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ADL5382 Datasheet(PDF) 16 Page - Analog Devices |
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ADL5382 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 28 page  ADL5382 Rev. 0 | Page 16 of 28 ERROR VECTOR MAGNITUDE (EVM) PERFORMANCE EVM is a measure used to quantify the performance of a digital radio transmitter or receiver. A signal received by a receiver would have all constellation points at the 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 the ideal locations. The ADL5382 shows excellent EVM performance for various modulation schemes. Figure 45 shows the EVM performance of the ADL5382 with a 16 QAM, 200 kHz low IF. –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 –65 –85 –75 –55 –45 –35 –25 –15 –5 RF INPUT POWER (dBm) Figure 45. EVM, RF = 900 MHz, IF = 200 kHz vs. RF Input Power for a 16 QAM 160 ksym/s Signal Figure 46 shows the zero-IF EVM performance of a 10 MHz IEEE 802.16e WiMAX signal through the ADL5382. The differential dc offsets on the ADL5382 are in the order of a few millivolts. However, ac coupling the baseband outputs with 10 μF capacitors eliminates dc offsets and enhances EVM performance. With a 10 MHz BW signal, 10 μF ac coupling capacitors with the 500 Ω differential load results in a high-pass corner frequency of ~64 Hz, which absorbs an insignificant amount of modulated signal energy from the baseband signal. By using ac-coupling capacitors at the baseband outputs, the dc offset effects, which can limit dynamic range at low input power levels, can be eliminated. –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 –65 –60 –55 –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 5 10 RF INPUT POWER (dBm) Figure 46. EVM, RF = 2.6 GHz, IF = 0 Hz vs. RF Input Power for a 16 QAM 10 MHz Bandwidth Mobile WiMAX Signal (AC-Coupled Baseband Outputs) Figure 47 exhibits multiple W-CDMA low-IF EVM performance curves over a wide RF input power range into the ADL5382. In the case of zero-IF, the noise contribution by the vector signal analyzer becomes predominant at lower power levels, making it difficult to measure SNR accurately. –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 –75 –70 –65 –60 –55 –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0Hz 7.5MHz 5MHz RF INPUT POWER (dBm) 2.5MHz Figure 47. EVM, RF = 1900 MHz, IF = 0 Hz, 2.5 MHz, 5 MHz, and 7.5 MHz vs. RF Input Power for a W-CDMA Signal (AC-Coupled Baseband Outputs) |
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