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AS3933 数据表(PDF) 39 Page - ams AG |
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AS3933 数据表(HTML) 39 Page - ams AG |
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39 / 64 page ![]() Page 38 ams Datasheet Document Feedback [v1-08] 2015-Sep-02 AS3933 − Detailed Description Figure 44: Bit Setup of the Fast Envelope for Different Symbol Rates On one hand the fast envelope's time constant ( R3<2:0>) needs to be adjusted to the desired symbol rate as shown in Figure 44. However, decreasing the fast envelope's time constant also means that more noise will be injected due to the wider band. On the other hand, the slow envelop signal acts as an average of the incoming data. Therefore, the bigger its time constant is, the better will be the noise rejection. Yet, a bigger time constant of the slow envelop (R3<5:3>) requires a longer preamble in order to settle to the correct value. The minimum preamble length as a function of the slow envelope's settings is given in Figure 45. R3<2> R3<1> R3<0> Symbol Rate [Manchester Symbols/s] 0 0 0 4096 0 0 1 2184 0 1 0 1490 0 1 1 1130 1 0 0 910 1 0 1 762 1 1 0 655 1 1 1 512 |
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