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| 型号： | RI-RFM-006A-00 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | TIRIS RF-Module IC for Automotive |
| 中文描述： | 提里斯射频集成电路模块汽车 |
| 文件页数： | 17/20页 |
| 文件大小： | 148K |
| 代理商： | RI-RFM-006A-00 |
Rev. 3.5
RI-RFM-006A
TIRIS
RF-Module IC for Automotive
Page 16 of 19
!
Typical Antenna Circuit Configuration
The antenna circuit consisting of L and C illustrated earlier in this manual (see the section describing
“Applied Circuit Configuration – Example”) is designed to work as an LC serial resonance circuit in
which impedance drops in the presence of resonance frequencies during sending operation, and as an LC
parallel resonance circuit in which impedance increases in the presence of resonance frequencies during
receiving operation. The relationship between L and C incorporated in the resonance circuit can be
defined according to the following expression. Each value is calculated using this expression:
f
LC
(
)
134.2KHz
=
1
2
π
The higher the Q value (quality factor) is, the higher transmission power the antenna L obtains and also
the higher the receiving gain becomes, thus allowing the system to have a greater available data
communication distance. If, however, at switch-over from power transmission mode to the receiving
mode, damping of the power transmission signal would not be completed before the remote
TIRIS
transponder sends its ID code back to the IC, the signals sent from the transponder could not be received
properly. And the higher the Q value is, the longer the decay time of this power transmission signal will
be. It has been revealed by experimental testing that an antenna with its maximum Q value of around 30 is
usable in the circuit as is as illustrated in the “Applied Circuit Configuration – Example” section. If it is
desired to use an antenna having a higher Q value, some measures must be devised and added to this
circuit.
Additionally, the characteristics and efficiency of the resonance circuit used here greatly depend not only
on the antenna L but also on the capacitor C and the MOSFETs which drive them. Therefore, the
application of the lowest possible impedance at the frequency f(134.2 kHz) to them will permit a higher
transmission power, and as a result, it will allow the system to have a greater available data
communication distance with the remote transponder.
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