ADA4350ARUZ-R7 datasheet(34/38 Pages) AD

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Data Sheet

ADA4350

Rev. B | Page 33 of 37

OPEN-LOOP GAIN

G = 1

fGBW

G = 1 + CS/CF

I TO V GAIN

–135°

–90°

–45°

0°

45°

90°

G = RFCS(s)

Figure 60. Signal and Noise Gain and Phase of the Transimpedance Amplifier

Design with Compensation

The dominant output noise sources in the transimpedance

amplifier design are the input voltage noise of the amplifier,

VNOISE, and the resistor noise due to RF. The effect due to the

current noise is negligible in comparison. The gray line in

Figure 60 shows the noise gain and phase over frequencies for

the transimpedance amplifier. The noise bandwidth is at the fN

frequency, and is calculated by

GBW

)

(





(9)

Table 17 shows the dominant noise sources (RF and VNOISE) for

the transimpedance amplifier when it has a 45° phase margin for

the maximum bandwidth, and in this case, fZ = fX = fN.

Table 17. RMS Noise Contributions of Transimpedance

Amplifier

Contributor

Expression



4kT

VNOISE





NOISE







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