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ADL5380ACPZ-R7 Datasheet(PDF) 25 Page - Analog Devices |
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ADL5380ACPZ-R7 Datasheet(HTML) 25 Page - Analog Devices |
25 / 36 page ADL5380 Rev. 0 | Page 25 of 36 Figure 83 shows the zero-IF EVM performance of a 10 MHz IEEE 802.16e WiMAX signal through the ADL5380. The differential dc offsets on the ADL5380 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. Figure 84 exhibits multiple W-CDMA low-IF EVM performance curves over a wide RF input power range into the ADL5380. 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. –45 –40 –35 –30 –25 –20 –15 –10 –80 –70 –60 –50 –40 –30 –20 –10 0 10 RF INPUT POWER (dBm) 0Hz IF 5MHz LOW-IF 7.5MHz LOW-IF 2.5MHz LOW-IF –60 –50 –40 –30 –20 –10 0 –75 –65 –55 –45 –35 –25 –15 –5 5 RF INPUT POWER (dBm) 5.8GHz 3.5GHz 2.6GHz Figure 84. EVM, RF = 1900 MHz, IF = 0 Hz, IF = 2.5 MHz, IF = 5 MHz, and IF = 7.5 MHz vs. RF Input Power for a W-CDMA Signal (AC-Coupled Baseband Outputs) LOW IF IMAGE REJECTION The image rejection ratio is the ratio of the intermediate frequency (IF) signal level produced by the desired input frequency to that produced by the image frequency. The image rejection ratio is expressed in decibels. Appropriate image rejection is critical because the image power can be much higher than that of the desired signal, thereby plaguing the down-conversion process. Figure 85 illustrates the image problem. If the upper sideband (lower sideband) is the desired band, a 90° shift to the Q channel (I channel) cancels the image at the lower sideband (upper sideband). Phase and gain balance between I and Q channels are critical for high levels of image rejection. Figure 83. EVM, RF = 2.6 GHz, RF = 3.5 GHz, and RF = 5.8 GHz, IF = 0 Hz vs. RF Input Power for a 16 QAM 10 MHz Bandwidth Mobile WiMAX Signal (AC-Coupled Baseband Outputs) 0° 0° SIN ωLOt COS ωLOt ωIF ωIF ωLSB ωUSB – ωIF 0+ ωIF 0+ ωIF 0+ ωIF – ωIF 0+ ωIF ωLO –90° +90° Figure 85. Illustration of the Image Problem |
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