © 2009â2015, Texas Instruments Incorporated
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