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HSP50210JI-52Z Datasheet(PDF) 9 Page - Intersil Corporation |
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HSP50210JI-52Z Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 51 page  FN3652.5 July 2, 2008 9 The I and D filter consists of an accumulator, a programmable shifter and a two sample summer, as shown in Figure 3. The programmable shifter is provided to compensate for the gain introduced by the accumulator (see Table 15). The accumulator provides Integrate and Dump Filtering for decimation factors up to 16. The two sample summer provides the moving average required for an additional decimation factor of 2. A decimation factor of 1 (bypass), 2, 4, 8, 16, or 32 may be selected. At the maximum decimation rate, a baseband signal sampled at 32x the symbol rate can be filtered. The output of the two sample summer is demultiplexed into two sample streams at the symbol rate. The demultiplexed data streams from the I and Q processing paths are fed to the Symbol Tracking Block and Soft decision slicer. The multiplexed data streams on I and Q are provided as one of the selectable inputs for the Cartesian-to-Polar Converter. Cartesian/Polar Converter The Cartesian/Polar Converter maps samples on the I and Q processing paths to their equivalent phase/magnitude representation. The magnitude conversion is equivalent to Equation 5: where 0.81 is the gain of the conversion process. The magnitude output is an 8-bit unsigned value ranging from 0.0 to 1.9922. 0 -20 -40 -60 -80 -100 0 fCLK FREQUENCY (NORMALIZED TO INPUT SAMPLE RATE) FIGURE 4. RRC FILTER IN HSP50210 10 2fCLK 10 3fCLK 10 4fCLK 10 fCLK 2 0 -0.18 -0.36 -0.54 -0.72 -0.90 0 -0.07 -0.14 -0.21 -0.28 -0.35 0 FREQUENCY (NORMALIZED TO INPUT SAMPLE RATE) fCLK 25 2fCLK 25 3fCLK 25 4fCLK 25 fCLK 5 FIGURE 5. PASSBAND RIPPLE OF RRC FILTER IN HSP50210 SHOWN BELOW ENLARGED FOR CLARITY 0 fCLK 40 fCLK 20 3fCLK 40 fCLK 10 3fCLK 20 5fCLK 40 TABLE 1. ROOT RAISED COSINE COEFFICIENTS COEFFICIENT INDEX COEFFICIENT 02 1-2 21 38 4-16 5-14 686 7 160 886 9-14 10 -16 11 8 12 1 13 -2 14 2 Mag (I, Q) 0.81 ()∗ I 2 Q 2 + () = (EQ. 5) HSP50210 |
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