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ADRF6620ACPZ-R7 Datasheet(PDF) 32 Page - Analog Devices

No. de pieza ADRF6620ACPZ-R7
Descripción Electrónicos  700 MHz to 2700 MHz Rx Mixer with Integrated IF DGA, Fractional-N PLL, and VCO
PDF  52 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADRF6620ACPZ-R7 Datasheet(HTML) 32 Page - Analog Devices

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ADRF6620
Data Sheet
Rev. 0 | Page 32 of 52
Figure 76 to Figure 83 show the IIP3 and noise figure sweeps for
all MIXER_RDAC, MIXER_CDAC, and MIXER_BIAS combi-
nations. The IIP3 vs. MIXER_RDAC and MIXER_CDAC figures
show both a surface and a contour plot in one figure. The contour
plot is located directly underneath the surface plot. The best
approach for reading the figure is to localize the peaks on the
surface plot, which indicate maximum IIP3, and to follow the
same color pattern to the contour plot to determine the optimized
MIXER_RDAC and MIXER_CDAC values. The overall shape
of the IIP3 plot does not vary with the MIXER_BIAS setting;
therefore, only MIXER_BIAS = 011 is displayed.
0
5
10
15
0
5
10
15
20
25
30
35
40
MIXER_RDAC
Figure 76. IIP3 vs. MIXER_RDAC, MIXER_CDAC; MIXER_BIAS = 011
at RF Frequency = 900 MHz
0
5
10
15
0
5
10
15
20
25
30
35
40
MIXER_CDAC
Figure 77. IIP3 vs. MIXER_RDAC, MIXER_CDAC; MIXER_BIAS = 011
at RF Frequency = 1900 MHz
The data shows that MIXER_BIAS has the largest impact on
performance. As previously mentioned and evident in the data,
IIP3 improves with increased MIXER_BIAS, and noise figure is
optimized at the lowest bias setting. Taking a more detailed look
at the data, the different MIXER_RDAC and MIXER_CDAC
combinations can result in a ~5 dB to +10 dB change in IIP3, but
the noise figure changes by only ~0.5 dB. These trends become
very important in deciding the trade-offs between IP3, noise figure,
and power consumption. The total current consumption of the
ADRF6620 does not change with MIXER_RDAC and MIXER_
CDAC and varies only with the mixer bias settings (see Figure 75).
15.0
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
MIXER_RDAC
MIXER_CDAC
900-0
900-2
900-4
900-6
900-7
MIXER BIAS
0
1
2
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
3
4
5
7
8
10
11
13
14
6
9
12
15
Figure 78. Noise Figure vs. MIXER_RDAC, MIXER_CDAC, and
Various MIXER_BIAS Values at RF Frequency = 900 MHz
MIXER_RDAC
MIXER_CDAC
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
20.5
21.0
21.5
15.0
22.0
0
1
2
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
15
0 7
3
4
5
7
8
10
11
13
14
6
9
12
15
1900-0
1900-2
1900-4
1900-6
1900-7
MIXER BIAS
Figure 79. Noise Figure vs. MIXER_RDAC, MIXER_CDAC, and
Various MIXER_BIAS Values at RF Frequency = 1900 MHz



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