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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HDM8515P датащи(PDF) 68 Page - Hynix Semiconductor |
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HDM8515P датащи(HTML) 68 Page - Hynix Semiconductor |
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68 / 75 page  68 Figure A2 illustrates the transient response of the carrier tracking loop with the same loop bandwidth settings at high signal-to-noise ratio. The phase step for this test corresponds to 45 degrees. The actual bandwidth of the carrier loop is greater than that of the symbol loop for the same settings because the carrier loop must cope with greater dynamics (such as frequency offset and drift). Figure A3 illustrates the transient response of the carrier phase tracking loop under the same conditions at minimum signal-to-noise ratio (Eb/N0 of 4 dB with rate 1/2 coding). The highest bandwidth case will pull in with a carrier frequency error of + or - .005 of the symbol rate at this minimum signal level. Higher loop bandwidth may be programmed to provide greater pull-in with higher signal-to-noise ratio conditions. FIGURE A2: CARRIER PHASE RECOVERY TRANSIENT RESPONSE |
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