AD8045ACPZ-R2 datasheet(20/26 Pages) AD

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AD8045

Data Sheet

Rev. B | Page 18 of 24

OUTPUT NOISE

Figure 66 shows the contributors to the noise at the output of a

noninverting configuration.

VOUT

–

VEN

VRF

VRG

VRS

IEN+

IEN–

Figure 66. Amplifier DC Errors

Ven , IN+, and IN− are due to the amplifier.

V ,

V , and

are due to the feedback network resistors, RG and RF, and

the source resistor, RS. The total output voltage noise,

OUT

is the rms sum of all the contributions.

OUT

(

) (

)

( )

( )2

kTR

||R

Ven

−

where:

Gn is the noise gain













Ven is the op amp input voltage noise.

IN is the op amp input current noise.

Table 6 lists the expected output voltage noise spectral density

for several gain configurations.

Table 6. Noise and Bandwidth for Various Gains

Gain

−3 dB

Bandwidth1

Output Noise

(nV/√Hz)

−

100

1 GHz

3.3

499

400 MHz

7.4

499

124

90 MHz

16.4

+10

499

40 MHz

−1

499

N/A2

300 MHz

7.4

RL = 1 kΩ.

N/A means not applicable.

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