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ADRF6620ACPZ-R7 Datasheet(PDF) 34 Page - Analog Devices |
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ADRF6620ACPZ-R7 Datasheet(HTML) 34 Page - Analog Devices |
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34 / 52 page ![]() ADRF6620 Data Sheet Rev. 0 | Page 34 of 52 As an example, the MIXER_RDAC, MIXER_CDAC, and MIXER_ BIAS settings of the ADRF6620 were carefully selected, based on three individual goals that resulted in three sets of MIXER_RDAC, MIXER_CDAC, and MIXER_BIAS values. The first goal was for optimized IIP3. To achieve the most optimal IIP3 performance, the MIXER_BIAS was set to a higher current setting, and MIXER_ RDAC and MIXER_CDAC were selected at the peaks. This configuration allowed for the most optimal IIP3 performance. However, it also consumed the most power, and the noise figure was degraded. The second goal was to achieve a balance among IIP3, the noise figure, and power consumption. Finally, the third goal was for an optimized noise figure. This configuration resulted in the lowest power consumption while IIP3 was not optimized. Table 15 summarizes the test conditions; Table 16 shows the cor- responding MIXER_RDAC, MIXER_CDAC, and MIXER_BIAS values. The resulting IIP3 and noise figure performance for the specific MIXER_RDAC, MIXER_CDAC, and MIXER_BIAS settings are shown in Figure 84. 0 5 10 15 20 25 30 35 40 45 50 0.6 1.1 1.6 2.1 2.6 RF FREQUENCY (GHz) IIP3 NOISE FIGURE IIP3: OPT IIP3 IIP3: OPT NOISE FIGURE IIP3: IIP3 AND NOISE FIGURE BALANCE NF: OPT IIP3 NF: OPT NOISE FIGURE NF: IIP3 AND NOISE FIGURE BALANCE Figure 84. Example IIP3 and Noise Figure Optimization Table 15. Mixer Optimization Summary Parameter Test Conditions/Comments Optimized IIP3 MIXER_RDAC, MIXER_CDAC, and MIXER_BIAS were configured for optimized IIP3 performance. Noise Figure, IIP3, and Power Consumption Balance MIXER_BIAS was limited to 0, 1, or 2 decimal for improved noise figure while allowing IIP3 to degrade. MIXER_RDAC and MIXER_CDAC were chosen for optimized IIP3 because MIXER_RDAC and MIXER_CDAC have a larger impact on IIP3 than on noise figure. Optimized Noise Figure MIXER_BIAS was set to 0 decimal for the best noise figure. MIXER_RDAC and MIXER_CDAC were chosen for optimized IIP3 because they have a larger impact on IIP3 than on noise figure. Table 16. Recommended BAL_CIN, BAL_COUT, MIXER_RDAC, MIXER_CDAC, and MIXER_BIAS Settings (in Decimal) RF Frequency (MHz) BAL_CIN BAL_COUT Optimized IIP3 IIP3 and Noise Figure Balance Optimized Noise Figure RDAC CDAC BIAS RDAC CDAC BIAS RDAC CDAC BIAS 600 7 7 6 10 4 4 15 2 4 15 0 700 7 7 5 14 4 4 15 2 4 15 0 800 5 5 3 13 3 3 14 2 2 15 0 900 3 4 0 15 0 3 13 2 2 14 0 940 3 3 5 12 4 5 11 2 2 13 0 1000 2 3 5 11 4 4 10 2 3 11 0 1100 1 2 5 10 4 3 10 1 2 11 0 1200 1 2 5 9 4 3 9 1 2 10 0 1300 0 2 8 8 4 3 9 1 2 10 0 1400 0 2 6 7 4 4 8 1 2 9 0 1500 0 2 6 7 4 5 7 2 3 8 0 1600 0 2 8 7 4 5 7 2 2 8 0 1700 0 1 6 6 4 5 6 2 4 7 0 1800 0 1 9 6 4 5 6 2 4 7 0 1840 0 1 9 6 5 5 6 2 3 7 0 1900 0 1 9 6 5 6 5 2 3 7 0 2000 0 1 7 5 5 3 6 0 3 6 0 2100 1 1 9 5 5 5 5 1 3 6 0 2140 1 1 9 5 4 5 5 1 3 6 0 2200 2 0 7 4 4 5 5 1 3 6 0 2300 2 0 7 4 4 5 5 1 3 6 0 2400 1 0 7 4 4 5 5 1 3 6 0 2500 1 0 7 4 4 5 5 1 3 6 0 2600 1 0 7 4 4 5 5 1 3 6 0 2700 1 0 7 4 4 5 5 1 3 6 0 2800 1 0 7 4 4 4 15 2 4 15 0 2900 1 0 7 4 4 4 15 2 4 15 0 3000 0 0 7 4 4 3 14 2 2 15 0 |
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