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AD8341-EVAL 数据表(PDF) 16 Page - Analog Devices |
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AD8341-EVAL 数据表(HTML) 16 Page - Analog Devices |
16 / 20 page 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. –30 –80 –75 –70 –65 –60 –55 –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 5 OUTPUT POWER (dBm) –50 –55 –60 –65 –70 –75 –80 –85 –90 –95 –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. 0 –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 0.1 0.2 0.3 0.4 0.5 IQ CONTROL VOLTAGE –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –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. |
类似零件编号 - AD8341-EVAL |
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类似说明 - AD8341-EVAL |
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