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AS3933 Datenblatt(PDF) 39 Page - ams AG

Teilenummer AS3933
Bauteilbeschribung  3D Low Frequency Wake-Up Receiver
PDF  64 Pages
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Hersteller  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3933 Datenblatt(HTML) 39 Page - ams AG

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Page 38
ams Datasheet
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[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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