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AS3911 bảng dữ liệu(PDF) 32 Page - ams AG

tên linh kiện AS3911
Giải thích chi tiết về linh kiện  NFC Initiator / HF Reader IC
PDF  149 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
Logo AMSCO - ams AG

AS3911 bảng dữ liệu(HTML) 32 Page - ams AG

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AS3911 – 32
ams Datasheet, Confidential: 2013-Oct [2-03]
A p pl i c at io n I n f o r m at i o n
Phase Detector
The phase detector is observing phase difference between the
transmitter output signals (RFO1 and RFO2) and the receiver
input signals RFI1 and RFI2, which are proportional to the signal
on the antenna LC tank. These signals are first passed by
digitizing comparators. Digitized signals are processed by a
phase detector with a strong low pass filter characteristics to
get average phase difference. The Phase Detector output is
inversely proportional to the phase difference between the two
inputs. The 90° phase shift results in VSP_A/2 output voltage,
in case both inputs are in phase output voltage is VSP_A in case
they are in opposite phase output voltage is zero. During
execution of direct command Measure Phase this output is
multiplexed to A/D Converter input (A/D Converter is in relative
mode during execution of command Measure Phase). Since the
A/D converter range is from 1/6 VSP_A to 5/6 VSP_A the actual
phase detector range is from 30º to 150º. Figures below depict
the two inputs and output of phase detector in case of 90º and
135º phase shift.
Figure 17:
Phase Detector Inputs and Output in case of 90º Phase Shift
VSP
VSP
VSP
0
VSP/2



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