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AD1890 Datasheet(PDF) 9 Page - Analog Devices |
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AD1890 Datasheet(HTML) 9 Page - Analog Devices |
9 / 20 page AD1890/AD1891 REV. 0 –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 PARALLEL POLYPHASE FILTER BANK 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 pro- cess the input signal simultaneously, as illustrated in Figure 4, at the input sample rate. |
Similar Part No. - AD1890_15 |
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Similar Description - AD1890_15 |
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