AS3933 datasheet(37/64 Pages) AMSCO

tên linh kiện	AS3933

Giải thích chi tiết về linh kiện	3D Low Frequency Wake-Up Receiver

PDF	64 Pages

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nhà sản xuất	AMSCO [ams AG]

Trang chủ	http://www.ams.com

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37 / 64 page

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

Channel

Amplifier2

Channel

Amplifier1

LF1P

LF2P

LF3P

LFN

AS3933 bảng dữ liệu(PDF) 37 Page - ams AG