AD8370 datasheet(9/28 Pages) AD

9 / 28 page

AD8370

Rev. 0 | Page 9 of 28

–90

–80

–70

–60

–50

–40

–30

–20

–10

100

120

140

GAIN CODE

HIGH GAIN, RL = 1kΩ

LOW GAIN, RL = 1kΩ

LOW GAIN, RL = 100Ω

HIGH GAIN, RL = 100Ω

Figure 16. Second-Order Harmonic Distortion vs. Gain Code at 70 MHz,

VOUT = 2 V p-p Differential

1GHz

5MHz

S22

S11

180

330

270

300

120

240

150

210

Figure 17. Input and Output Reflection Coefficients, S11 and S22,

ZO = 100 Ω Differential

100

150

200

250

–150

–100

–50

100

200

300

400

500

600

700

FREQUENCY (MHz)

16 DIFFERENT GAIN

CODES REPRESENTED

R+jX FORMAT

Figure 18. Input Resistance and Reactance vs. Frequency

–90

–80

–70

–60

–50

–40

–30

–20

–10

100

120

140

GAIN CODE

LOW GAIN RL = 100Ω

LOW GAIN RL = 1kΩ

HIGH GAIN RL = 100Ω

HIGH GAIN RL = 1kΩ

Figure 19. Third-Order Harmonic Distortion vs. Gain Code at 70 MHz,

VOUT = 2 V p-p Differential

–90

–80

–70

–60

–50

–40

–30

–20

–10

200

150

100

250

300

350

400

FREQUENCY (MHz)

HD2 RL = 100Ω

HD3 RL = 100Ω

HD3 RL = 1kΩ

HD2 RL = 1kΩ

Figure 20. Harmonic Distortion vs. Frequency at Maximum Gain,

VOUT = 2 V p-p Composite Differential

100

120

–40

–20

100

200

300

400

500

600

700

FREQUENCY (MHz)

16 DIFFERENT GAIN

CODES REPRESENTED

R+jX FORMAT

Figure 21. Output Resistance and Reactance vs. Frequency

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