ADRF6614ACPZ-R7 datasheet(40/61 Pages) AD

40 / 61 page

ADRF6614

Data Sheet

Rev. 0 | Page 40 of 61

MIXER OPTIMIZATION

RF INPUT BALUN INSERTION LOSS OPTIMIZATION

At lower input frequencies, more capacitance is needed. This

increase is achieved by programming higher codes into

BAL_COUT. At high frequencies, less capacitance is required;

therefore, lower BAL_COUT codes are appropriate.

As shown in Figure 112 and Figure 113, this tuning range can

be further optimized by adding capacitance across the RF input

in conjunction with tuning BAL_COUT. This added capacitance

can help to increase the low frequency range of the device

significantly.

–20

–18

–16

–14

–12

–10

–8

–6

–4

–2

500

900

1300

1700

2100

2500

2900

RF FREQUENCY (MHz)

NO CAP

1pF

2pF

3.3pF

4pF

5.6pF

6.8pF

Figure 112. Return Loss; Optimum BAL_COUT vs. RF Frequency for Various

Tuning Capacitor Values on RFINx Using a High-Side LO

–20

–18

–16

–14

–12

–10

–8

–6

–4

–2

500

900

1300

1700

2100

2500

2900

RF FREQUENCY (MHz)

NO CAP

1pF

2pF

3.3pF

4pF

5.6pF

6.8pF

Figure 113. Return Loss; Optimum BAL_COUT vs. RF Frequency for Various

Tuning Capacitor Values on RFINx Using a Low-Side LO

IIP3 OPTIMIZATION

In applications in which performance is critical, the ADRF6614

offers IIP3 optimization. The IF amplifier bias current can be

reduced to trade performance vs. power consumption. This

tradeoff saves on the overall power at the expense of degraded

performance.

Figure 114 to Figure 117 show the IIP3 sweeps for all combinations

of IFA main bias and linearity bias. The IIP3 vs. main bias and

linearity bias 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 IFA main bias and linearity bias settings.

IFA_MAINBIAS

IFA_LINBIAS = 0

IFA_LINBIAS = 1

IFA_LINBIAS = 2

IFA_LINBIAS = 3

IFA_LINBIAS = 4

IFA_LINBIAS = 5

IFA_LINBIAS = 6

IFA_LINBIAS = 7

IFA_LINBIAS = 8

IFA_LINBIAS = 9

IFA_LINBIAS = 10

IFA_LINBIAS = 11

IFA_LINBIAS = 12

IFA_LINBIAS = 13

IFA_LINBIAS = 14

Figure 114. IIP3 vs. Main Bias (IFA_MAINBIAS) and Linearity Bias

(IFA_LINBIAS) Level at IF Frequency = 50 MHz

IFA_MAINBIAS

IFA_LINBIAS = 0

IFA_LINBIAS = 1

IFA_LINBIAS = 2

IFA_LINBIAS = 3

IFA_LINBIAS = 4

IFA_LINBIAS = 5

IFA_LINBIAS = 6

IFA_LINBIAS = 7

IFA_LINBIAS = 8

IFA_LINBIAS = 9

IFA_LINBIAS = 10

IFA_LINBIAS = 11

IFA_LINBIAS = 12

IFA_LINBIAS = 13

IFA_LINBIAS = 14

Figure 115. IIP3 vs. Main Bias (IFA_MAINBIAS) and Linearity Bias

(IFA_LINBIAS) Level at IF Frequency = 100 MHz

IFA_MAIN

IFA_LINBIAS = 0

IFA_LINBIAS = 1

IFA_LINBIAS = 2

IFA_LINBIAS = 3

IFA_LINBIAS = 4

IFA_LINBIAS = 5

IFA_LINBIAS = 6

IFA_LINBIAS = 7

IFA_LINBIAS = 8

IFA_LINBIAS = 9

IFA_LINBIAS = 10

IFA_LINBIAS = 11

IFA_LINBIAS = 12

IFA_LINBIAS = 13

IFA_LINBIAS = 14

Figure 116. IIP3 vs. Main Bias (IFA_MAINBIAS) and Linearity Bias

(IFA_LINBIAS) Level at IF Frequency = 150 MHz

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