ADRF6518ACPZ-R7 datasheet(19/39 Pages) AD

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Data Sheet

ADRF6518

Rev. A | Page 19 of 39

CHARACTERIZATION

Figure 67. Gain Distribution for HD2/HD3 vs. Gain

Figure 67 shows the ADRF6518 analog gain distribution for the

HD2 vs. gain and HD3 vs. gain plots while the gain and input

voltage levels were swept and while keeping the output voltage

level at 1.5 V p-p.

NOISE FIGURE CALCULATION

All of the noise figure plots (see Figure 23, Figure 24, and

Figure 56) were completed by input referring the output noise

density and then dividing it by the theoretical noise density of a

50 Ω resister. The input SMA on the evaluation board was

terminated with a 50 Ω resistor to ground, which provided the

ADRF6518 input with a 400 Ω differential impedance via the 8:1

balun. In signal chain calculations, it is often convenient to

reference the noise figure to 50 Ω, even though the ADRF6518

input is terminated in 400 Ω.

The noise factor is calculated as follows:





GAIN

Factor

Noise

OUT

where the noise densities are in nV/√Hz and GAIN is in linear

terms. The noise figure is then

Noise Figure = 10 log10(Noise Factor)

1.2

0.8

0.4

1.0

0.6

0.2

–12 –6

121824

3036

4248

5460

GAIN (dB)

SOLID LINES, DIGITAL GAIN CODE = 0000001

DASHED LINES, DIGITAL GAIN CODE = 0000000

VGN1

VGN2

VGN3

VGN1

VGN2

VGN3

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