WCDMA / CDMA2000®Inter modulation Calibration for Zero IF Chipsets Application Note
■This application note is a guide to configure the R&S® CMU200 for such an application.
■Overview
●In the traditional HW design of cellphones the RF signal is converted to and from the baseband in several steps. In the Rx path the signal is converted from RF to IF and then to baseband, in the Tx path the process occurs in the opposite direction.3
●However, an architecture based on a direct conversion technology or zero IF (ZIF) offers tremendous advantages by decreasing parts count, saving board space and enabling smaller form factors. IF or SAW filters are also not necessary in a zero IF HW design.
●Zero IF technology has been used in the cellphone design for a long time. Technical barriers have prohibited practical implementation in 1CDMA2000® and WCDMA devices. The mass production of direct conversion chips for CDMA2000® as well as WCDMA applications has only become feasible with recent improvements in semiconductor processes, coupled with the development of high-speed, low power digital processors.
●The direct conversion technologies also create additional technical challenges, such as second-order inter-modulation (IM2).
●The verification of the IM2 performance requires specific test signals with a very low broadband noise level.
●These test signals can be generated with the R&S® CMU200 using the extremely flexible RF generator (RF function group), offering e.g. FM, AM or SSB (Single Side Band), DSB (Dual Side band) modulation with configurable modulation frequency and modulation index. There is no longer any need to use an additional signal generator.
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CDMA2000 、 CMU200 、 R&S®CMU200 、 R&S®CMU-B21 、 R&S®CMU-B68 、 R&S®CMU-B56 、 R&S®CMU-U65 、 R&S®CMU-K61 、 R&S®CMU-K62 、 R&S®CMU-K63 、 R&S®CMU-K65 、 R&S®CMU-K66 、 R&S®CMU-K67 、 R&S®CMU-K68 、 R&S®CMU-K69 、 R&S®CMU-B83 、 R&S®CMU-K83 、 R&S®CMU-K84 、 R&S®CMU-K85 、 R&S®CMU-K86 、 R&S®CMU-U84 、 1100.0008.02 、 1100.5200.54 、 1149.9809.02 、 1150.1850.14 、 1100.7402.04 、 1157.3670.02 、 1157.3770.02 、 1157.3870.02 、 1115.4891.02 、 1115.5100.02 、 1150.3000.02 、 1115.5300.02 、 1115.5400.02 、 1150.0301.12 、 1150.3500.02 、 1150.3600.02 、 1150.3700.02 、 1150.3800.02 、 1159.1500.02 |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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12.2004 |
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1CM 54_1E |
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196 KB |
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