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AS3933 데이터시트(PDF) 37 Page - ams AG

부품명 AS3933
상세설명  3D Low Frequency Wake-Up Receiver
PDF  64 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS3933 데이터시트(HTML) 37 Page - ams AG

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Page 36
ams Datasheet
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[v1-08] 2015-Sep-02
AS3933 − Detailed Description
Figure 41:
Antenna Damper
Demodulator / Data Slicer
As soon as the AS3933 detects successfully the frequency and
the RSSI has got stable the channel selector compares the RSSI
on all active channels and connects the channel amplifier which
has the biggest RSSI to the demodulator. The channel selector
needs 32 RF carrier periods to take this decision. The output
signal (amplified LF carrier) of selected channel is connected to
the input of the demodulator.
The demodulator takes the signal to base-band and recovers
two signals from the amplified RF signal; a fast and a slow
envelop. Those two signals are fed to the data slicer, which is a
comparator with programmable hysteresis. At the output of the
data slicer are streamed the digital received bits. A concept
block diagram is shown in the Figure 42.
Channel
Amplifier1
LC
R
LC
R
LC
R
Channel
Amplifier2
Channel
Amplifier1
LF1P
LF2P
LF3P
LFN



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