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HSP43216VC-52Z Datasheet(PDF) 5 Page - Intersil Corporation |
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HSP43216VC-52Z Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 20 page  5 FN3365.10 October 6, 2008 For added flexibility, a spectrally reversed version of the above process may be realized by configuring the Down Convert processor to impart a positive fS/4 spectral shift on the input signal. This has the effect of centering the lower sideband of the input signal at DC and is achieved by reversing the sign of the sine term in the quadrature mix as shown below: The direction of the spectral shift imparted by the Down Convert Processor is set by the Upper Sideband/ Lower Sideband control input, USB/LSB. When this input is high, a -fS/4 spectral shift is used to center the input signal’s upper sideband at DC. When asserted low, a spectral shift of fS/4 is used to center the lower sideband at DC. The SYNC control input may be used to synchronize the incoming data stream with the zero degree phase of the complex exponential as described in the Operational Modes section. The real and imaginary sample streams generated by the down convert operation are passed to the Halfband Filter block on the upper and lower processing legs respectively. The Down Convert Processor is only active in Down Convert and Decimate Mode, MODE1-0 = 10. In the other modes, the data on the upper and lower processing legs pass unaltered. 67-Tap Halfband Filter Processor The processing required to implement the 67-Tap Halfband filter is distributed across two polyphase branches comprised of even and odd tap filters as shown in Figure 1. The Even Tap Filter performs a filtering operation using the even indexed coefficients (even phase) of the halfband filter. The Odd Tap Filter uses the odd indexed coefficients (odd phase) of the halfband filter. NOTE: the odd tap filter’s processing reduces to a delay and scale operation since the center tap is the only non-zero odd tap for a halfband filter. Together the polyphase filters perform the sum of-products required to implement the 67-tap halfband filter in an architecture capable of supporting a variety of operational modes. The frequency response of the halfband filter is given graphically in Figure 2 and in tabular form in Table 3. Table 2 shows the different modes and the related frequency with which the spectra in Figure 2 is normalized. The polyphase implementation of the halfband filter provides the flexibility to realize a variety of filter configurations. In Decimate by Two Mode, the outputs of the each polyphase branch are summed to yield the filter output. In Interpolate by Two mode, the polyphase filters produce independent outputs which are multiplexed into a single sample stream at the interpolated data rate. In the Up Convert and Down Convert Modes, the polyphase branches filter the real and imaginary components of a complex sample stream with the equivalent of identical 67- Tap Halfband Filters. For these modes, the real component is processed by the Even Tap filter and the imaginary component is processed by the Odd Tap filter. The Operational Modes Section provides further details regarding the data flow and operation of the Filter Processor for the various modes. As a standard DSP term, group delay is defined as the time it takes to obtain valid filtered data given a certain input pattern. Both the Even Tap and Odd Tap filters have an identical group delay of 19 clocks relative to the operating mode of the halfband. The group delay has been specified in the data flow diagrams following this section. The delay clocks equal CLK when INT/EXT = 0 and CLK/2 when INT/EXT = 1. NOTE: Pipeline delay specifies the time it takes for bits to toggle at the output given a certain input pattern. The Odd tap filter has a pipeline delay of 19 CLKs with respect to the operating mode because it consists of only the center tap of the 67-tap halfband. The Even tap filter has a pipeline delay of 2-35 CLKs with respect to the operating mode. TABLE 2. NORMALIZED FREQUENCY vs MODE MODE fS Decimate by Two CLK Interpolate by Two CLK/2 Down Convert and Decimate CLK Quadrature to Real CLK/2 xn () ej πn2 ⁄ () x n () πn2 ⁄ () jx n () πn2 ⁄ () sin + cos = (EQ. 2) 0 -20 -40 -60 -80 -100 -120 0fS/4 FS/2 NORMALIZED FREQUENCY 3fS/8 fS/8 FIGURE 2. FREQUENCY RESPONSE OF 67-TAP HALFBAND FILTER HSP43216 |
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