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ADL5535ARKZ-R7 Arkusz danych(PDF) 11 Page - Analog Devices |
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ADL5535ARKZ-R7 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 16 page ADL5535 Rev. 0 | Page 11 of 16 ACPR PERFORMANCE Figure 17 shows a plot of the adjacent channel power ratio (ACPR) vs. POUT for the ADL5535. The signal type used is a single wideband code division multiple access (W-CDMA) carrier (Test Model 1-64). This signal is generated by a very low ACPR source. ACPR is measured at the output by a high dynamic range spectrum analyzer that incorporates an instru- ment noise-correction function. At an output power level of +8 dBm, ACPR is still very low at −65 dBc, making the device suitable for use in driver applications. –85 –80 –75 –70 –65 –60 –55 –50 –45 –40 –35 –5 –3 –1 13579 11 13 POUT (dBm) 380MHz 190MHz 190MHz SOURCE POWER OUTPUT REFERRED 380MHz SOURCE POWER OUTPUT REFERRED Figure 17. ACPR vs. POUT, Single W-CDMA Carrier (Test Model 1-64) at 190 MHz and 380 MHz ERROR VECTOR MAGNITUDE (EVM) PERFORMANCE Error vector magnitude (EVM) is a measure used to quantify the performance of a digital radio transmitter or receiver. A signal received by a receiver has all constellation points at their ideal locations; however, various imperfections in the implementation (such as magnitude imbalance, noise floor, and phase imbalance) cause the actual constellation points to deviate from their ideal locations. The ADL5535 shows excellent performance when used with higher-order modulation schemes, such as a 16 QAM. Figure 18 illustrates the EVM performance of the ADL5535 when driven with a 16 QAM 10 Msym/s signal. Degradation of the EVM performance starts to occur at an output power of +12 dBm. –45 –40 –35 –30 –25 –20 4 6 8 10 12 14 16 18 POUT (dBm) 380MHz SOURCE POWER OUTPUT REFERRED 380MHz 190MHz 190MHz SOURCE POWER OUTPUT REFERRED Figure 18. EVM Performance vs. POUT with a 16 QAM, 10 Msym/s Signal |
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