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| OPA1652_15 Datasheet, PDF (13/29 Pages) Texas Instruments – Low Noise and Distortion, General-Purpose, FET-Input AUDIO OPERATIONAL AMPLIFIERS | |||
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www.ti.com
A) Noise in Noninverting Gain Configuration
R2
R1
EO
RS
VS
OPA1652
OPA1654
Noise at the output:
SBOS477 â DECEMBER 2011
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
VS
EO
Where eS =
e1 =
e2 =
4kTRS = thermal noise of RS
4kTR1 = thermal noise of R1
4kTR2 = thermal noise of R2
Note: For the OPA165x series of op amps at 1kHz, en = 4.5nV/âHz.
Figure 38. Noise Calculation in Gain Configurations
Copyright © 2011, Texas Instruments Incorporated
13
Product Folder Link(s): OPA1652 OPA1654
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