AD8045ACPZ-R2 datasheet(18/24 Pages) AD

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AD8045

Rev. A | 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.

, and

are due to the feedback network resistors. R

and RF, and

source resistor, RS. Total output voltage noise,

OUT

, is the

rms sum of all the contributions.

OUT

() () ()

()

( )2

kTR

||R

Ven

−

where:

is the noise gain

⎟

⎠

⎞

⎜

⎝

⎛

Ven

is the op amp input voltage noise.

is the op amp input current noise.

Table 7 lists the expected output voltage noise spectral density

for several gain configurations.

Table 7. 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/A

300 MHz

7.4

1 RL = 1 kΩ.

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