AD8341 datasheet(16/20 Pages) AD

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AD8341

Rev. 0 | Page 16 of 20

As the output power drops, the noise floor, measured in dBm in

1 MHz BW at 50 MHz carrier offset, drops slightly.

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–80

–75

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–65

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–55

–50

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–5

OUTPUT POWER (dBm)

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–55

–60

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–100

ACPR 5MHz OFFSET

ACPR 10MHz OFFSET

NOISE –50MHz OFFSET

Figure 39. AD8341 ACPR and Noise vs. Output Power;

Single-Carrier WCDMA (Test Model 1-64 at 2140 MHz)

Figure 40 shows how output power, ACPR, and noise vary with

the differential I and Q control voltages. VBBI and VBBQ are tied

together and are varied from 0.5 V to 50 mV.

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–45

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0.1

0.2

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0.5

IQ CONTROL VOLTAGE

–40

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–50

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–60

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–90

OUTPUT POWER dBm

ACPR 10MHz OFFSET

NOISE –50MHz OFFSET

ACPR 5MHz OFFSET

Figure 40. AD8341 Output Power, ACPR and Noise vs. VIQ.

Single-Carrier WCDMA (Test Model 1-64 at 2140 MHz)

In this case, adjacent channel power ratio remains constant as

the (noise dominated) alternate channel power degrades

roughly 1-for-1 with output power. As the I and Q control volt-

age drops, the noise floor again drops slowly.

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