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| 型號(hào)： | HTCM400 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | HITAG core module hardware |
| 中文描述： | 此外，HITAG核心模塊的硬件 |
| 文件頁(yè)數(shù)： | 17/24頁(yè) |
| 文件大小： | 112K |
| 代理商： | HTCM400 |
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2001 Oct 04
17
Philips Semiconductors
Product specification
HITAG core module hardware
HTCM400
11.5
Antenna tuning
You have to tune the antenna in its final form with the connecting cable. You must not make any changes to the antenna
coil or the connecting cable after you finished tuning because mechanical changes influence the electrical values and
the antenna is detuned again.
handbook, full pagewidth
47
R3
1
MGW274
f = 125 kHz
R2
R1
L
Cs
Vo
VR
Va
Fig.14 Tuning the antenna.
A sinus signal of 125 kHz is fed to the antenna using a
frequencygenerator.Youmeasurethevoltages V
a
and V
R
with an oscilloscope. Then you change the frequency until
V
a
and V
R
are in phase. If the resonance frequency now is
too high, you have to increase C
S
. If it is too low, you have
to decrease C
S
.
The aim is to get a resonance frequency of 125 kHz
using C
S
.
The resonant frequency has to be in the range of
125
±
4 kHz.
11.6
Determining the serial resistance of the
antenna
Use an oscilloscope to measure V
a
and V
R
at a frequency
of 125 kHz. You can calculate the serial resistance R
S
of
the antenna with the following formulas:
and
11.7
Checking the antenna voltage V
L
Before connecting the antenna to the read and write
device in Fig.15, you must carry out a check calculation of
the input level of the read and write device according to the
next formulas in order to prevent damage.
I
a
V
R
R3
-------
=
R
s
V
a
I
a
------
=
handbook, full pagewidth
CORE
MODULE
R2
R1
TX1
RX
AGND
L
Cs
Re
Ia
Vo
VL
MGW276
Fig.15 Calculation check of the input level.
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