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ADP150 Datasheet(PDF) 4 Page - Analog Devices |
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ADP150 Datasheet(HTML) 4 Page - Analog Devices |
4 / 5 page CN-0134 Circuit Note Rev. B | Page 4 of 5 Table 3. Single-Carrier W-CDMA Composite EVM Results Comparing Filter vs. No Filter on ADF4350 RF Outputs (Measured As Per 3GPP Specification Test Model 4) Frequency (MHz) Composite EVM No LO Filtering Composite EVM with LO Filtering, Filter C Modulator Output Power (dBm) 2140 3.50% 1.80% −7 1800 3.40% 1.50% −7 900 3.30% 0.90% −7 Error vector magnitude (EVM) is a measure of the quality of the performance of a digital transmitter or receiver and is a measure of the deviation of the actual constellation points from their ideal locations, due to both magnitude and phase errors. This is shown in Figure 5. EVM measurements are given in Table 3 comparing results with and without the filter. In this case the baseband I/Q signals were generated using 3GPP test model 4 using a Rhode and Schwarz AMIQ I/Q Modulation Generator with differential I and Q analog outputs. Filter b was also used. A block diagram of the test setup for EVM is given in Figure 6. Adjacent channel leakage ratio (ACLR) is a measure of the power in adjacent channels relative to the main channel power and is specified in dBc. The LO phase noise and the linearity of the modulator are the main contributors to ACLR. The ACLR test setup is the same as for EVM with the exception that coaxial filters were placed on the I/Q outputs of the signal generator to reduce aliasing products. R&S AMIQ GEN. I+ I– Q+ Q– SPECTRUM ANALYZER [R&S FSQ 8] POWER SUPPLY CN-0134 EVALUATION BOARD 5.5V RF OUT Figure 6. EVM Measurement Setup (Simplified Diagram) In addition to the improvement in sideband suppression and EVM, there is also a performance benefit to driving the ADL5375 LO inputs differentially. This improves modulator OIP2 performance by 2 dB to 5 dB, compared with single- ended LO drive. Note that most external VCOs only come with a single-ended output, so using the differential outputs on the ADF4350 provides a benefit over an external VCO in this case. Figure 7 shows sideband suppression results using an 850 MHz to 2450 MHz filter (filter b). 10 –60 –50 –40 –30 –20 –10 0 0 500 1000 1500 2000 2500 3000 3500 FREQUENCY (MHz) SSB #10 +5dBm SSB #10 +2dBm SSB #10 –1dBm SSB #10 –4dBm Figure 7. Sideband Suppression Results for 850 MHz to 2450 MHz Filter b A complete design support package for this circuit note can be found at http://www.analog.com/CN0134-DesignSupport. COMMON VARIATIONS It is possible to use the auxiliary outputs on the ADF4350 to switch between two filter types where wideband operation beyond that possible with one single filter is required. This is shown in Figure 8. An RF double-pole, 4-throw switch (DP4T) is used to select the differential outputs of either Filter 1 or Filter 2. |
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Similar Description - ADP150 |
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