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AD1893JN データシート(PDF) 9 Page - Analog Devices |
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AD1893JN データシート(HTML) 9 Page - Analog Devices |
9 / 20 page AD1893 REV. A –9– AMP TIME SUBFILTER COEFFICIENTS ALIGNED TO THE LEFT TSIN = 1/FSIN FREQ FSIN/2 FSIN/2 FSIN/2 FSIN/2 FSIN/2 PHASE DELAY = NOMINAL DELAY = NOMINAL DELAY = NOMINAL – .25/FSIN DELAY = NOMINAL – .5/FSIN DELAY = NOMINAL – .75/FSIN Figure 3. Four Polyphase Subfilters Realigned to Coarse Time Grid POLYPHASE FILTER 1 POLYPHASE FILTER 2 POLYPHASE FILTER 3 POLYPHASE FILTER 4 POLYPHASE FILTER 5 POLYPHASE FILTER 6 POLYPHASE FILTER 7 INPUT SIGNAL POLYPHASE FILTER N-1 POLYPHASE FILTER N SELECT N TO 1 MUX OUTPUT SIGNAL SAMPLE CLOCK TRACKING CIRCUIT Figure 4. Polyphase Filter Bank Model—Conceptual Block Diagram The full set of subfilters can be considered to form a parallel bank of “polyphase” filters which have decrementing, linear phase group delays. All of the polyphase filters conceptually process the input signal simultaneously, as illustrated in Figure 4, at the input sample rate. Asynchronous sample rate conversion under the polyphase filter bank model is accomplished by selecting the output of a particu- lar polyphase filter on the basis of the temporal relationship between the input sample clock and the output sample clock events. Figure 5 shows the desired filter group delay as a func- tion of the relative time difference between the current output sample clock and the last input sample clock. If an output sample is requested late in the input sample period, then a short filter delay is required, and if an output sample is requested early in the input sample period, then a long filter delay is re- quired. This nonintuitive result arises from the fact that FIR filters always produce some delay, so that selecting a filter with shorter delay moves the interpolated sample closer to the newest input sample. |
同様の部品番号 - AD1893JN |
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同様の説明 - AD1893JN |
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