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GC5016 Datasheet(PDF) 82 Page - Texas Instruments |
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GC5016 Datasheet(HTML) 82 Page - Texas Instruments |
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82 / 88 page  GC5016 SLWS142G − JANUARY 2003 − REVISED NOVEMBER 2005 www.ti.com 82 18.2 WCDMA (UMTS) This section describes an example of the down-conversion filter response for WCDMA. The GC5016 configuration values were input sample rate of 122.88 MHz, a CIC and PFIR decimation of four each for an overall decimation of 16, output rate of 7.68 MSPS, and 255 PFIR taps. The overall filter response filter, including both the CIC and PFIR filters, an optimized raised root cosine filter with α = 0.22, is shown in Figure 35 and Figure 36. The stop-band attenuation is better than –80 dBc for frequencies more than 2.5 MHz from the band center. −120 −100 −80 −60 −40 −20 0 −15 −10 −5 0 5 10 15 Frequency − MHz FILTER RESPONSE vs FREQUENCY Figure 35. UMTS Filter Response −120 −100 −80 −60 −40 −20 0 012345 Frequency − MHz FILTER RESPONSE vs FREQUENCY Figure 36. UMTS Filter Response Transition Region The cmd5016 configuration file and filter taps are available on the web. |
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